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11-365 ordering information rf micro devices, inc. 7628 thorndike road greensboro, nc 27409, usa tel (336) 664 1233 fax (336) 664 0454 http://www.rfmd.com functional block diagram product description features optimum technology matching? applied si bjt si bi-cmos ingap/hbt gaas hbt sige hbt gan hemt gaas mesfet si cmos sige bi-cmos gaas phemt lb rf in tx en vramp hb rf in rx 1 rx 2 rx 3 rx 4 antenna b3 vsense b1 b2 vbatt 2 3 4 5 9 13 6 14 15 16 21 7 8 1 fully integrated power control circuit and switch decoder gsm gaas die dcs/pcs gaas die phemt switch RF7115 quad-band gsm850/gsm900/dcs/pcs transmit module the RF7115 is a high-power, high-efficiency transmit module containing rfmd?s power star ? integrated power control, integrated phemt front end antenna switch and harmonic filtering functiona lity. all of which combine to provide for best in class harmonic emission control and rx and tx insertion loss. th e device is self-contained with 50 input and output terminals with no matching components required. the integrated power control func- tion based on rfmd?s patented power star ? control is incorporated, eliminating the need for directional couplers, detector diodes, power control asic?s, and other power control circuitry; this allo ws the module to be driven directly from the dac output. the device is designed for use as the final portion of the transmit chain in gsm850, egsm900, dcs and pcs gmsk and eliminates the need for pa to antenna switch module matching. on-board power control provides over 70db control range. the inte- grated antenna switch allows true quad band tx and rx functionality. built -in current limiter option may be utilized to minimize power variation in mismatch condition. ? reduced solution size integrating antenna switch and harmonic filtering to decrease time to market ? package 7x8x1.2mm ? iec 61000-4-2 compliant ? in/output matched to 50 ? dc block on antenna port ? gsm850/900 p out =33.5dbm ?dcs/pcs p out =30.5dbm ? new current limiter applications ? gsm850/egsm900/dcs/ pcs products ? gprs class 12 capable ? power star? module ? 3v quad-band handsets ? portable battery-powered equipment RF7115 quad-band gsm850/gsm900/dcs/pcs trans- mit module RF7115sb power amp module 5-piece sample pack RF7115pcba-41x fully assembled evaluation board 0 rev a0 060808 9 9 9 rohs compliant & pb-free product
11-366 RF7115 rev a0 060808 absolute maximum ratings parameter rating unit supply voltage -0.3 to +6.0 v power control voltage (v ramp ) -0.3 to +1.8 v input rf power +10 dbm max duty cycle 50 % output load vswr 20:1 operating case temperature -20 to +85 c storage temperature -55 to +150 c parameter specification unit condition min. typ. max. overall power control v ramp power control ?on? 1.5 v max. p out , voltage supplied to the input power control ?off? 0.2 0.25 v min. p out , voltage supplied to the input v ramp input capacitance 15 20 pf dc to 2mhz v ramp input current 10 av ramp =v ramp max turn on/off time 2 us v ramp =0v to v ramp max power control range 50 db v ramp =0.25v to v ramp max v ramp p out bw 2.0 2.5 mhz overall power supply power supply voltage 3.5 v specifications 3.0 5.5 v nominal operating limits power supply current 1 20 ap in <-30dbm, tx enable=low, v ramp =0v, temp=-20c to +85c, v batt =5.5v overall control signals b1, b2, b3 ?low? 0 0 0.5 v b1, b2, b3 ?high? 1.25 2.0 3.0 v b1, b2, b3 ?high current? 1 2 ua tx enable ?low? 0 0 0.5 tx enable ?high? 1.25 2.0 3.0 v tx enable ?high current? 1 2 ua caution! esd sensitive device. rf micro devices believes the furnished information is correct and accurate at the time of this printing. rohs marking based on eudirective2002/95/ec (at time of this printing). however, rf micro devices reserves the right to make changes to its products without notice. rf micro devices does not assume responsibility for the use of the described product(s).
11-367 RF7115 rev a0 060808 parameter specification unit condition min. typ. max. gsm850 mode temp=+25c, v batt =3.5v, v ramp max , p in =4dbm, 25% duty cycle, pulse width=1154 s operating frequency range 824 849 mhz maximum output power 33.0 34.0 dbm 25% duty cycle, pulse width 1154us 32.8 dbm 50% duty cycle, pulse width 2308us 31.0 dbm temp=+85c, v batt =3.0v, v ramp =v ramp max @ v batt =3.0v total efficiency 37 42 % at p out max , v batt =3.5v input power range 2 4 6 dbm full output power guaranteed at minimum drive level output noise power -88 -83 dbm 869mhz to 894mhz, rbw=100khz, p out > +5dbm <-100 -87 dbm 1930mhz to 1990mhz, rbw=100khz, p out > +5dbm forward isolation 1 -50 -41 dbm txenable=low, p in =+6dbm, v ramp =0.25v, b1=b2=low, b3=high forward isolation 2 -29 -15 dbm txenable=high, p in =+6dbm, v ramp =0.25v, b1=b2=low, b3=high all harmonics up to 12.75ghz -40 -35 dbm over all power levels (5dbm to 33dbm) all non-harmonic spurious -36 dbm over all power levels (5dbm to 33dbm) input vswr 2.5:1 over all power levels (5dbm to 33dbm) output load vswr stability 10:1 spurious<-36dbm, set v ramp where p out < 33.0dbm into 50 load output load vswr ruggedness 20:1 set v ramp where p out < 33.0dbm into 50 load. no damage or permanent degradation to part. input and output impedance 50 note: v ramp max =3/8*v batt +0.15< 1.5v
11-368 RF7115 rev a0 060808 parameter specification unit condition min. typ. max. gsm900 mode temp=+25c, v batt =3.5v, v ramp max , p in =4dbm, 25% duty cycle, pulse width=1154 s operating frequency range 880 915 mhz maximum output power 33.0 33.5 dbm 25% duty cycle, pulse width 1154us 32.8 dbm 50% duty cycle, pulse width 2308us 31.0 dbm temp=+85c, v batt =3.0v, v ramp =v ramp max total efficiency 35 40 % at p out max , v batt =3.5v input power range 2 4 6 dbm full output power guaranteed at minimum drive level output noise power -85 -79 dbm 925mhz to 935mhz, rbw=100khz, p out > +5dbm -89 -83 dbm 935mhz to 960mhz, rbw=100khz, p out > +5dbm <-100 -87 dbm 1805mhz to 1880mhz, rbw=100khz, p out > +5dbm forward isolation 1 -60 -41 dbm txenable=low, p in =+6dbm, v ramp =0.25v, b1=high, b2=low, b3=high forward isolation 2 -27 -15 dbm txenable=high, p in =+6dbm, v ramp =0.25v, b1=high, b2=low, b3=high all harmonics up to 12.75ghz -40 -35 dbm over all power levels (5dbm to 33dbm) all non-harmonic spurious -36 dbm over all power levels (5dbm to 33dbm) input vswr 2.5:1 over all power levels (5dbm to 33dbm) output load vswr stability 10:1 spurious<-36dbm, set v ramp where p out < 33.0dbm into 50 load output load vswr ruggedness 20:1 set v ramp where p out < 33.0dbm into 50 load input and output impedance 50 note: v ramp max =3/8*v batt +0.15< 1.5v
11-369 RF7115 rev a0 060808 parameter specification unit condition min. typ. max. dcs1800 mode temp=+25c, v batt =3.5v, v ramp max , p in =4dbm, 25% duty cycle, pulse width=1154 s operating frequency range 1710 1785 mhz maximum output power 30.0 31.0 dbm 25% duty cycle, pulse width 1154us 29.8 dbm 50% duty cycle, pulse width 2308us 28.0 dbm temp=+85c, v batt =3.0v, v ramp =v ramp max total efficiency 32 37 % at p out max , v batt =3.5v input power range 2 4 6 dbm full output power guaranteed at minimum drive level output noise power -92 -87 dbm 1805mhz to 1880mhz, rbw=100khz, p out > 0dbm <-100 -87 dbm 925mhz to 935mhz, rbw=100khz, p out > 0dbm <-100 -84 dbm 935mhz to 960mhz, rbw=100khz, p out > 0dbm forward isolation 1 -60 -53 dbm txenable=low, p in =+6dbm, v ramp =0.25v, b1=low, b2=high, b3=high forward isolation 2 -20 -15 dbm txenable=high, p in =+6dbm, v ramp =0.25v, b1=low, b2=high, b3=high all harmonics up to 12.75ghz -40 -35 dbm over all power levels (0dbm to 30dbm) all non-harmonic spurious -36 dbm over all power levels (0dbm to 30dbm) input vswr 2.5:1 over all power levels (0dbm to 30dbm) output load vswr stability 10:1 spurious<-36dbm, set v ramp where p out < 30.0dbm into 50 load output load vswr ruggedness 20:1 set v ramp where p out < 30.0dbm into 50 load. no damage or permanent degradation to part. input and output impedance 50 note: v ramp max =3/8*v batt +0.15< 1.5v
11-370 RF7115 rev a0 060808 parameter specification unit condition min. typ. max. pcs1900 mode temp=+25c, v batt =3.5v, v ramp max , p in =4dbm, 25% duty cycle, pulse width=1154 s operating frequency range 1850 1910 mhz maximum output power 30.0 31.0 dbm 25% duty cycle, pulse width 1154us 29.8 dbm 50% duty cycle, pulse width 2308us 28.0 dbm temp=+85c, v batt =3.0v, v ramp =v ramp max total efficiency 32 37 % at p out max , v batt =3.5v input power range 2 4 6 dbm full output power guaranteed at minimum drive level output noise power -92 -87 dbm 1930mhz to 1990mhz, rbw=100khz, p out > 0dbm <-100 -87 dbm 869mhz to 894mhz, rbw=100khz, p out > 0dbm forward isolation 1 -60 -53 dbm txenable=low, p in =+6dbm, v ramp =0.25v, b1=b2=b3=high forward isolation 2 -20 -15 dbm txenable=high, p in =+6dbm, v ramp =0.25v, b1=b2=b3=high all harmonics up to 12.75ghz -40 -35 dbm over all power levels (0dbm to 30dbm) all non-harmonic spurious -36 dbm over all power levels (0dbm to 30dbm) input vswr 2.5:1 over all power levels (0dbm to 30dbm) output load vswr stability 10:1 spurious<-36dbm, set v ramp where p out < 30.0dbm into 50 load output load vswr ruggedness 20:1 set v ramp where p out < 30.0dbm into 50 load. no damage or permanent degradation to part. input and output impedance 50 note: v ramp max =3/8*v batt +0.15< 1.5v
11-371 RF7115 rev a0 060808 parameter specification unit condition min. typ. max. rx-section nominal conditions insertion loss, ant-rx1-4 temp=+25c, v cc =3.5v freq 869mhz to 894mhz 1.0 1.3 db tx=low, b1=low, b2=low, b3=high freq 925mhz to 960mhz 1.0 1.3 db tx=low, b1=high, b2=low, b3=x freq 1805mhz to 1880mhz 1.3 1.6 db tx=low, b1=low, b2=high, b3=x freq 1930mhz to 1990mhz 1.3 1.6 db tx=low, b1=high, b2=high, b3=x insertion loss, ant-rx1-4 extreme conditions freq 869mhz to 894mhz 1.4 1.7 db temp=-20c, +25c, and +85c, v cc =3.0v, 3.5v, and 5.5v freq 925mhz to 960mhz 1.4 1.7 db freq 1805mhz to 1880mhz 1.7 2.0 db freq 1930mhz to 1990mhz 1.7 2.0 db ripple, ant-rx1-4 nominal conditions freq 869mhz to 894mhz 0.02 0.20 db temp=+25c, v cc =3.5v freq 925mhz to 960mhz 0.02 0.20 db freq 1805mhz to 1880mhz 0.06 0.20 db freq 1930mhz to 1990mhz 0.06 0.20 db return loss, ant-rx1-2 nominal conditions freq 869mhz to 894mhz -22 -15 db temp=+25c, v cc =3.5v freq 925mhz to 960mhz -22 -15 db return loss, ant-rx3-4 freq 1805mhz to 1880mhz -14 -12 db freq 1930mhz to 1990mhz -14 -12 db
11-372 RF7115 rev a0 060808 parameter specification unit condition min. typ. max. tx-section isolation, ant-rx1-4 freq 824mhz to 849mhz rx1 -0.75 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx2 -0.75 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx3 1.75 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx4 1.75 10 dbm temp=+25c, v cc =3.5v, p out =33dbm freq 880mhz to 915mhz rx1 0.25 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx2 0.25 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx3 2.50 10 dbm temp=+25c, v cc =3.5v, p out =33dbm rx4 2.50 10 dbm temp=+25c, v cc =3.5v, p out =33dbm freq 1710mhz to 1785mhz rx1 8.50 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx2 5.00 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx3 -5.00 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx4 5.50 10 dbm temp=+25c, v cc =3.5v, p out =30dbm freq 1850mhz to 1910mhz rx1 9.25 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx2 6.00 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx3 -5.50 10 dbm temp=+25c, v cc =3.5v, p out =30dbm rx4 6.00 10 dbm temp=+25c, v cc =3.5v, p out =30dbm note: isolation specification max limit set to ensure at least 20db of isolation. calculation example: p out @a nt -p out @rxport, lo band isolation=33-10=23db, hi band isolation=30-10=20db. additional rx3 circuitry ensures specification for hi band tx-rx overlapping frequencies. lo band rx-rx overlapping frequencies has sufficient margin.
11-373 RF7115 rev a0 060808 pin function description interface schematic 1 vsense can provide two purposes: 1. the current limiter can be set by adding a resistor to determine the set point. when open, the current limiter feature is fully engaged and shorter the current limiter is disabled. 2. a voltage proportional to the pa current can be detected and used as feedback to the baseband. see application note for further details. 2 gsm850/ gsm900 in rf input to the gsm850/gsm900 band. this is a 50 input. 3b1 control pin that together with b2 and b3 selects band of operation. 4b2 control pin that together with b1 and b3 selects band of operation. 5vbatt power supply for the module. this should be connected to the battery terminal using as wide a trace as possible. 6b3 control pin that together with b1 and b2 selects band of operation. 7 tx enable this signal enables the pa module for operation with a logic high. the switch is put in tx mode determined by b1, b2, and b3. 8 vramp vramp ramping signal from dac. a simple rc filter may need to be connected between the dac output and the v ramp input depending on the baseband selected. 9 dcs/pcs in dcs/pcs in rf input to the dcs/pcs band. this is a 50 input. 10 gnd 11 gnd 12 gnd 13 rx 1 rx 1 port of antenna switch. this is a 50 output. note that there will be a dc voltage present equal to v batt -0.5v. 14 rx 2 rx 2 port of antenna switch. this is a 50 output. note that there will be a dc voltage present equal to v batt -0.5v. 15 rx 3 rx 3 port of antenna switch. this is a 50 output. note that there will be a dc voltage present equal to v batt -0.5v. additional logic provided to improve isolation at 2f 0 of gsm band. 16 rx 4 rx 4 port of antenna switch. this is a 50 output. note that there will be a dc voltage present equal to v batt -0.5v. tx enable tx on + - hb rf in rx850 rx900 rx1800 rx1900
11-374 RF7115 rev a0 060808 pin function description interface schematic 17 gnd 18 gnd 19 gnd 20 gnd 21 ant antenna port of antenna switch. this is a 50 output. provides dc blocking as well as esd protection. 22 gnd 23 gnd pkg base gnd antenna
11-375 RF7115 rev a0 060808 theory of operation product description the RF7115 is a high-power, high-efficiency, transmit module (txm) with fully-integrated power control functionality, har- monic filtering, band selectivity, and tx/rx switching. the txm is self-contained, with 50 i/o terminals with four rx ports allowing true quad band operation. the power control function eliminates all power control circuitry, including direc- tional couplers, diod e detectors, and power co ntrol asic?s, etc. the power control capability provides 50db continuous control range, and 70db total control range, using a dac-compatible, analog voltage input. the tx enable feature pro- vides for pa activation (tx mode) or rx mode/stand-by. internal switching provides a low-loss, low-distortion path from the antenna port to the tx path (or rx port), while maintaining proper isolation. integrated filtering provides etsi com- pliant harmonic suppression at the antenna port even under high mismatch conditions, which is important as modern antennas today often present a load that significantly deviates from nominal impedance. overview the RF7115 is a true quad-band gsm850, egsm900, dcs1800, and pcs1900 power amplifier module with fully inte- grated power control functionality, harmonic filtering, band selectivity and tx/r x switching. this simplifies the phone design by eliminating the need for the complicated control loop design, harmonic filters, tx/rx switch and possible matching components between these. the power control loop can be driven directly from the dac output in the base- band circuit. the module has 4 rx ports for gsm850. egsm90 0, dcs1800, and pcs1900 bands of operation. for opti- mum performance, it is best to use rx1 and rx2 for low band, and rx3 and rx4 for high band operation. best forward isolation can be achieved in these states during the off mode as well. to control the mode of operation, there are four logic control signals; tx enable, b1, b2, and b3. refer to truth table below for mode of operations. if control signals are limited, eliminate the use of the standby mode and b3 may rema in in the high state for all modes of operation. by also changing the don?t care state (x) of b1 allows mini mum control logic switching between on and off states. module control and antenna switch logic tx_en b1 b2 b3 tx module mode 0 0 0 0 stand by mode 000 1 rx 1 010 x rx 2 001 x rx 3 011 x rx 4 1 x 0 1 tx low band (gsm850/egsm900) 1 x 1 1 tx high band (dcs1800/pcs1900)
11-376 RF7115 rev a0 060808 power control theory of operation most power control systems in gsm sense either forward power or collector/drain current. the RF7115 uses rfmd?s power star r collector voltage control instead of a power or current detector. a high-speed control loop is incorporated to regulate the collector voltage of the ampl ifier while the stages are held at a constant bias. the basic circuit is shown in the following diagram. by regulating the power, the stages are held in saturation across all power levels. as the required output power is decreased from full power down to -15dbm, the collector voltage is also decreased. this regulation of output power is demonstrated in equation 1 where the relationship between collector voltage and output power is shown. although load impedance affects output power, supply fluctuations are the dominate mode of power variations. with the RF7115 regu- lating, there are several key factors to consider in the implementation of a transmitter solution for a mobile phone. some of them are: (eq. 1) ? effective efficiency ( eff ) ? current draw and system efficiency ? power variation due to supply voltage ? power variation due to frequency ? power variation due to temperature ? input impedance variation ? noise power ? loop stability ? loop bandwidth variations across power levels ? burst timing and transient spectrum trade offs ? harmonics ?post pa loss ? insertion loss in receive ports ? tx power leakage into the rx ports ? performance during vswr ? time needed to implement the solution ? needed board area for the solution rf in rf out h(s) vramp tx enable vbatt p dbm 10 2 v cc v sat ? ? () 2 8 r load 10 3 ? ?? ------------------------------------------- log ? =
11-377 RF7115 rev a0 060808 talk time and power management are key concerns in transmitter design since the power amplifier is the leading current consumer in a mobile terminal. considering only the power amplifier's efficiency does not provide a true picture for the total system efficiency. it is impor tant to consider effective efficiency which is represented by eff . ( eff considers the loss between the pa and antenna and is a more accurate measurement to determine how much current will be drawn in the application). eff is defined by the following relationship (equation 2): (eq. 2) where p pa is the output power from the pa, p loss the insertion loss and p in the input power to the pa. the RF7115 improves the effective efficiency by minimizing the p loss term in the equation. an asm may have a typical loss of 1.2db in lb and 1.4db in high band. to be added to this is trace losses and mismatch losses. a post pa loss of 1.5db in lb and 1.8db in hb is common. with the integration of a low loss phemt switch and matching network in the same module, higher system efficiency can be achieved. output power does not vary due to supply voltage under normal operating conditions if v ramp is sufficient ly lower than v batt . by regulating the collector voltage to the pa the voltag e sensitivity is essentially eliminated. this covers most cases where the pa will be operated. however, as the battery discharges and approach es its lower power range the maximum output power from the pa will also drop slightly. in this case, it is important to also decrease v ramp to prevent the power control from inducing switching transients. these tr ansients occur as a result of the control loop slowing down and not regulating power in accordance with v ramp . the relationship for v rampmax based on v batt is expressed in equation 3. (eq. 3) the components following the power amplifier often have insertion loss variation with respect to frequency. usually, there is some length of microstrip that follows the power amplifier. there is also a frequency response found in directional cou- plers due to variation in the coupling factor over frequency, as well as the sensitivity of the detector diode. since the RF7115 does not use a directional coupler with a diode dete ctor, these variations do not occur. also the tx/rx switch with low pass filters that usually follows the pa may contribute to frequency variation. the tx/rx switch incorporated in the RF7115 is very broadband and does not contribute to frequency roll off. traditionally working with pa modules, some matching network is necessary between the pa output and the input of the tx/rx switch in order to get best possible performance. this work no longer has to be carried out, as this matching network is included in the RF7115. noise power in pa's where output power is controlled by changing the bias voltage is often a problem when backing off of output power. the reason is that the gain is changed in all stages and according to the noise formula (equation 4), (eq. 4) the noise figure depends on noise factor and gain in all stages. because the bias point of the RF7115 is kept constant the gain in the first stage is always high and the overall noise power is not increased when decreasing output power. power control loop stability ofte n presents many challe nges to transmitter design. desi gning a proper power control loop involves trade-offs affecting stability , transient spectrum and burst timing. eff 10 p pa p loss + 10 ------------------------------ 10 p in 10 ------- - ? v bat i bat 10 ?? ------------------------------------------------ - = v rampmax 3 8 -- - v batt 0.15 1.5 v + = f tot f 1 f 21 ? g 1 --------------- - f 31 ? g 1 g 2 ? ------------------- ++ =
11-378 RF7115 rev a0 060808 the RF7115 loop bandwidth is determined by internal bandwidth and does not change with respect to power levels. this makes it easier to maintain loop stabilit y with a high bandwidth loop since the bias vo ltage and collector voltage do not vary. an often overlooked proble m in pa control loops is that a delay not only decr eases loop st ability it also affects the burst timing when, for instance the input power from the vc o decreases (or increases) with respect to temperature or supply voltage. the burst timing then appears to shift to t he right especially at low power levels. the RF7115 is insensi- tive to a change in input power and the burst timing is constant and requires no software compensation. switching tran- sients occur when the up and down ramp of the burst is not smooth enough or suddenly changes shape. if the control slope of a pa has an inflection point within the output power rang e or if the slope is simply too steep it is difficult to pre- vent switching transients. co ntrolling the output power by changing the collect or voltage is as earlier described based on the physical relationship between voltage swing and output po wer. furthermore all stages are kept constantly biased so inflexion points are nonexistent. harmonics are natural products of high efficiency power amp lifier design. an ideal class ?e? saturated power amplifier will produce a perfect square wave. looki ng at the fourier transform of a square wave reveals high harmonic content. although this is common to all power amplifiers, there are ot her factors that contribute to conducted harmonic content as well. with most power control methods a peak power diode detector is used to rectify and sense forward power. through the rectification process there is additional squaring of the waveform resulting in higher harmonics. the RF7115 address this by eliminating the need for the detector diode. therefore the harmonics coming out of the pa should represent the maximum power of the harmonics throughout the transmit chain. this is based upon proper harmonic termination of the transmit port. performance under vswr often overlooked when designing transmitters is the fact that they normally operate under mismatch conditions while they are designed to operate only under perfect 50 ohm loads. this means that in the real application, performance is degraded. this performance degradation may include reduction in output power, increased harmonic levels, increased transient spectrum and catastrophic failures, breakdown. traditionally designers have verified that the pa does not break during mismatch and this is all verification that has been carried out during mismatch. modern antennas in handsets often present a load that significantly deviates from nominal impedance. a vswr of 5:1 in not uncommon. in order not to disturb other phones in the same and close by cells, it is im portant that the etsi specifications for transient spectrum, bust timing and spurious emission are fu lfilled even during mismatch conditions. the RF7115 is designed to maintain its performance even under high antenna mismatch conditions. if power variation into a mismatch condition presents a proble m, a current limiting option ma ybe utilized. the current lim- iter can be set by adding a resistor to determine the set point. when open, the current limiter feature is fully engaged and shorter the current limiter is disabled. please refer to application note for further details. unlike a current controlled power control loop, the voltage controlled loop is almost impossible to force out of lock. for the current controlled loop this easily happens as the current to the power amplifier that the controller tries to keep con- stant can not be maintained during some phase angles. if the output stage of the power amplifier faces a high imped- ance due to mismatch at the antenna, then the last stage simply cannot sink the current it does in a 50 load condition. as the loop detects the lower current, the control voltage to the power amplifier increases in an attempt to keep the cur- rent constant. as it is impossible to reach the desired current, the control voltage for the power amplifier rails and the error is accumulated in the integrator in the control loop. when the reference value is lowered when the down ramp starts, the integrator still contains the accumulated error and the co ntrol voltage to the power amplifier does not track the reference signal. this means that the burst will be too long and that when the error finally re aches zero in the integrator, the control voltage to the powe r amplifier sudd enly decrease s and this will contribute to increased levels of transient spectrum at the down ramp. the power star methodology is superior to the traditional current cont rol method; it allo ws the transient spectrum in nor- mal operation to be in the order of -35dbm to -40dbm but also both transient spectrum and the power versus time per- formance is unaffected even with severe mismatch. in addition to this, the harmonics of the RF7115 is designed to be within etsi limits for usage with realistic antennas.
11-379 RF7115 rev a0 060808 tx/rx switch the phemt switch integrated in the RF7115 allows for a low loss connection between the antenna port and the four rx ports. the insertion loss in the tx and rx paths is lower than the loss for a traditional pin-diode switch solution, which means lower current consumption in tx mode and better receiver sensitivity.
11-380 RF7115 rev a0 060808 package drawing 7.000 0.10 8.000 0.10 1 7.800 typ 4.885 typ 4.150 3.350 typ 2.625 typ 1.750 typ 0.950 typ 0.200 typ 2.550 typ 0.150 typ 0.000 5.550 5.685 6.315 6.485 7.350 typ 0.000 0.100 typ 3.050 typ 5.300 6.100 typ 5.600 typ 6.900 typ 0.650 typ 2.250 typ 0.950 typ 0.950 2.325 typ 3.050 typ 3.850 typ 4.650 typ 5.250 typ 5.450 typ 6.250 typ 7.050 typ 1 6.000 typ 5.535 typ 5.365 0.600 typ 1.14 0.040 0.665 typ 1.000 typ 3.350 typ 6.400 typ 1.450 typ 5.750 typ 7.115 7.285 typ 7.850 typ dimensions in mm. shaded areas represent pin 1. package style: module (7mmx8mm)
11-381 RF7115 rev a0 060808 pin out 2 3 22 1 gnd 23 4 5 6 7 8 9 10 11 gnd 23 gnd 23 gnd 23 gnd 23 gnd 23 20 19 21 18 17 16 15 14 13 12 vsense b1 lb_rfin b2 vbat b3 tx_en vramp hb_rfin gnd gnd gnd ant gnd gnd gnd gnd rx4 rx3 rx2 rx1 gnd
11-382 RF7115 rev a0 060808 application schematic 2 3 4 5 9 13 6 14 15 16 21 7 8 1 fully integrated power control circuit and switch decoder phemt switch 10 gnd: internally connected to hb q2 de-coupling capacitor requires external gnd 11 12 gnd: connected to backside gnd 16 - 20 22 lb rf in 50 ? strip vsense customer option. see application note. b1 b2 vbatt 4.7 uf b3 txen optional depending on bb selection vramp 50 ? strip hb rfin 33 pf 33 pf 33 pf 33 pf rx1 rx2 rx3 rx4 50 ? strip
11-383 RF7115 rev a0 060808 evaluation board schematic (download bill of materials from www.rfmd.com.) 1 3 4 5 9 6 7 8 2 10 11 22 20 19 18 14 17 16 15 21 13 12 23 j2 ant c1 33 pf j3 rx4 c2 33 pf j5 rx3 c4 33 pf j7 rx2 c5 33 pf j8 rx1 j4 lb rfin b1 b2 c3* dni c7* dni + c6 4.7 uf + vbatt b3 j9 txen txen r5 0 c12* dni j10 vramp vramp j6 hb rfin u1 RF7115 p1 1 2 3 4 5 6 7 8 p1-1 p1-2 p1-3 p1-4 p1-5 p1-7 p1-8 r6 0 vramp lxen gnd r4 10 k r3 10 k vout1 vout2 error1 error2 vin sd1 sd2 gnd u2 8 7 6 5 1 2 3 4 c10 10 uf c11 10 uf s1 8 7 6 5 1 2 3 4 sw-dip4 r2 10 k r1 10 k b1 b2 b3 1 p3 gnd 1 p2 p2-1
11-384 RF7115 rev a0 060808 evaluation board layout board size 2.0? x 2.0? board thickness 0.052?, board material fr-4, multi-layer assembly top inner 1 inner 2
11-385 RF7115 rev a0 060808 inner 3 inner 4 back
11-386 RF7115 rev a0 060808 pcb design requirements pcb surface finish the pcb surface finish used for rfmd's qualification process is electroless nickel, immersion gold. typical thickness is 3 inch to 8 inch gold over 180 inch nickel. pcb land pattern recommendation pcb land patterns for rfmd components are based on ipc-7351 standards and rfmd empirical data. the pad pattern shown has been developed and tested for optimized assembly at rfmd. the pcb land pattern has been developed to accommodate lead and package tolerances. since surface mount processes vary from company to company, careful process development is recommended. pcb metal land and solder mask pattern dimensions in mm. a = 0.65 sq. typ. b = 2.65 x 2.62 c = 2.05 x 2.25 d = 2.05 x 2.62 e = 2.05 x 2.12 solder mask pattern a c d b a a e a a a a a a a a a a a a a a a a a a a 0.80 typ. 1.28 typ. 3.30 typ. 4.62 typ. 6.30 typ. 0.00 0.00 0.49 0.80 typ. 1.60 typ. 2.40 typ. 3.20 typ. 4.00 typ. 4.80 typ. 5.60 typ. 6.40 typ. 7.20 typ. 6.73 0.86 1.92 typ. 6.27 3.53 typ. 5.15 typ. 7.40 typ. a = 0.50 sq. typ. metal land pattern a a a a a a a a a a a a a a a a 0.42 typ. 5.87 typ. 7.45 typ. 6.81 3.75 0.25 6.55 typ. 0.00 0.80 1.22 0.00 0.42 5.60 6.40 4.80 4.00 0.80 typ. 1.60 typ. 2.40 typ. 3.20 typ.

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