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| TA0016 TA0016 End RFIC RF2403: European Applications for RF2403 Cordless Telephone Front A front end RFIC for cordless telephone applications has been developed for use in the 902MHz to 928MHz ISM (Industrial-Scientific-Medical) band in the United States under Part 15 of the FCC Rules. Potential applications for this RFIC in this frequency band include cordless telephones, wireless LANs, wireless security systems and point-of-sale (POS) terminals. This RFIC, the RF2403, consists of a single-stage LNA, a two-stage PA with 21dBm of output power and a transmit/receive switch. The RFIC is built using a commercial GaAs MESFET process, and is packaged in a SOP-16 narrowbody surface-mount package. The circuit operates with a +5.0V supply, and has separate enable lines which control the bias to the transmit and receive functions. All bias and control signals operate with voltages which lie between ground potential and VDD. With both enable lines at logic low, the circuit is in a "power down" mode in which it draws approximately 1.0mA of leakage current from the VDD supply. Some external passive components are required, primarily for DC blocking and RF bypassing functions. The PA output impedance matching circuitry, consisting of a pinetwork, is realized using external passive components in order to both conserve die area and to reduce parasitic losses. This same RFIC has been evaluated for use in 433MHz European applications, and has been found to have very good RF performance there. Although no changes have been made to the RFIC itself, several changes to the application circuit are necessary for operation at 433MHz. Table 1 shows the component values for both versions of the RF2403 application circuit. The two application schematics are shown, for 433MHz operation and for 915MHz operation, in Figures 1 and 2, respectively. The resulting RF performance for these circuits is shown in Table 2. The I/O port return losses are somewhat degraded at 433MHz, primarily due to the excess reactance of the on-chip DC blocking capacitors in the RFIC. The RF2403 does have comparable gain, output power and linearity at 433MHz with respect to its performance at 915MHz. RF Specification LNA Gain LNA 1 Measured Performance (All Typical) @VDD =5.0V 433MHz Circuit 17dB 2.4dB +6.0dBm 6.0dB 15dB 28dB 19.0dBm 11dB 11.5dB 17.5dBm 915MHz Circuit 16dB 2.7dB +6.0dBm 9.0dB 13dB 28dB 21.0dBm 17dB 10.5dB 16.7dBm NF1 LNA P1dB1 RX IRL, ANT port1 LNA ORL PA Small Signal Gain1 PA P1dB1 PA IRL PA ORL, ANT port1 PA Two-tone POUT1,2 @ -25dBc IMD3 13 TECHNICAL NOTES AND ARTICLES Table 2. RF2403 measured performance, using the two application schematics Note 1: Performance is measured through the monolithic T/R switch Note 2: f1 =432.5MHz, f2 =433.5MHz, or, f1 =914.5MHz, f2 =915.5MHz Copyright 1997-2000 RF Micro Devices, Inc. 13-85 TA0016 P1 P1-1 1 2 L1 47 nH P1-1 C2 0.1 F C1 220 pF L2 Jumper C3 N/A 50 strip 3 C5 100 pF 4 5 6 7 8 C7 220 pF 14 13 12 11 10 9 R1 150 P2-1 C9 22 pF C4 100 pF 1 2 ANT J1 16 15 C10 0.1 F L3 33 nH NC 3 VDD GND P2-3 P2-1 P2 1 2 3 TXPC GND RXPC L4 10 nH C11 1.5 pF LNA OUT J2 P2-3 P1-1 50 strip C6 100 pF C8 100 pF 50 strip PA IN J3 Figure 1. RF2403 Application Circuit for 433MHz European Applications P1 P1-1 1 2 L1 22 nH P1-1 C2 0.1 F C1 100 pF L2 3.3 nH NC 3 VDD GND P2-3 P2-1 P2 1 2 3 TXPC GND RXPC L4 3.3 nH C11 0.6 pF 1 2 16 15 14 13 12 11 10 9 P2-1 C9 12 pF C10 0.1 F L3 33 nH 13 TECHNICAL NOTES AND ARTICLES ANT J1 C3 3 pF 50 strip C4 47 pF 3 C5 47 pF 4 5 6 7 8 C7 100 pF LNA OUT J2 P2-3 P1-1 50 strip C6 47 pF C8 47 pF 50 strip PA IN J3 Figure 2. RF2403 Application Circuit for 915MHz ISM Applications 13-86 Copyright 1997-2000 RF Micro Devices, Inc. TA0016 Value (0805 size, unless noted otherwise) 433MHz Circuit 915MHz Circuit 220pF 0.1F Omit 100pF 100pF 100pF 220pF 100pF 22pF 0.1F 1.5pF ATC 100A 47nH Replace with metal strip jumper 33nH 10nH 150 1206, added shunt to ground on DCisolated side of C8 100pF 0.1F 3.0pF 47pF 47pF 47pF 100pF 47pF 12pF 0.1F 0.6pF ATC 100A 22nH 3.3nH 33nH 3.3nH Omit Component Designation C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 L1 L2 L3 L4 R1 Table 1. Application circuit component values 13 TECHNICAL NOTES AND ARTICLES Copyright 1997-2000 RF Micro Devices, Inc. 13-87 TA0016 13 TECHNICAL NOTES AND ARTICLES 13-88 Copyright 1997-2000 RF Micro Devices, Inc. |
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