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| Data Sheet GB79 10 Gb/s Limiting Amplifier Features Operates at OC-192/STM-64 data rates up to 10.6 Gb/s Differential operation with 50 matched inputs and outputs Single-ended input and output capability 40dB gain at 2.5 Gb/s (singleended) 3mV typical sensitivity at 10 Gb/s (BER=10-9) 650 mW (typ) power dissipation. Single -5.2V power supply 5 mVp-p (min) to 2 Vp-p (max) input voltage range Output peak-to-peak swing adjustable from 50mV to 1Vpp Available in 6mm micro LGA package 0 to 85 oC Applications LAN and WAN optical data systems Serial data paths up to 10.6 Gb/s Fiber optic receivers, transceivers and transmitters High-speed VCSEL driver; predriver for laser module General description The Nortel Networks GB79 is a monolithic limiting amplifier providing wideband, low noise amplification of signals up to 10.6 Gb/s. It features differential inputs and outputs and performance optimized for data rates of 2.5 and 10 Gb/s. The device offers typical gain of 40 dB and has an input sensitivity of 3mVpp (BER=10-9) at 10 Gb/s. The device is fabricated using an advanced InGaP/GaAs HBT process and is supplied in a 6mm 36-ball microLGA package. GB79 2 Tz AMP Data operating temperature 10 GHz Clock & Data 2 Recovery Clk 2 Post Amplifier 2 PIN Receiver Module GB79 MUX Post Amplifier Vset Linear Gain Block Laser Module Figure1: Typical applications block diagram Nortel Networks High Performance Optical Component Solutions offers a portfolio of optical networking interface devices for use in high-performance optical receiver and transmitter applications. The GB79 is one of our family of 10 Gb/s components. The complete family provides for power and chip-count savings to the designer of fiber-based datacom or telecom solutions. The GB79 is also one of a range of limiting and AGC amplifiers for use in optical receivers operating from 155 Mb/s to 10 Gb/s. Functional description The GB79 is intended to be used in OC-192/STM-64 applications with either single-ended or differential input data. During operation, this circuit can accept input signals ranging from 5 mVp-p to2 Vp-p differential, and will return an output selected by voltage "Vset" up to 1 Vp-p per side, single-ended. If desired, this output may be extinguished. Input and output is matched to 50 over the bandwidth of interest. The input reference lines (VrefP and VrefN) must be (RF) decoupled to ground. They are part of an on-chip feedback scheme that allows the differential amplifier to self-balance. This allows input signals to be AC-coupled to the amplifier. DC-coupling to the input of the device over-rides the on-chip self-balancing feedback. Vset may be set to ground which causes the amplifier to limit at ~1Vpp. Applying a negative potential to Vset reduces the output peak-to-peak swing of the amplifier to diminish. Outputs from the amplifier may be DC-coupled with 50 terminations to ground, or AC coupled to 50 loads. GND Decoupling Network A4 A3 VrefP S_INP S_INN VrefN C6 D6 C1 Vset S_OUTP S_OUTN GB 79 F3 Decoupling Network D1 F4 Decoupling Network VSS Figure 2: Functional block diagram Page 2 of 6 GB79 - 10 Gb/s Limiting Amplifier - 01 March 2001 Table 1: Absolute maximum ratings Parameter VSS Tstg Tj Vset Vin description Supply voltage Storage Temperature Junction temperature Output level control voltage Input voltage (VrefP/VrefN open) min -6.5 -65 0 -6.5 -3 max 0.5 125 150 0.5 0.5 units V o C oC V V These are stress ratings only. Exposure to stresses beyond these maximum ratings may cause permanent damage to, or affect the reliability of the device. Avoid operating the device outside the recommended operating conditions defined below: Table 2: Recommended operating conditions Symbol VSS Tamb Vset Vin p-p Parameter Supply Voltage Operating temperature Output level control voltage Differential input voltage min -5.5 0 VSS+2.6 10 typical -5.2 max -4.9 85 0 2000 units V oC V mV p-p Table 3: DC electrical characteristics Symbol ICC Vinput Vout Rout Parameter Supply Current Input Bias Voltage Output Bias Voltage (Note 1) Output resistance min typical 125 -1.6 -0.5 50 max units mA V V Table 4: AC characteristics Symbol BW(3dB) Sens Gain Gain S22 S11 Vout p-p Parameter Small Signal Bandwidth at -3dB point Input Sensitivity at BER=10e-9, 10Gb/s, single-ended Small signal gain (at 2.5 GHz) Small signal gain (at 10 GHz) Output return loss (to 6 GHz) Input return loss (to 6 GHz) Output swing (single-ended) min typical 6.0 3 40 29 max units GHz mVpp dB dB -10 -10 50 1000 dB dB mV p-p The above parameters are specified under the following conditions: * * * Supply Voltage (VSS) = -5.2 V 5% Operating Temperature (Tamb) = 0 to 85oC Note 1: When terminated with 50 ohms to ground. GB79 - 10 Gb/s Limiting Amplifier - 01 March 2001 Page 3 of 6 NT 92AA R D2 Material : Ceramic Notes: 1) All dimensions are in mm unless otherwise noted. 2) Tolerances: (Unless otherwise noted) x.xx +/- 0.10 x.xxx +/- 0.025 3) 50-150 micron thick epoxy when cured for lid attach Figure 3: LGA package mechanical details Page 4 of 6 GB79 - 10 Gb/s Limiting Amplifier - 01 March 2001 Table 5: Ball grid assignment Pad A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6 Name GND GND Vset VrefP GND GND GND GND GND GND GND GND S_OUTP NC GND GND NC S_INP Pad D1 D2 D3 D4 D5 D6 E1 E2 E3 E4 E5 E6 F1 F2 F3 F4 F5 F6 Name S_OUTN NC GND GND NC S_INN GND GND GND GND GND GND GND GND VSS VrefN GND GND Figure 4: Package pinout diagram GB79 - 10 Gb/s Limiting Amplifier - 01 March 2001 Page 5 of 6 Ordering information Please quote the Product Code from Table 6 below when ordering as this is the identification that appears on the part when shipped. Table 6: Product ordering information Product Code Packaged Die: A0809180 (GSMM92AA) Bare Die: A0821784 (QMV1187A-A) Product Name GB79 Limiting Amplifier GB79 Limiting Amplifier For additional information on Nortel Networks products and services, please contact your local representative. Nortel Networks High Performance Optical Component Solutions attn: Marketing Department 2745 Iris Street Ottawa, Ontario Canada K2C 3V5 Tel: 1-800-4 NORTEL Fax: 1-613-763-8416 Email: opticalcomponents@nortelnetworks.com www.nortelnetworks.com/hpocs Copyright 2001 Nortel Networks Corporation. All rights reserved. Nortel, Nortel Networks, the Nortel Networks corporate logo, and the globemark design are trademarks of Nortel Networks Corporation. Any thirdparty trademarks are the property of their respective owners. The information contained in this document is considered to be accurate as of the date of publication. No liability is assumed by Nortel Networks for use of any information contained in this document, or for infringement of any patent rights or any other proprietary rights of third parties which may result from such use. No license is granted by implication or otherwise under any patent right or any other proprietary right of Nortel Networks. Publication # 84033.37/03-01 Issue 4 Issued: 01 March 2001 Page 6 of 6 |
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