A 20 Gbps inductorless CMOS optical receiver for short-distance VCSEL-based 850 nm optical links

摘要

This paper presents a circuit design and experimental results for a 20 Gbps CMOS inductorless optical receiver, a transimpedance amplifier (TIA) and a limiting amplifier, for a vertical-cavity surface emitting laser based 850 nm optical link. The proposed optical receiver apply a power supply noise canceling technique, an additional path from the power supply to the TIA output to generate a reversed phase signal that reduces the power supply noise, and bandwidth enhancement circuit design that dose not require internal inductors. The simulation results shows a power supply rejection ratio of -96.6 dB at 10 MHz, a total gain of 82.8 dBΩ and a -3 dB bandwidth of 15.5 GHz. A test chip fabricated in 90 nm CMOS technology and demonstrated with a PIN photo-diode, a bandwidth of 17 GHz and a responsibility of 0.53 A/W. The measurement results show a 25% eye opening and an input sensitivity of -7.1 dBm at a bit error rate of 10~(-12) with a 2~9 - 1 pseudo-random test pattern at 20 Gbps. The core circuit of the optical receiver occupies only an area of 0.02 mm~2.