Abstract
In the design of CMOS optical receivers, it is challenging to compromise the bandwidth, noise, and gain of the transimpedance amplifier (TIA). The inverter-based cascaded structure is often used in TIA designs. However, the traditional 3-stage TIA needs bandwidth expansion techniques to get good performance. In the designed front-end, we propose a 5-stage cascaded TIA that achieves performance improvement without using bandwidth expansion technique. Besides, the stability of the main amplifier (MA) is improved by adopting a feed-forward compensation technique. Designed in a 0.13-μm CMOS process, the proposed front-end exhibits a bandwidth of 8.9 GHz, a transimpedance gain of 123.5 dB Ω and an average input-referred noise of 12.2 pA/Hz. The whole circuit consumed 19.1 mW from mixed input of 1 V and 1.5 V supply voltages.
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