一个25Gbps差分低噪声TIA, 10.9 pA/√Hz, 45RFSOI

2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM) Pub Date : 2021-11-28 DOI:10.1109/iwem53379.2021.9790575

Jinfeng Xie, Juncheng Deng, A. Wahba, F. Lin

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引用次数: 0

摘要

提出了一种45RFSOI的25Gbps单端差分(S2D)低噪声跨阻放大器(TIA)。采用交流耦合电容和电容交叉耦合对实现S2D差分输出。为了同时优化噪声和带宽，采用高增益低带宽输入级后接连续时间线性均衡器(CTLE)， CTLE利用感应峰值和负电容实现3.9的带宽扩展比(BWER)，峰值小于0.5dB。后置仿真结果表明，在光电二极管电容为70fF的情况下，所设计的TIA实现了63.3 dB的跨阻增益和22.6 ghz的总带宽。输入平均噪声电流谱密度为10.9 pA/√Hz，功耗为38mW，供电1.3V。

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A 25Gbps Differential Low Noise TIA with 10.9 pA/√Hz in 45RFSOI

A 25Gbps single-ended to differential (S2D) low noise transimpedance amplifier (TIA) in 45RFSOI is presented. A ac-coupling capacitor and a capacitor cross-coupled pair are used to achieve S2D differential output. To optimize both noise and bandwidth, a high-gain low-bandwidth input stage followed by a continuous-time linear equalizer (CTLE) is adopted, where the CTLE uses inductive peaking and negative capacitance to achieve a bandwidth extension ratio (BWER) of 3.9 with less than 0.5dB peaking. Post simulation results show that the designed TIA achieves 63.3 dB transimpedance gain, and 22.6-GHz overall bandwidth while the photodiode capacitance is accounted for 70fF. The input average noise current spectral density is 10.9 pA/ √Hz, and the power consumption is 38mW with 1.3V supply.

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来源期刊

2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)

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