A 25 Gbps limiting amplifier (LA) with loss of signal (LOS) detection is presented in this paper. The proposed LA is composed of an input buffer, three‐stage cascaded amplifier, an output buffer, a DC offset cancellation (DCOC) and a LOS circuit. The LA adopts single‐end input and differential output structure to reduce the complexity of optical receiver front‐end and therefore decrease power consumption drastically. DCOC circuit consists of a low‐pass filter and an operation amplifier to extract the DC point of transimpedance amplifier output signal. Replica peak detector is employed in LOS to overcome the fluctuations of process, voltage, temperature (PVT). Fabricated in 0.13 μm SiGe BiCMOS technology, the LA acquires gain of 43.5, –3 dB bandwidth of 20.6 GHz and differential output voltage swing of 350 mV. With the 20 mV PRBS31 input data, the peak‐to‐peak jitter of output signal is 13.9 ps. When the input swing is larger than 40 mV, the peak‐to‐peak jitter is decreased to 7.5 ps. The whole LA with LOS chip only consumes 25.2 mW with a 1.8 V supply voltage.

中文翻译：

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25 Gbps单端输入限制放大器，具有信号损失，适用于低功率集成光接收机

本文提出了一种具有信号丢失（LOS）检测功能的25 Gbps限幅放大器（LA）。拟议的LA由输入缓冲器，三级级联放大器，输出缓冲器，DC偏移消除（DCOC）和LOS电路组成。洛杉矶采用单端输入和差分输出结构，以降低光接收器前端的复杂性，从而大大降低功耗。DCOC电路由一个低通滤波器和一个运算放大器组成，以提取跨阻放大器输出信号的直流点。LOS中使用复制峰值检测器来克服过程，电压，温度（PVT）的波动。LA采用0.13μmSiGe BiCMOS技术制造，获得43.5的增益，20.6 GHz的–3 dB带宽和350 mV的差分输出电压摆幅。利用20 mV PRBS31输入数据，输出信号的峰峰值抖动为13.9 ps。当输入摆幅大于40 mV时，峰峰值抖动降至7.5 ps。带有LOS芯片的整个LA在电源电压为1.8 V时仅消耗25.2 mW。