This paper presents a high bandwidth and low noise fully differential main amplifier (FDMA) for pulsed time-of-flight (TOF) imaging laser detection and ranging application (LADAR), which serves to amplify the small pulse echo signal. The cascaded architecture and active inductor technology are used to enlarge the bandwidth of the circuit and reduce the chip area. The cascaded gain stages, which adopted DC offset isolation circuit, are more robust to the alteration of process. A large bandwidth

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... mplifier (LBA) and an output buffer (OB) structure have been designed to enhance the drive capabilities. Besides, in order to adapt the demand of the LADAR system, the amplifier receiver's bandwidth has been limited by using an inter-stage bandpass filter. Implemented in CSMC CMOS technology, the FDMA chip realizes the -3 dB bandwidth of 730.6 MHz, and an open loop gain of 23.5 dB with the bandpass filter worked. The input-referred noise voltage is 2.7 nV/sqrt(Hz), which effectively reduces the system noise. This chip that occupies 0.25 mm×0.25 mm in area consumes a power dissipation of 102.3 mW from the 3.3 V power supply. As a part of the integrated chip of the laser radar system, it can better meet the requirements of system. Keywords: laser detection and ranging (LADAR) receiver; fully differential main amplifier; cascaded gain stage; active inductor Citation: Jiang Y, Liu R Q, Zhu J G, et al. A high-performance CMOS FDMA for pulsed TOF imaging LADAR system[J]. Opto-Electronic Engineering, 2019, 46(7): 190194 应用于脉冲 TOF 成像 LADAR 系统的高性能 CMOS 全 差分放大器设计