Mr. Yi Chen Profile

Yi Chen

at Shanghai Institute of Technical Physics CAS

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Proceedings Article | 22 October 2010 Paper

A CMOS transimpedance amplifier for pulsed laser range finder

Yi Chen, Genghua Huang, Rong Shu, Binyong Wang

Proceedings Volume 7658, 765860 (2010) https://doi.org/10.1117/12.866013

KEYWORDS: Optical amplifiers, Amplifiers, Laser range finders, Receivers, Capacitance, Capacitors, Rutherfordium, CMOS technology, Attenuators, Signal to noise ratio

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The pulsed laser range finding has been extensively applied in space exploration, military use and industry, due to its advantages over other methods of non-contact ranging in simplicity, non-cooperativeness of objects, long detecting range and short range acquisition time. The integration of its receiver channel will be beneficial to weight-lightening, miniaturization and mass production of the laser range finder. A transimpedance amplifier for receiver channel of pulsed range finder is designed using 0.6-μm CMOS technology in this work. It consists of transimpedance pre-amplifier, R-2R resistors ladder variable attenuator and post-amplifier. A regulated cascade circuit (RGC) is used to isolate the input capacitor from input node of transimpedance pre-amplifier, reducing the bandwidth suppression caused by large input capacitor. R-2R variable attenuator is implemented for digital gain control, achieving a total gain control range of 42dB with 7 steps and 6dB per step. Simulation shows that the circuit achieves a bandwidth of 83 MHz with the presence of a 5-pF input capacitor, and a maximum transimpedance of 125.5dBΩ, meeting the requirement of high-precision pulsed laser range finder.

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