Title

Current Comparator with SiGe BiCMOS Input Stage for Photon-Counting LiDAR Applications

Document Type

Conference Proceeding

Publication Date

9-13-2021

Publication Title

2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)

Publisher

Institute of Electrical and Electronics Engineers

Publisher Location

Lansing, MI

First page number:

420

Last page number:

423

Abstract

A current-mode photon-counting circuit is proposed for long-range LiDAR applications to interface with a microchannel plate (MCP) photomultiplier tube (PMT). Based on the idea of a current-mode comparator, the proposed topology combines a BiCMOS regulated cascode current buffer together with a CMOS current comparator. The circuit accepts two input current signals, the photodetector current and a user-adjustable threshold current, and outputs a 1.8-V digital signal depending on the polarity of the difference current. Designed and characterized in a 180-nm SiGe BiCMOS process, the proposed design provides a 50-Ω input impedance up to 2-GHz and can detect 8-uA current pulses with widths of 300-ps FWHM at a count rate of 1-GHz. The solution also offers a low static power consumption of 4.07mW/channel dissipated from a 2.5-V and 1.8-V dual supply.

Keywords

Microchannel plate (MCP); Photomultiplier tube (PMT); Photon-counting system; Readout integrated circuit (ROIC); Silicon photomultiplier (SiPM)

Disciplines

Digital Circuits | Electromagnetics and Photonics

Language

English


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