NOISE REDUCTION CIRCUIT, METHOD, APPARATUS, DEVICE AND PHOTORECEIVER

WIPO Patent Application WO/2022/174403

A1

The embodiments of the present application discloses a noise reduction circuit, comprising: a first signal detection module, a first grounding circuit, a first trans-impedance amplifier, a second operational amplifier and a reference voltage generator; wherein the first signal detection module is configured to output a direct current signal and an alternating current signal; the first grounding circuit is coupled between a grounding end and an output end of the first signal detection module; the first trans-impedance amplifier is coupled to the output end of the first signal detection module, and a signal outputted by an output end of a first operational amplifier included in the first trans-impedance amplifier is in the reverse direction to a signal received by the input end thereof; a negative input end of the second operational amplifier is coupled to the output end of the first operational amplifier; and a positive input end of the second operational amplifier is coupled to the reference voltage generator, and is configured to receive an adjustable reference voltage outputted by the reference voltage generator. The present application further provides a method, an apparatus, a device, a photoreceiver, and a medium. By adjusting a voltage inputted by the reference voltage generator, a noise value generated by the direct current signal grounding can be adjusted.

LIAO KEYUAN (CN)
WANG HONGYU (CN)

PCT/CN2021/076966

August 25, 2022

February 20, 2021

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HUAWEI TECH CO LTD (CN)

H03F1/08

US20140111280A1	2014-04-24
CN108141180A	2018-06-08
US6359517B1	2002-03-19

SHENPAT INTELLECTUAL PROPERTY AGENCY (CN)

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