A receive circuit of an isolated transceiver chip and an isolated transceiver chip

By employing envelope detection and bias circuits in the isolated transceiver chip to separate differential-mode signals and common-mode interference signals, and providing a stable DC bias, the problem of signal judgment errors caused by common-mode interference is solved, thereby improving the accuracy of signal transmission and anti-interference capability.

CN122372014APending Publication Date: 2026-07-10ZHONGKE SAIFEI (GUANGZHOU) SEMICON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHONGKE SAIFEI (GUANGZHOU) SEMICON CO LTD
Filing Date
2026-05-27
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In the prior art, when there is excessive common-mode interference in the encoded signal, the receiver may incorrectly determine whether there is a differential-mode signal in the encoded signal, resulting in incorrect digital signal reconstruction.

Method used

An envelope detection circuit and a bias circuit are used to separate the input signal into differential-mode signal and common-mode interference signal through a cross-coupling path. The bias circuit provides a stable DC bias to suppress common-mode interference and keep the operating point of the envelope detection circuit stable.

Benefits of technology

It effectively suppresses common-mode interference, ensures accurate extraction of differential-mode signals, and improves the anti-interference capability and signal transmission accuracy of the isolation transceiver chip.

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Abstract

This application discloses a receiving circuit and an isolated transceiver chip. The receiving circuit includes: an envelope detection circuit, comprising a first input terminal and a second input terminal for receiving a high-frequency modulated differential input signal, a separation circuit for separating the input signal into a first detection signal and a second detection signal, and a first output terminal and a second output terminal for outputting the first detection signal and the second detection signal; and a bias circuit connected to the envelope detection circuit, which provides a DC bias to a bias node inside the envelope detection circuit and can adaptively suppress voltage fluctuations of the bias node when there is common-mode interference in the input signal, so that common-mode interference can be eliminated when recovering the differential signal based on the first detection signal and the second detection signal, thus solving the problem that if there is excessive common-mode interference in the input signal, the prior art will incorrectly determine that there is no differential signal in the input signal.
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