Differential signal amplification circuit, digital isolator, and digital receiver

A technology of differential amplifiers and amplifying circuits, which is applied in the direction of differential amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as abnormal signal transmission functions, and achieve the effect of suppressing common-mode interference signals

Active Publication Date: 2020-07-24
SUZHOU NOVOSENSE MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the DC offset voltage caused by the common mode interference of the input voltage of the above-mentioned amplifying circuit further leads to the problem that the signal transmission function is abnormal

Method used

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  • Differential signal amplification circuit, digital isolator, and digital receiver
  • Differential signal amplification circuit, digital isolator, and digital receiver
  • Differential signal amplification circuit, digital isolator, and digital receiver

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Embodiment Construction

[0047] Preferred embodiments of the technical solutions of the present invention are described in detail below in conjunction with the accompanying drawings, so as to help those skilled in the art understand the technical solutions of the present invention.

[0048] figure 2 The structural diagram of the differential signal amplifying circuit shown includes a multi-stage differential amplifier 100 and a common-mode transient adaptive bias circuit (CMTI) 200 for providing the bias current of the multi-stage differential amplifier 100 .

[0049] The multi-stage differential amplifier 100 includes at least two stages of differential amplifiers, the input end of the common-mode transient adaptive bias circuit 200 is connected to the positive input end INP and the negative input end INN of the multi-stage differential amplifier, and a The positive or negative common-mode interference signal is input to the common-mode transient adaptive bias circuit 200 . The common-mode transient ...

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Abstract

The invention discloses a differential signal amplification circuit, and a digital isolator and a receiver using the differential signal amplification circuit. The differential signal amplifying circuit comprises a multi-stage differential amplifier and a common-mode transient self-adaptive biasing circuit; and the common-mode transient adaptive bias circuit is used for detecting positive or negative common-mode transient interference signals of the positive input end and the negative input end and providing bias current of at least one stage of differential amplifier above the second stage when the positive or negative common-mode transient interference signals are detected. According to the technical scheme, abnormal signal transmission caused by common-mode interference signals can be suppressed.

Description

technical field [0001] The invention belongs to the field of electrical coupling devices, in particular to a differential signal amplifying circuit, a digital isolator and a digital receiver. Background technique [0002] The digital isolation circuit is used to provide an intermediate circuit between the digital signal transmitting circuit and the receiving circuit. The isolation circuit keeps different electrical devices in communication, such as communication between weak current and strong current circuits, and at the same time prevents interference between different circuits. [0003] figure 1 It is the implementation of the traditional digital isolator, adopts OOK modulation and demodulation technology, and is composed of the transmitting circuit TX and the receiving circuit RX, and transmits the high and low levels in the digital signal by sending or not sending high-frequency clock signals. [0004] Transmitting circuit TX and receiving circuit RX circuit elements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/26H03K19/0175H03K19/0185H03K19/003H04B1/10H04B1/16H04B1/40
CPCH03F3/45479H03F1/26H03K19/017545H03K19/018557H03K19/00315H03K19/00361H04B1/1027H04B1/16H04B1/40H03F3/45708H03F2200/271H03F2203/45156H03F2203/45544H03F3/45183H03F2200/42H03F2200/48H03F2203/45596H03F2203/45631H03F2203/45476H03F2203/45702H03F2203/45051H03F2203/45451H03F2203/45454H03F3/45717H03F3/45632H03F2200/372
Inventor 陈奇辉盛云
Owner SUZHOU NOVOSENSE MICROELECTRONICS CO LTD
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