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Switching device and feedback resistor circuit

A technology of switching devices and circuits, applied to electronic switches, components of amplifier devices, electrical components, etc., can solve the problem of low bandwidth of PGA

Active Publication Date: 2022-06-21
广州瀚辰信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The inventor found that the existing PGA has the problem of low bandwidth

Method used

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  • Switching device and feedback resistor circuit
  • Switching device and feedback resistor circuit
  • Switching device and feedback resistor circuit

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Embodiment Construction

[0042] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the related drawings. Embodiments of the present application are presented in the accompanying drawings. However, the application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0043]Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application.

[0044] It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elem...

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Abstract

The invention relates to a switch device and a feedback resistance circuit. The device comprises: the first transmission terminal of the first transistor is used to connect the input terminal of the operational amplifier; the second transmission terminal of the first transistor is used to connect the output terminal of the operational amplifier through a feedback resistor; the control terminal of the first transistor is used to connect The first gating control circuit is used to respond to the first gating control signal output by the first gating control circuit to enter the gating state or the off state; the output terminal of the substrate voltage selection module is connected to the first transistor of the first transistor Three transmission terminals, one input terminal of the substrate voltage selection module is used to connect the input terminal of the operational amplifier, the control terminal of the substrate voltage selection module is used to connect the first gating control circuit; the substrate voltage selection module is used to connect the first gating control circuit; With the transistor in the gated state, the substrate of the first transistor transmits the input voltage of the operational amplifier. The device can improve the bandwidth of the programmable gain amplifier.

Description

technical field [0001] The present invention relates to the technical field of receiver signal processing, in particular to a switching device and a feedback resistance circuit. Background technique [0002] In the receiver system, the signal received by the receiver varies widely. In order to demodulate the received signals with different strengths, the system controls the PGA (Programmable Gain Amplifier) ​​through AGC (Automatic Gain Control, automatic gain control circuit). ) to maintain the output signal at a certain amplitude, and the gain adjustment step generally needs to achieve decibel (dB) linearity. PGA generally uses programmable resistance to adjust the gain. By changing the feedback resistance, the ratio between the feedback resistance and the input resistance can be changed, so as to realize the change of the circuit gain. In the mainstream CMOS process, a MOS transistor is generally used as a switch to adjust the resistance value of the resistor, or the MOS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/687H03F1/48H03F1/56H03F3/195H03F3/213
CPCH03K17/687H03F1/486H03F1/56H03F3/195H03F3/213H03F2200/36
Inventor 王祥炜李金明刘渭陈红林
Owner 广州瀚辰信息科技有限公司
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