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Capacitively coupled chopper instrumentation amplifier and associated method

An instrumentation amplifier, capacitively coupled technique used in amplifiers, amplifier improvements to reduce noise effects, amplifier type, etc.

Active Publication Date: 2022-06-07
MAXIM INTEGRATED PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The input offset voltage can degrade the operation of the instrumentation amplifier, and it is therefore desirable that the input offset voltage be as low as possible

Method used

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  • Capacitively coupled chopper instrumentation amplifier and associated method
  • Capacitively coupled chopper instrumentation amplifier and associated method
  • Capacitively coupled chopper instrumentation amplifier and associated method

Examples

Experimental program
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Embodiment Construction

[0086] Conventional CCIA does not perform well with rapid changes in the common-mode component of its input signal. E.g, figure 2 Is a graph 200 showing example waveforms of the CCIA 100 in response to rapid changes in the common mode voltages at the inputs 124 and 126 of the CCIA 100 . Curve 202 represents the voltage at the CCIA input 124, curve 204 represents the voltage at the CCIA input 126, curve 206 represents the voltage at the first gain stage input 120, and curve 208 represents the voltage at the first gain stage input 122, And curve 210 represents the output voltage V of CCIA 100 输出 .

[0087] at time t 1 , the voltage magnitude at each of CCIA inputs 124 and 126 varies from V 1 fast change to V 2 , such that the magnitude of the common-mode voltage at the input of the CCIA 100 varies from V 1 fast change to V 2 . The first reference resistor 112 and the second reference resistor 114 must have large resistance values ​​to prevent excessive signal loss and n...

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PUM

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Abstract

A capacitively coupled chopper instrumentation amplifier comprising: a first chopper; a first gain stage; a capacitive isolation stage electrically coupled between an input of the first gain stage and the first chopper; Two gain stages; a second chopper electrically coupled between the output of the first gain stage and the input of the second gain stage; clamping circuitry electrically coupled to the first gain stage between the input and a reference voltage rail; and a controller. The controller is configured to: (a) detect a change in a first common-mode voltage, which is the common-mode voltage at the input of the amplifier, beyond a threshold; and (b) respond to The clamping circuitry is caused to clamp the input of the first gain stage to the reference voltage rail upon detection of the change in the first common-mode voltage exceeding the threshold.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority to US Provisional Patent Application No. 62 / 577,261, filed October 26, 2017, and US Provisional Patent Application No. 62 / 577,272, filed October 26, 2017. The entire contents of the aforementioned US Provisional Application are incorporated herein by reference. Background technique [0003] Instrumentation amplifiers can amplify smaller differential voltages in the presence of larger common-mode voltages. Therefore, instrumentation amplifiers are often used in applications where the signal to be amplified is relatively small and the common mode voltage is relatively large, such as in pressure sensing applications, temperature sensing applications, and current sensing applications. [0004] An ideal instrumentation amplifier operates with infinite input impedance and zero voltage across its input. However, practical instrumentation amplifiers fall short of these ideal characteristics. Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/30
CPCH03F1/302H03F2200/271H03F2203/45062H03F3/45475H03F1/26H03F3/387H03F2200/135H03F2200/261H03F2200/459
Inventor 陈原傅代红邬峻
Owner MAXIM INTEGRATED PROD INC