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Capacitive-coupled chopper instrumentation amplifiers and associated methods

An instrumentation amplifier, capacitive coupling technology, applied to amplifiers, improved amplifiers to reduce noise effects, amplifier types, etc.

Active Publication Date: 2019-05-03
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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  • Capacitive-coupled chopper instrumentation amplifiers and associated methods
  • Capacitive-coupled chopper instrumentation amplifiers and associated methods
  • Capacitive-coupled chopper instrumentation amplifiers and associated methods

Examples

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Embodiment Construction

[0086] Conventional CCIAs do not perform well with rapid changes in the common-mode content of their input signals. For example, figure 2 is a graph 200 illustrating an example waveform of the CCIA 100 in response to a rapid change in the common-mode voltage at the input terminals 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 input 120 of the first gain stage, curve 208 represents the voltage at the input 122 of the first gain stage, and the curve 210 represents the output voltage V of the CCIA 100 输出 .

[0087] at time t 1 , the voltage amplitude at each of the CCIA inputs 124 and 126 varies from V 1 rapid change to V 2 , such that the magnitude of the common-mode voltage at the input of the CCIA 100 changes from V 1 rapid change to V 2 . The first reference resistor 112 and the second reference resistor 114 must have large resistanc...

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Abstract

A capacitive-coupled chopper instrumentation amplifier includes a first chopper, a first gain stage, a capacitive isolation stage electrically coupled between inputs of the first gain stage and the first chopper, a second gain stage, a second chopper electrically coupled between outputs of the first gain stage and inputs of the second gain stage, clamping circuitry electrically coupled between theinputs of the first gain stage and a reference voltage rail, and a controller. The controller is configured to (a) detect a change in a first common-mode voltage exceeding a threshold value, the first common-mode voltage being a common-mode voltage at the inputs of the amplifier, and (b) in response to detecting the change in the first common-mode voltage exceeding the threshold value, cause theclamping circuitry to clamp the inputs of the first gain stage to the reference voltage rail.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 577,261, filed October 26, 2017, and U.S. Provisional Patent Application No. 62 / 577,272, filed October 26, 2017. The entire contents of the aforementioned US Provisional Application are hereby incorporated by reference. Background technique [0003] Instrumentation amplifiers are capable of amplifying small differential voltages in the presence of large 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 inputs. However, practical instrumentation amplifiers fall short of these ideal cha...

Claims

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Application Information

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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
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