Chopper-stabilized instrumentation amplifier

An instrumentation amplifier and amplifier technology, applied in the field of amplifiers, can solve the problems of chopper stabilization design difficulties and other problems

Active Publication Date: 2009-11-25
MEDTRONIC INC
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Problems solved by technology

Ripple can make chopper-stabilized designs difficult in low-power applications

Method used

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  • Chopper-stabilized instrumentation amplifier
  • Chopper-stabilized instrumentation amplifier
  • Chopper-stabilized instrumentation amplifier

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Embodiment Construction

[0028] [0028] This disclosure describes a chopper-stabilized instrumentation amplifier. The instrumentation amplifier is configured for stable measurements at low frequencies with very low power. This instrumentation amplifier utilizes a differential structure and a mixing amplifier to significantly remove noise and offset from the output signal generated by the amplifier. The dynamic limitation (glitching) produced by chopping stabilization at low power is significantly eliminated by combining chopping and feedback of the low impedance node in the mixing amplifier. The signal path of the instrumentation amplifier operates as a continuous-time system, providing minimal aliasing to noise or external signals entering the signal path at the chopping frequency or its harmonics. In this way, instrumentation amplifiers can be used in low-power systems, such as implanted medical devices, to provide a stable, low-noise output signal.

[0029] [0029] For example, a chopper-stabilized...

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Abstract

This disclosure describes a chopper stabilized instrumentation amplifier. The amplifier is configured to achieve stable measurements at low frequency with very low power consumption. The instrumentation amplifier uses a differential architecture and a mixer amplifier to substantially eliminate noise and offset from an output signal produced by the amplifier. Dynamic limitations, i.e., low-frequency glitching, that result from chopper stabilization at low power are substantially eliminated through a combination of chopping at low impedance nodes within the mixer amplifier and feedback. The signal path of the amplifier operates as a continuous time system, providing minimal aliasing of noise or external signals entering the signal pathway at the chop frequency or its harmonics. The amplifier can be used in a low power system, such as an implantable medical device, to provide a stable, low-noise output signal.

Description

technical field [0001] [0001] The present invention relates to amplifiers, and more particularly to instrumentation amplifiers for accurate signal measurements. Background technique [0002] [0002] Instrumentation amplifiers are used to accurately measure a large number of test and measurement signals. For example, a medical instrumentation amplifier can be configured to measure physiological signals such as electrocardiogram (ECG), electromyography (EMG), electroencephalogram (EEG), blood pressure, impedance, and motion signals. Typically, instrumentation amplifiers are constructed as difference amplifiers, which feature low offset, low drift, low noise, high common-mode rejection, high loop gain, and high input impedance. In many cases, instrumentation amplifiers require careful matching and configuration of circuit components to achieve a high degree of accuracy. [0003] [0003] Instrumentation amplifiers can be constructed with discrete-time switched-capacitor architec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/38
CPCA61B5/7228A61B5/7242A61B5/053A61B5/7217A61B5/04H03F3/38A61B5/7225A61B5/7203A61B5/24
Inventor T·J·丹尼森
Owner MEDTRONIC INC
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