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Chopper-stabilized instrumentation amplifier for impedance measurement

A technology of instrument amplifiers and amplifiers, which is applied in the direction of DC-coupled DC amplifiers, amplifiers, differential amplifiers, etc., and can solve problems such as difficulties in implementing chopper-stabilized designs

Active Publication Date: 2009-11-25
MEDTRONIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This ripple can make it difficult to implement chopper-stabilized designs in low-power applications

Method used

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  • Chopper-stabilized instrumentation amplifier for impedance measurement
  • Chopper-stabilized instrumentation amplifier for impedance measurement
  • Chopper-stabilized instrumentation amplifier for impedance measurement

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Embodiment Construction

[0028] [0028] This disclosure describes chopper-stabilized instrumentation amplifiers. The instrumentation amplifier is configured to make stable measurements at low frequencies using very little power. The instrumentation amplifier uses a differential architecture and a mixing amplifier to substantially remove noise and offset from the output signal produced by the amplifier. In the mixer amplifier and feedback, dynamic limits such as glitches caused by chopping stabilization at low power are substantially eliminated or reduced by incorporating chopping at low impedance nodes. The signal path of the instrumentation amplifier acts as a continuous-time system, providing minimal aliasing of 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 implantable medical devices, to provide a stable, low-noise output signal.

[0029] [0029] A chopper-stabilized in...

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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., 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 precise signal measurements. Background technique [0002] [0002] Instrumentation amplifiers are used to accurately measure various test and measurement signals. For example, a medical instrumentation amplifier might be configured to measure physiological signals such as electrocardiogram (ECG), electromyography (EMG), electroencephalogram (EEG), pressure, impedance, and motion signals. Typically, instrumentation amplifiers are constructed as differential amplifiers with low offset, low drift, low noise, high common-mode rejection, high loop gain, and high input impedance. In many cases, instrumentation amplifiers may require careful matching and fine-tuning of circuit components to achieve high accuracy. [0003] [0003] Instrumentation amplifiers may be constructed using discrete switched capacitor structures that obtain discrete signal sample...

Claims

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Application Information

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IPC IPC(8): H03F3/38H03F3/45H03F1/26H03F3/387A61B5/308
CPCH03F2203/45212A61B5/7228H03F2203/45138H03F3/45744H03F2200/372A61N1/36521H03F1/26H03F2200/252H03F2203/45028H03F2200/375H03F2203/45551A61B5/0428A61N1/3704H03F2200/271H03F2200/153H03F3/45192H03F3/45183H03F2203/45534H03F3/387H03F2203/45512H03F2200/261A61B5/04004A61B5/103A61N1/3702H03F3/45968A61B5/0002A61B2560/0209A61B5/7217H03F3/45475H03F2203/45396A61B5/7203A61N2001/083H03F2203/45264A61B5/053A61B5/30H03F3/38
Inventor T·J·丹尼森W·A·桑塔
Owner MEDTRONIC INC
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