Instrumentation Amplifier and Signal Amplification Method
First Claim
1. An instrumentation amplifier comprising:
- a first amplifier having one input connected to a first input of the instrumentation amplifier;
a second amplifier having one input connected to a second input of the instrumentation amplifier; and
a feedback network comprising an active filter having a first low pass filter characteristic with a first cut-off frequency in respect of differential mode signals at the first and second inputs of the instrumentation amplifier, and a second low pass filter characteristic with a second cut-off frequency in respect of common mode signals at the first and second inputs of the instrumentation amplifier.
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Abstract
An instrumentation amplifier includes a first amplifier having one input connected to a first input of the instrumentation amplifier, a second amplifier having one input connected to a second input of the instrumentation amplifier, and a feedback network. The feedback network including an active filter having a first low pass filter characteristic with a first cut-off frequency in respect of differential mode signals at the first and second inputs of the instrumentation amplifier, and a second low pass filter characteristic with a second cut-off frequency in respect of common mode signals at the first and second inputs of the instrumentation amplifier. The disclosure also relates to a device for acquiring biopotential signals and a signal amplification method.
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Citations
15 Claims
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1. An instrumentation amplifier comprising:
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a first amplifier having one input connected to a first input of the instrumentation amplifier; a second amplifier having one input connected to a second input of the instrumentation amplifier; and a feedback network comprising an active filter having a first low pass filter characteristic with a first cut-off frequency in respect of differential mode signals at the first and second inputs of the instrumentation amplifier, and a second low pass filter characteristic with a second cut-off frequency in respect of common mode signals at the first and second inputs of the instrumentation amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A signal amplification method, comprising:
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amplifying a first input signal using a first amplifier; amplifying a second input signal using a second amplifier; and in a feedback network connected to the first and second amplifiers; applying a first low pass filter characteristic to differential mode signals between the first and second input signals thereby to pass differential DC signals and block differential mode signals at the frequencies of interest; and applying a second low pass filter characteristic to common mode signals between the first and second inputs signals thereby to pass and amplify common mode signals.
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Specification