Instrumentation amplifier applied to bio-electrical signals

The invention discloses an instrumentation amplifier applied to bio-electrical signals. With the application of a high-frequency chopper technology, flicker noise of the instrumentation amplifier is greatly relieved, so that a level being quite low in noise is achieved. Meanwhile, in combination wit...

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Bibliographic Details
Main Authors YAO YANXIA, DONG YANGTAO, WU XIAOBO, ZHAO MENGLIAN, TANG LIHAN, ZHU BO
Format Patent
LanguageChinese
English
Published 08.09.2017
Subjects
DIAGNOSIS
HUMAN NECESSITIES
HYGIENE
IDENTIFICATION
MEDICAL OR VETERINARY SCIENCE
SURGERY
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Summary:The invention discloses an instrumentation amplifier applied to bio-electrical signals. With the application of a high-frequency chopper technology, flicker noise of the instrumentation amplifier is greatly relieved, so that a level being quite low in noise is achieved. Meanwhile, in combination with the use of a Ping-Pong automatic zero-set amplifier structure and a blocking condenser, output ripple of a capacitive coupling chopper amplifier is eliminated in a main path, so that output of the instrumentation amplifier is protected from interference of ripple signals and signal swing is enhanced. In addition, with the application of a second stage of gain variable amplifier and a variable Miller capacitor, functions of the instrumentation amplifier of being variable in gain and being variable in bandwidth are achieved, wherein the gain can vary from 40dB to 60dB and the bandwidth can vary from 1kHz to 10kHz; and a main amplifier in the gain variable amplifier, which is powered by virtue of two voltages, can r
Bibliography:Application Number: CN201710210015