Instrumentation amplifier and signal amplification method

摘要

An instrumentation amplifier (1) comprising: a first amplifier (10) having one input connected to a first input (InP) of the instrumentation amplifier; a second amplifier (12) having one input connected to a second input (InN) of the instrumentation amplifier; and a feedback network (14) 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 (InP,InN) 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 (InP,InN) of the instrumentation amplifier. The invention also relates to a device for acquiring biopotential signals and a signal amplification method.