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The number of amplifiers incorporated in the module of a Chopper stabilized dc amplifiers are ___________

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The number of amplifiers incorporated in the module of a Chopper stabilized dc amplifiers are ___________

(a) 1

(b) 2

(c) 3

(d) 4

This question was addressed to me in an internship interview.

Query is from Telemedicine System topic in chapter Telemedicine Technology of Biomedical Instrumentation

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Correct choice is (c) 3

The explanation: Chopper stabilized dc amplifiers are used for low level but preferably wideband applications such as oscilloscopes, tape recorders and light beam oscilloscope recorders. This includes an ac amplifier for signals above about 20 Hz, a dc chopper input amplifier for signals from about 20 Hz down to dc plus wideband feedback stabilized dc amplifier. These are complex amplifiers having three amplifiers incorporated in the module.

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