Feedback isolation amplifier

Amplifiers – Modulator-demodulator-type amplifier

Patent

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Details

Other Related Categories

330 59, 330165, H03F 338

Type

Patent

Status

active

Patent number

051874466

Description

ABSTRACT:
An isolation amplifier employs feedback to accurately amplify an input signal while maintaining electrical isolation between the input and output signals. The isolation amplifier consists of an amplitude modulator, an isolation transformer having a pair of matched secondary windings, a peak-detector output circuit, and a matching peak-detector feedback circuit. The isolation transformer couples an amplitude-modulated signal to both peak detector circuits while maintaining electrical isolation. The output from the feedback circuit is fed back to the amplitude modulator, so that the amplitude-modulated signal represents the difference between the input to the amplifier and the feedback signal.

REFERENCES:
patent: 3602801 (1971-08-01), Williamson
patent: 3885219 (1975-05-01), Vaughn
patent: 3921088 (1975-11-01), Feucht
patent: 4191929 (1980-03-01), Max et al.
patent: 4337438 (1982-06-01), Guggenbuhl et al.

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