Feedback isolation amplifier

Details Feedback isolation amplifier Feedback isolation amplifier

1992-06-10

1993-02-16

Mottola, Steven

Amplifiers

Modulator-demodulator-type amplifier

330 59, 330165, H03F 338

Patent

active

051874466

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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