Isolation amplifier

Details Isolation amplifier Isolation amplifier

1979-12-31

1981-08-25

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

H03F 338

Patent

active

042862256

ABSTRACT:
An isolation amplifier comprising an input section coupled by a multi-winding transformer to an output section. A blocking oscillator produces in the transformer a signal comprising a positive power pulse followed by a negative flyback pulse. The flyback pulse magnitude is modulated by a half-wave diode-capacitor rectifier circuit which supplies negative supply current to an amplifier in the input section. Other half-wave diode-capacitor rectifier circuits in the input section develop (1) a positive supply voltage for the amplifier, (2) a negative feedback signal for the amplifier, and (3) a level-shifting voltage to be combined with the feedback signal. The output section includes additional half-wave diode-capacitor rectifier circuits to develop a demodulation signal derived from the flyback pulse, and a bias voltage to be combined with that signal to develop an input signal for the output amplifier.

REFERENCES:
patent: 3988690 (1976-10-01), Vance et al.
patent: 4066974 (1978-01-01), Reinhard
patent: 4152660 (1979-05-01), Olschewski

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