Amplifiers – Modulator-demodulator-type amplifier
Patent
1975-08-28
1977-06-14
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
330 59, H03F 338
Patent
active
040300412
ABSTRACT:
An analog isolator includes a circuit wherein a power transformer has a primary winding for connection to an A.C. source, a first and second power take-off secondary windings and a first and second signal secondary windings. The A.C. signal of the first signal secondary winding is compared with an input signal to provide cross-over pulses. Those pulses are applied to control an isolator device such as a photocoupler. The output signal from the photocoupler is applied as gate control signals to control the selective gating of the signals from the second signal secondary winding. The selectively gated signals are applied either to a sample-and-hold arrangement or to an integrating smoothing circuit to provide effectively a reconstruction of the input signal but conductively isolated from the input circuit.
REFERENCES:
patent: 3656065 (1972-04-01), Reinhard et al.
patent: 3913001 (1975-10-01), Kayama
Burton Lockwood D.
Honeywell Inc.
Marhoefer Laurence J.
Mullins James B.
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