Isolation amplifier with precise timing of signals coupled acros

Details Isolation amplifier with precise timing of signals coupled acros Isolation amplifier with precise timing of signals coupled acros

1988-05-10

1989-05-30

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

328127, H03F 338

Patent

active

048354864

ABSTRACT:
A low cost, high frequency isolation amplifier includes a first voltage-to-frequency converter producing a first pair of complementary pulses in response to an analog input signal and applying them to a pair of low capacitance capacitors constituting the isolation barrier. The isolation barrier differentiates edges of the first pair of pulse signals and applies the resulting signals to inputs of a sense amplifier including a differential amplifier, a pair of comparators, and a flip-flop to precisely reconstruct the first pair of complementary pulse signals, which then are fed into a decoder circuit including a phase locked loop. The phase locked loop includes a phase detector receiving the reconstructed pair of complementary pulse signals and a second pair of complementary pulse signals produced by a second voltage-to-frequency converter. The output of the phase detector is integrated by a filter circuit, the output of which produces a voltage that represents the analog input signal and causes the output of the second voltage-to-frequency converter to be synchronized with the second pair of complementary pulse signals when the analog output signal matches the analog input signal.

REFERENCES:
patent: 3168704 (1965-02-01), Gibbons
patent: 3264569 (1966-08-01), Lefferts
patent: 3437943 (1969-04-01), Mader
patent: 3537022 (1970-10-01), Regan
patent: 3714540 (1973-01-01), Galloway
patent: 4117411 (1978-09-01), Goble
patent: 4178556 (1979-12-01), Attwood
patent: 4193028 (1980-03-01), Downs, II
patent: 4249135 (1981-02-01), Fisher et al.
patent: 4292595 (1981-09-01), Smith

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