Title: Isolation amplifier

Abstract: An isolation amplifier comprising three separate, conductively-isolated sections: (1) an input section including an AC modulator, (2) an output section including a demodulator, and (3) an oscillator section. The AC signal from the oscillator section is transformer-coupled to the modulator section to provide the AC carrier excitation for the modulator and also to energize a rectifier power supply circuit to produce DC voltages for the active elements of the input section. The modulated carrier signal developed by the modulator section is transformer-coupled to the demodulator section. Each of the transformers includes two separate cores which are coupled inductively by single-turn windings. Special electrostatic shielding is provided to reduce leakage effects.

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Inventors: Smith, Lewis R. (Sudbury, MA, US)

Application Number: 521930
Filing Date: 1974-11-07
Publication_date: 1976-03-23
Assignee: Analog Devices, Incorporated (Norwood, MA)
Primary Class(es): 330/10
Other Classes:
US Patent Ref:

2205075	Jun, 1940	Wilhelm	333/77.
3156859	Nov, 1964	Cox	321/8.
3196364	Jul, 1965	Latha, Jr.	330/68.
3405366	Oct, 1968	Philbrick	330/7.

Other Refs:
Primary Examiner: Mullins, James B.
Assistant Examiner:
Attorney: Parmelee, Johnson & Bollinger