Input transformer circuit

Details Input transformer circuit Input transformer circuit

1985-09-24

1987-04-21

Wong, Peter S.

Electricity: power supply or regulation systems

Including a transformer or an inductor

With compensation

330 10, 330165, H01F 2742

Patent

active

046599819

ABSTRACT:
An input transformer circuit in which transformer-isolated, balanced inputs are provided operates with low distortion and employs a transformer that has an equal number of turns in the primary and secondary windings and which is operated in the current mode to drive the two inputs of an operational amplifier. One input of the operational amplifier is connected to ground and the circuit operates to drive the other input to virtual ground, so that by transformer action the signal voltage across the ends of the primary winding is essentially zero. Because the signal voltages across the primary and secondary windings of the transformer are both substantially zero, there is relatively no induced electromotive force and no signal distortion occurs in the transformer.

REFERENCES:
patent: 2891214 (1959-06-01), Rogers et al.
patent: 3815013 (1974-06-01), Milkovic
patent: 4270061 (1981-05-01), Gronner et al.
patent: 4360784 (1982-11-01), Bartlett

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