Isolation amplifier with high linearity

Details Isolation amplifier with high linearity Isolation amplifier with high linearity

1978-06-05

1980-03-04

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330 75, 330165, H03F 338

Patent

active

041919297

ABSTRACT:
A transformer-coupled isolation amplifier which can accept signals over a wide dynamic range while maintaining very high linearity. An input signal is applied to an input winding of a transformer. The secondary winding of the isolation transformer is connected across the differential inputs of a high-gain amplifier. Negative feedback is provided around the amplifier so that the transformer secondary winding is connected across a virtual short; and the negative feedback tends to drive the voltage applied to the inputs of the amplifier to a very small value. The negative feedback from the amplifier induces a current in the transformer secondary which cancels the flux produced by current flowing in the primary, thereby reducing the effects of non-linearities in the BH curve of the transformer.

REFERENCES:
patent: 2358480 (1944-09-01), Skilling
patent: 2497129 (1950-02-01), Liston
patent: 3173096 (1965-03-01), Hinrichs et al.
patent: 3466557 (1969-09-01), Nazareth
patent: 3828269 (1974-08-01), Norton
patent: 3974425 (1976-08-01), Ueda et al.

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