Method and circuit for reducing effects of distributed capacitan

Details Method and circuit for reducing effects of distributed capacitan Method and circuit for reducing effects of distributed capacitan

1988-06-06

1990-02-27

Mottola, Steven

Amplifiers

Signal feedback

Phase shift means in loop path

330 76, 330307, H03F 136

Patent

active

049049518

ABSTRACT:
A technique for reducing phase shift of a signal passing through a large thin film resistor on an insulating layer includes applying a signal to one terminal of the thin film resistor and also to one end of an underlying doped epitaxial region. The opposite terminal of the thin film resistor is connected to a virtual ground or virtual reference voltage produced by an inverting input of an operational amplifier. The corresponding opposite end of the epitaxial layer is connected to ground or other reference voltage. The voltage gradients produced by currents flowing through both the thin film resistor and the epitaxial layer are equal, so that substantially no incremental charging current flows through capacitance between the thin film resistor and the epitaxial layer. Phase shift of the signal flowing through the thin film resistor is thereby avoided.

REFERENCES:
patent: 4118672 (1978-10-01), Noguchi
patent: 4338571 (1982-07-01), Young

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