Single-ended input to differential output amplifier with integra

Details Single-ended input to differential output amplifier with integra Single-ended input to differential output amplifier with integra

1990-03-29

1991-09-17

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330258, 330294, H03F 345

Patent

active

050498312

ABSTRACT:
A single-ended input to differential output amplifier performs a predetermined transfer function on an input signal substantially independently of nonlinearities in component values. The input signal and a first reference voltage are coupled to a circuit network, which is coupled to a fully differential operational amplifier, to implement the predetermined transfer function. A common mode voltage between positive and negative output signals of the operational amplifier is sensed and fed back to the operational amplifier so that the operational amplifier may set the common mode voltage to a second reference voltage. The circuit network has first, second, and third capacitors, the third capacitor coupled between a positive input terminal and the first reference voltage. To reduce circuit area, the third capacitor is coupled between a positive input terminal and the negative output terminal of the operational amplifier, allowing either the first capacitor or the second capacitor to be halved in size to again implement the predetermined transfer function.

REFERENCES:
patent: 4241428 (1980-12-01), Berni et al.
patent: 4242741 (1980-12-01), Parrish
patent: 4573020 (1986-02-01), Whatley
patent: 4697152 (1987-09-01), Westwick
patent: 4720686 (1988-01-01), Westwick
patent: 4782305 (1988-11-01), Westwick et al.

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