Device for converting unbalanced analog electric signals into fu

Details Device for converting unbalanced analog electric signals into fu Device for converting unbalanced analog electric signals into fu

1990-07-31

1991-12-03

Mullins, James B.

Amplifiers

Sum and difference amplifiers

330148, 330260, 330301, H03F 345

Patent

active

050703056

ABSTRACT:
An all-differential operational amplifier (20) has a first input (22) and a second input (24) and correspondingly has a first output (26) and a second output (28), fed back on its own input respectively through a first (34) and second (36) impedance which are generally resistive and have identical values. The first output is connected to the second input of the operational amplifier across a third impedance (32). A fourth impedance (30), equal in value to the third impedance, is connected in series to the first input and acts as input terminal of the converter. The resistive components of the impedance can be implemented as switched capacitors.

REFERENCES:
patent: 4723112 (1988-02-01), Diller et al.
Martin, "Improved Circuits for the Realization of Switched Capacitor Filters", Proceedings of the 1979 International Symposium on Circuits and Systems, Tokyo, Japan, Jul. 17-19, 1979, pp. 756-759.

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