Differential current mode driver circuit with low common-mode no

Details Differential current mode driver circuit with low common-mode no Differential current mode driver circuit with low common-mode no

1994-05-31

1995-06-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327108, 327563, G01R 1900

Patent

active

054246628

ABSTRACT:
An improved, differential current-mode driver circuit with low common-mode noise and high output impedance. In this circuit both sink and source currents are controlled by two pairs of emitter coupled differential amplifiers operated as current switches. One of the pairs of current switches is comprised of PNP transistors and hence slower than the other pair of current switches which is comprises of NPN transistors. The input data is applied differentially to the slower pair of the current switches and simultaneously to auxiliary switches which act as inverting amplifiers and are cross-coupled to and drive the inputs of the two faster current switches. A fifth current switch and auxiliary switch inverting amplifier is used to as an inhibit circuit to shunt both source and sink currents to ground so that no circuit node will swing excessively while holding the output nodes of the current sink and source a constant voltage thus reducing common-mode noise.

REFERENCES:
patent: 4124808 (1978-11-01), Shah et al.
patent: 4697099 (1987-09-01), Bonaccio
patent: 5017815 (1991-05-01), Shah et al.
patent: 5227681 (1993-07-01), Koyama et al.
patent: 5274275 (1994-12-01), Colles
patent: 5345121 (1994-09-01), Itoh

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