Differential buffer circuit with reduced output common mode...

Details Differential buffer circuit with reduced output common mode... Differential buffer circuit with reduced output common mode...

2007-07-24

2007-07-24

Le, Don (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S026000

Reexamination Certificate

active

11285800

ABSTRACT:
A differential buffer circuit includes a current source, a current sink, and a switching circuit connected to the current source at a first node and connected to the current sink at a second node. The switching circuit is operative to selectively control a direction of current flowing through differential outputs of the buffer circuit in response to at least a first control signal. The buffer circuit further includes a common mode detection circuit and a common mode control circuit. The common mode detection circuit is operative to detect an output common mode voltage of the buffer circuit and to generate a second control signal representative of the output common mode voltage. The common mode control circuit includes a first terminal connected to the current source and a second terminal connected to the current sink. The common mode control circuit is operative to selectively control the output common mode voltage of the buffer circuit as a function of the second control signal.

REFERENCES:
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patent: 6329843 (2001-12-01), Hirata et al.
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patent: 6603348 (2003-08-01), Preuss et al.
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patent: 7193443 (2007-03-01), Smith et al.
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patent: 2003/0085737 (2003-05-01), Tinsley et al.
patent: 2007/0024320 (2007-02-01), De Laurentiis et al.

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