Method and apparatus for a direct current (DC) coupled input...

Details Method and apparatus for a direct current (DC) coupled input... Method and apparatus for a direct current (DC) coupled input...

2006-06-14

2008-10-14

Chang, Daniel D (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C330S260000, C330S069000, C327S108000

Reexamination Certificate

active

07436216

ABSTRACT:
A method and apparatus for combining an alternating current (AC) coupling technique with a low frequency restoration technique to provide AC coupling with low frequency restoration of the attenuated low frequency content. The low frequency restoration circuit operates to extract low frequency information prior to being high-pass filtered by the AC coupling circuit. The low frequency restoration circuit then buffers the low frequency information through a low frequency restoration amplifier, applies a programmable common mode voltage to the buffered, low frequency information, and then restores the buffered, common mode adjusted, low frequency information to the output of the AC coupling circuit.

REFERENCES:
patent: 4320351 (1982-03-01), Brown et al.
patent: 5300896 (1994-04-01), Suesserman
U.S. Appl. No. 10/659,971, filed Sep. 11, 2003, Boecker et al.

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