Method and apparatus for AC coupling

Details Method and apparatus for AC coupling Method and apparatus for AC coupling

1995-08-30

1997-07-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327352, 327361, H03K 1716

Patent

active

056465696

ABSTRACT:
AC coupling is effected by a feedback circuit that detects a DC component in the coupled signal, and adjusts a DC subtraction signal accordingly. In one embodiment, a digital signal processor (DSP) analyzes the coupled signal for a remaining DC component, and controls the subtraction signal. Use of a DSP allows dynamic control of parameters including AC cutoff frequency, gain, and transfer function. Another embodiment provides accurately phase matched AC coupling across two or more signal channels.

REFERENCES:
patent: 3800236 (1974-03-01), Riethmuller et al.
patent: 3953805 (1976-04-01), Couvillon
patent: 4140925 (1979-02-01), Meyer
patent: 4229703 (1980-10-01), Bustin
patent: 4377759 (1983-03-01), Ohhata et al.
patent: 4430622 (1984-02-01), Simoes
patent: 5241702 (1993-08-01), Dent
patent: 5389839 (1995-02-01), Heck
patent: 5471244 (1995-11-01), Wolfe
patent: 5477183 (1995-12-01), Hayes
Burr-Brown IC Data Book--Linear Products, 1995, pp. 4.31, 4.63, 4.73, 4.174, 4.187.

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