Device for DC offset cancellation

Details Device for DC offset cancellation Device for DC offset cancellation

2006-09-26

2006-09-26

Cunningham, Terry D. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S067000, C330S259000

Reexamination Certificate

active

07113016

ABSTRACT:
A DC offset cancellation device is provided, including a baseband circuit, a common mode feedback (CMFB) circuit, a low-pass filter (LPF), and an amplifier. The CMFB circuit is used to set a specific common mode DC voltage in a differential circuit; thus, the CMFB circuit can be used for detecting the common mode voltage of a differential circuit, and force the voltage to a specific value by using a feedback control. Because the size of a typical CMFB circuit is much smaller than the size of an LPF, the final size of the one-LPF device is smaller than the conventional design using two LPFs.

REFERENCES:
patent: 6690225 (2004-02-01), Kondo et al.
patent: 6704560 (2004-03-01), Balteanu et al.
patent: 6784698 (2004-08-01), Brenden
patent: 6992526 (2006-01-01), Cheng
patent: 2002/0163384 (2002-11-01), Hasegawa
patent: 2004/0207470 (2004-10-01), Van Zanten

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