DC offset cancellation circuit

Details DC offset cancellation circuit DC offset cancellation circuit

2006-11-09

2008-08-12

Lee, Benny (Department: 2817)

Amplifiers

With periodic switching input-output

C327S307000

Reexamination Certificate

active

07411446

ABSTRACT:
A DC offset cancellation block is provided for canceling a DC offset in a signal path. The signal path may include an input and an output. The DC offset cancellation block may include an active integrator coupled between the input and the output to provide a negative feedback to the signal path. The active integrator may include an operational-amplifier (op-amp), a capacitive component with a capacitance C, and a resistive component with a resistance R, and the capacitive component may be coupled to the op-amp via a closed feedback loop. The DC offset cancellation block may also include a first amplifier with a gain of GAcoupled with the capacitive component in the closed feedback loop such that a RC time constant of the active integrator is changed from RC to RCGA.

REFERENCES:
patent: 6442380 (2002-08-01), Mohindra
patent: 6509777 (2003-01-01), Razavi et al.
patent: 6903593 (2005-06-01), Wang
patent: 2004/0251947 (2004-12-01), Wang
patent: 2005/0110550 (2005-05-01), Shi et al.

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