Gain amplifier with DC offset cancellation circuit

Details Gain amplifier with DC offset cancellation circuit Gain amplifier with DC offset cancellation circuit

2005-06-07

2005-06-07

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S362000, C327S558000, C330S003000

Reexamination Certificate

active

06903593

ABSTRACT:
A DC offset cancellation circuit employs multiple feedback factors for canceling DC offset by increasing convergence time. The DC offset cancellation circuit features an active low-pass analogue filter including a variable resistor, an amplifier, a capacitor pair and a comparator, the amplifier being coupled to an output of the variable resistor. Negative feedback is provided from the output of the variable resistor to the input signal source, the capacitor pair is coupled to the amplifier, one input of the comparator is coupled to an output of the amplifier, and a second input of the comparator is coupled to a reference voltage source such that a comparison signal is output by the comparator to the variable resistor after comparing the negative feedback signal with a reference voltage.

REFERENCES:
patent: 5798664 (1998-08-01), Nagahori et al.
patent: 5838197 (1998-11-01), Tsukuda
patent: 6288604 (2001-09-01), Shih et al.
patent: 6690225 (2004-02-01), Kondo et al.

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