Apparatus for removing DC offset and amplifying signal with...

Details Apparatus for removing DC offset and amplifying signal with... Apparatus for removing DC offset and amplifying signal with...

2007-06-05

2007-06-05

Nguyen, Khanh Van (Department: 2817)

Amplifiers

Sum and difference amplifiers

C330S260000

Reexamination Certificate

active

11115686

ABSTRACT:
An apparatus for removing DC offset and variable gain amplifying simultaneously is provided. A signal voltage level of the output terminal of the first amplifier module is A times that of the first input terminal of the first amplifier module. A voltage level of an output DC offset signal of the first low-pass filter circuit is B times that of the input signal of the first low-pass filter circuit. The output signal of the second amplifier module is a sum of a C1-time amplified first input signal of the second amplifier module and a C2-time amplified second input signal of the second amplifier module, which satisfy the following equation:in-line-formulae description="In-line Formulae" end="lead"?A×B×C1=−C2.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 4873702 (1989-10-01), Chiu
patent: 5748681 (1998-05-01), Comino et al.
patent: 5793230 (1998-08-01), Chu et al.
patent: 5798664 (1998-08-01), Nagahori et al.
patent: 6838935 (2005-01-01), Suzuki
patent: 7023271 (2006-04-01), Aram

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