Amplifiers – With periodic switching input-output
Reexamination Certificate
2007-02-06
2008-11-04
Choe, Henry K (Department: 2817)
Amplifiers
With periodic switching input-output
C330S069000
Reexamination Certificate
active
07446602
ABSTRACT:
Provided are a switched capacitor amplifier capable of removing an influence of an offset voltage and a 1/f noise using a simple circuit, and a method of operating the same.According to the present invention, a switched capacitor amplifier having an operational amplifier and switched capacitors includes: a first switched capacitor one terminal of which is connected with a plus (+) input terminal of the operational amplifier and another terminal of which is applied with an input voltage; a second switched capacitor one terminal of which is connected with a minus (−) input terminal of the operational amplifier and another terminal of which is applied with an input voltage; a third switched capacitor which is inserted between the plus (+) input terminal and a plus (+) output terminal and provided to set an amplification factor in cooperation with the first switched capacitor and store a plus (+) compensation voltage for compensating for an offset, which is applied to the plus (+) input terminal; and a fourth switched capacitor which is inserted between the minus (−) input terminal and a minus (−) output terminal and provided to set an amplification factor in cooperation with the second switched capacitor and store a minus (−) compensation voltage for compensating for an offset, which is applied to the minus (−) input terminal.
REFERENCES:
patent: 4697152 (1987-09-01), Westwick
patent: 4933642 (1990-06-01), Lee
patent: 6169427 (2001-01-01), Brandt
patent: 6940348 (2005-09-01), Confalonieri et al.
patent: 7295143 (2007-11-01), Ambo et al.
Brinks Hofer Gilson & Lione
Choe Henry K
Seiko Instruments Inc.
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