Amplifiers – With periodic switching input-output
Reexamination Certificate
2005-02-08
2005-02-08
Choe, Henry (Department: 2817)
Amplifiers
With periodic switching input-output
C330S069000, C327S124000
Reexamination Certificate
active
06853241
ABSTRACT:
In the hold phase, two negative feedback circuits constituted by the negative feedback capacitors6pand6mand two positive feedback circuits constituted by positive feedback capacitors are provided between an input terminal and an output terminal of an operational amplifier. Here, in a sampling phase before a hold phase, charges according an input signal V1pis stored in each of the capacitors, and charges according to an input signal V1pare stored in each of the capacitors. As a result, a gain of the switched capacitor amplifier circuit is derived from (Ca+C)/(Ca−Cx) wherein Ca indicates an electrostatic capacitance of the negative feedback capacitors, and Cx indicates an electrostatic capacitance of the positive feedback capacitors, and thus the gain can be increased without significantly increasing an electrostatic capacitance ratio.
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Birch & Stewart Kolasch & Birch, LLP
Choe Henry
Sharp Kabushiki Kaisha
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