| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a filter circuit for improving gain with regard to frequency characteristics of a charge domain second order IIR-LPF. Ž<P>SOLUTION: The filter circuit includes: the flying capacitor which maintains polarity when switching from an input terminal to an output terminal, and the polarity of which is reversed when switching from the output terminal to the input terminal; a first capacitor that is provided in parallel to the flying capacitor, at the input terminal of the flying capacitor; and a second capacitor that is provided in parallel to the flying capacitor, at the output terminal of the flying capacitor. The flying capacitor includes a variable capacity element such that capacity becomes smaller when switching from the input terminal to the output terminal and capacity becomes larger when switching from the output terminal to the input terminal. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
