| 摘要 |
PROBLEM TO BE SOLVED: To attain over-sampling by dividing a sample/hold circuit into plural sample/hold circuit groups, and adding data held by each sample/hold circuit group by switching one adding circuit. SOLUTION: This filter circuit is provided with a first sample/hold circuit group G1 constituted of plural sample/hold circuits SH11-SH1n, and a second sample/hold circuit group G2 constituted of sample/hold circuits SH21-SH2n. An analog input voltage Vin is inputted in parallel to those sample/hold circuits. First and second adding circuits SUM1 and SUM2 respectively add two outputs from multiplexers MUX2i, and input the added results to a subtracting circuit SUB. The adding circuits SUM1 and SUM2 are commonly used for the first and second groups G1 and G2. Thus, the addition of data held by each sample/ hold circuit group can be attained by switching one adding circuit. |
