| 摘要 |
An LPF (15) includes a plurality of capacitors (C1) to (Cn) connected in parallel, switches (SW11) to (SW1n) and (SW21) to (SW2n) for carrying out switching to perform their charging/discharging operation as a pipeline processing, and a capacitor (CH) connected to an output side of a parallel circuit having the capacitors (C1) to (Cn), and electric charges stored sequentially in the capacitors (C1) to (Cn) are obtained as an output of the parallel circuit and are sequentially stored in the capacitor (CH). Consequently, it is possible to implement a great time constant as the whole circuit even if the time constant is reduced with a decrease in capacitance values of the capacitors (C1) to (Cn) and (CH).
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