PURPOSE: To increase the dynamic range, by providing the capacitor with the integrator every plurality of input terminals and each input terminal.
CONSTITUTION: When the level characteristics to each integrator are changed from the input without changing the entire filter characteristics, the coefficient of the second integrator driven with the first integrator is required to be changed toward opposite value with the same ratio. A plurality of input terminals of the integrator A are provided with the capacitors CX11∼CX53 and analog switches SW1∼SW32 driven with two-phase clock pulse. For example, the relation of CX11=α1.CX1 is in existence among the integration capacitor of the integrator A1, input capacitor, and integration coefficient. Accordingly, the characteristics of the integrator can arbitrarily be decided with CX11 and the dynamic range can be extended by adjusting the level characteristics.
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SHIDA SEIYA
IWATA ATSUSHI
KATOU SEIJI
NIPPON TELEGRAPH & TELEPHONE
FUJITSU LTD
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS=1978