PURPOSE: To realize various characteristics by use of one operational amplifier, by controlling a peripheral capacitor group so that the operational amplifier is used for the time division multiplex.
CONSTITUTION: A time area for controlling a switch is denoted as I0, I1∼I4. A differential variable store SC (switched capacitor) circuit group 30 consists of a capacitor for storing the voltage corresponding to a differential coefficient in each time area, and a switch responding to each time area. An integral feedback SC circuit group 40 stores charge inputted at each time area. The first integral variable store SC circuit group 50 stores the voltage corresponding to charge generated in an output terminal 103. The first addition feedback SC circuit 60 is controlled, for instance, so that the sum total of charge of capacitors C12∼C32 and an input capacitor C0 is stored in a feedback capacitor C4 in the time area I4. Each capacitor is decided from a coefficient obtained by deriving a status equation of Kalman in accordance with a transfer function.
| JPS6454808 | CIRCUIT FOR RECEIVING AND DEMODULATING DATA SIGNAL |
| JPS5985575 | SWITCHED CAPACITOR INTEGRATOR |
YAGUCHI TATSUYA
YAMAMOTO MASAHIRO
MORI SHINSAKU
MORI SHINSAKU