| 摘要 |
PURPOSE:To perform multiplication and division of high precision for plural input signals by providing a switch means which switches an integrating resistor between the output of an operational amplifier and a signal common and controlling the duty ratio of a pulse signal, which turns on and off the switch means, with plural input signals. CONSTITUTION:An integrating capacitor C and an integrating resistor R are connected in parallel to a feedback circuit of an operational amplifier A1, to which an input signal X is inputted, to constitute an integrator, and a pair of switches S11 and S12 which switch the integrating resistor R between an output E0 of the operational amplifier A1 and the signal common are provided, and a voltage/pulse width converting circuit 10 is provided which varies the duty ratio of the pulse signal, which controls on/off switching of switches S11 and S12, in accordance with input signals Y and Z. Thus, the duty ratio of the pulse signal for on/off switching is varied by plural input signals to execute multiplication/division of input signals. |
