PURPOSE: To obtain an attenuation ratio in the speed matched to the sampling period, by controlling the discharge operation frequency dependent upon a discharging circuit according to the attenuation ratio designation signal.
CONSTITUTION: When the input analogue signal is as shwon in figure B, switch SW is turned on temporarily as shown in figure C by the signal from timing control part 5 and is next turned off. Switch SW2 is turned on and off as shown in figure D by the prescribed frequency by the control from discharge control circuit 6. Electric charge of hold capacitor 3 is discharged to the discharge capacitor C2 side for every discharge, and the terminal voltage of capacitor 3 is lowered as shown in figure E. Next, the terminal voltage after discharge of the prescribed frequency is output to terminal 7 through amplifier 9.
MIZUSHIMA KOUJI
YAMAZAWA MASAO
