SINE-WAVE GENERATING CIRCUIT AND FOR APPARATUS DRIVING VIBRATOR EMPLOYING THE SINE-WAVE GENERATING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a sine-wave generating circuit which has a comparatively small circuit constitution and reduces amplitude errors and a distortion rate. SOLUTION: When only a charging current source CC1 is turned on, a capacitor 3 is charged by a constant current I2, and when a charging current source CC2 is additionally turned on, the capacitor 3 is charged by a constant current (I1+I2). Also, when only a discharging current source is turned on, the capacitor 3 is discharged by a constant current I4, and when a discharging current source DC2 is additionally turned on, the capacitor 3 is discharged by a constant current (I3+I4). The constant current is set at I1=I2=I3=I4 and the respective currents are combined, thereby reducing the amplitude errors and the distortion rate of the sine-wave.