| 摘要 |
<p>PROBLEM TO BE SOLVED: To generate a pulse width modulation signal having fewer distortion components and independent of common mode noise and an offset voltage.SOLUTION: The operation of charging an integration circuit 3 with a current i=I+Δi (Δi=G*|e|) for a predetermined time t and subsequently discharging it at a constant current and the operation of charging an integration circuit 4 with a current i=I-Δi for the time t and subsequently discharging it at the constant current are alternately performed at a period 2*t with a shift of the time t therebetween. Pulse signal generation circuits 6, 7 generate pulse signals S1, S2 of pulse widths equivalent to discharge times t1, t2 of the integration circuits 3, 4, respectively, and a PWM signal generation circuit 8 detects discharge end timings of the integration circuits 3, 4 on the basis of the pulse signals S1, S2, and generates a pulse of a pulse width equivalent to a time from the discharge end timing of the integration circuit 4 to the discharge end timing of the integration circuit 3 and outputs it as a PWM signal S.</p> |
