| 摘要 |
Amplifier includes an integrator (2) supplied with an input signal to be pulse-width modulated and a carrier signal from a carrier signal oscillator(3), a comparator (4) connected to the output of the integrator (2) producing a pulse width modulated signal, an output amplifier (6) and a negative feedback circuit connected between the input of the integrator (2) and the output of the amplifier (6). The negative feedback circuit becomes effective by means of a switch (S1) closing after a predetermined time from the time when the power source + VCC becomes ON so as to avoid oscillation of the closed loop including the integrator (2).
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