| 摘要 |
<p>PURPOSE:To always keep the gain of a closed loop to a constant characteristic, and to compensate load fluctuation by receiving the output of a differential amplifier, which detects the differential signal between a signal outputted from a first detecting circuit and a signal outputted from a second detecting circuit, and amplifying an error signal according to the output. CONSTITUTION:A detecting reference signal superimposed to the error signal of the closed loop is amplified by a closed loop gain, then detected by a second detecting circuit 4. The differential signal between the signal outputted from the second detecting circuit 4 and the signal outputted from a first detecting circuit 3, which detects the output of a detecting reference signal generating circuit 1 as it is, is detected by a differential amplifier 5, and thus the closed loop gain is detected. When the differential signal is outputted from the differential amplifier 5 to a differentiating circuit, the error signal is amplified according to the closed loop gain. Thus the closed loop gain can be always set to the constant characteristic, and the load fluctuation can be compensated.</p> |
