| 摘要 |
PURPOSE:To operate correctly a titled circuit even at the time of a sudden change of a level of an input signal, also at the time of rise of the input signal and at the time of fall of the input signal, or the like, by eliminating a variation of an output signal level due to a transient response. CONSTITUTION:An output level detecting signal from an output level detecting circuit 4 is amplified by an amplifier 8, and thereafter, a capacitor 7 is charged through a diode 6, and also the capacitor 7 is charged through a switching circuit 10 having a bi-directional property, which is driven by a gate signal generating circuit 11 operated by the output level detecting signal. Subsequently, charging voltage of this capacitor 7 is compared with reference voltage by a controlling circuit 5 so that the gain of an amplifier 1 is controlled. The gate signal generating circuit 11 starts a generating operation of a gate signal in response to the time point of rise of the output level detecting signal from the output level detecting circuit 4, and ends the generating operation of said data signal at the time point which is earlier than the time point of fall of the output level detecting signal concerned. |
