| 摘要 |
PURPOSE:To make high and accurate the response of a negative feedback loop, by changing the power supply voltage of an equalizing circuit the same as an input signal. CONSTITUTION:An input signal applied to a terminal 1 is given to a noninverting input terminal of an operational amplifier A1 and to a gate of an FETTR1. Thus, the source output of the TR1 is subjected to the same voltage change as the input signal and the base input voltage to TRs 3, 4 makes the same voltage change as the input signal. Thus, the same voltage change as the input signal voltage is made to the emitter of the TRs 3, 4, the emitter output is shifted for the level by Zener diodes D1, D2 and applied to the base of TRs 2, 5. Since the TRs 2, 5 is operated at the operating region where the emitter output is subjected to the same voltage change as the base input, the emitter of the TRs 2, 5 is subjected to the same voltage change as the input signal voltage to the terminal 1, allowing the power supply voltages + or -B1 of the operational amplifier A1 to be subjected to the same waveform change in synchronizing with the input signal. |
