| 摘要 |
PURPOSE:To suppress the switching noise and to obtain an output amplitude equivalent to that of a switch driving system by providing a differential amplifier which receives an input signal, transistors TRs having first and second polarities whose bases the output of this amplifier is received by, and a means which supplies a signal corresponding to collector currents of these TRs to an output terminal. CONSTITUTION:Bases of an NPN TR Q11 and a PNP TR Q12 are coupled to the output of a differential amplifier 11, and a TR Q13 Darlington-connected to a TR Q14 for pull-up is coupled to the TR Q11, and a current source I1 is inserted between the emitter of the TR Q11 and the ground terminal, and the TR Q12 is connected to a power source Vcc through a diode D10, and its collector is connected to the base of a TR Q15 Darlington-connected to a TR Q16 for pull-down, and the collector of a TR Q17 is connected to the diode D10, and its emitter is connected to the emitter of the TR Q11, and a resistance R5 is inserted between the base and the collector of the TR Q17, and a current source 12 is inserted between the base and the ground. An output signal is taken out from the series connection point between TRs Q14 and Q16, and the signal output is fed back to the amplifier 11 through a resistance R4. Since this circuit is in the analog driving system using The differential amplifier, a large output amplitude free from noise is obtained. |
