| 摘要 |
PURPOSE:To compare the signal from the high impedance signal source in high speed, by providing electronic switch between the input terminals of the differential amplifier. CONSTITUTION:The electronic switch 10 is connected between the input terminals of the differential amplifier and turned on or off with the timing signal 11. With ON state, zero input is given to the differential amplifier 1, then the delay in the comparative operation due to input signal source impedance and parasitic capacitance of the signal line is reduced. If the gain of the differential amplifier 1 is sufficient, the moment when the electronic switch 10 is OFF at the next timing, high or low level is outputted to the output terminal 4. If the timing signal 45 is taken much more than the input signal 21, the differential input waveform 47 is obtained. This is sequentially compared to obtain the output 48 and it is picked up as the latch output 49 with the latch circuit 5. |
