Capacitance can produce delays that have the role of the circuit after a period of time the signal word may also use its energy storage role in accelerating the pace of change associated circuitry, as shown in Figure 7-42 (a) shows the capacitance of the circuit shall be a role to accelerate the application of .
Figure 7-42 (a) shows a typical inverter circuit, Ri VT for the transistor base input resistance, R2 is the VT of the transistor base bias resistor (connected - Ec guarantee VT reliable cut-off), R3 for the transistor collector load resistors, capacitors, capacitor C is accelerated.
as transistors operate as switches, in parallel with capacitor C R1 shield, because the voltage across the capacitor can not change suddenly, because of the input signal after the leading edge along the current and
54 datasheet and fast current changes, ie d / / dt pole large, will be the input pulse leading edge and
54 price and trailing edge produces differential effects of the formation of spikes, the waveform shown in Figure 7-42 (b) below. This allows the transistor switching speed, quick access to on-and off state. As can be seen from the waveform, because the differential capacitance of the role of the A point along the waveform before and
54 suppliers and after the spike, they were play-and off-speed transistors role. You should also see point A waveform amplitude than the input waveform amplitude Ul small, then because the parallel resistance Ri of the buffer effect due to pressure drop. Capacitance derivative action in accelerating the completion of the input waveform had entered a stable state, this time for the DC input signal, capacitor failure, the equivalent open circuit, the input signal through the resistance, pressure drop that U2
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