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要检测方波信号的边缘,一般采用微分电路与逻辑电路,微分电路要外附电阻、电容和二极管等分立元件,抗干扰能力差。采用数字电路作边缘脉冲检测,电路简单,工作可靠。(一)时钟同步的边缘检测器在具有高速时钟信号的数字电路中,可采用触发器配合逻辑门电路把方波边缘转换成脉冲,见图1。图示的电路中采用上升沿触发的D触发器,波形④为上升沿转换的脉冲方波;波形⑤为下降沿转换的脉冲波;波形⑥为上升沿和下降沿合成输出的波形。④、⑤、⑥各端输出的脉冲波宽度为1个时钟周期,它与时钟同步。
To detect the edge of the square wave signal, the general use of differential circuits and logic circuits, differential circuit to be attached to resistors, capacitors and diodes and other discrete components, anti-interference ability is poor. Using digital circuit for edge pulse detection, the circuit is simple and reliable. (A) clock synchronization of the edge detector In a digital circuit with high-speed clock signal, the trigger can be used with the logic gate circuit to convert the square wave edge into a pulse, shown in Figure 1. The circuit shown in the figure uses a D flip-flop triggered by a rising edge, a waveform ④ is a square wave converted from a rising edge, a waveform ⑤ is a pulse converted from a falling edge, and a waveform ⑥ is a synthesized output waveform from a rising edge to a falling edge. ④, ⑤, ⑥ each end of the output pulse width of 1 clock cycle, it is synchronized with the clock.