The pulse width detection circuit 555

As shown in Fig pulse-width detection circuit. The detection circuit by the differential circuit (R2, C2), amplifier BG1, single stabilizing circuit (555, R1,
The pulse width detection circuit 555 - schematic

C1) and other components. Pulse signal Vin (such as a wave A) all the way to add to the input differential amplifier circuit, another path R4 is added to the collector circuit BG2. By the negative-going pulses (such as waveform B) trigger circuit 555 is set to a certain output pin positive pulse width (such as waveform C) after the differential amplifier, which is the one-shot pulse circuit timing td 1.1 R1C1 (seconds), and the positive pulse is applied to the base of BG2, so during detection, BG2 saturated conduction, the collector (ie, the circuit output V0) was low. If they are detected pulse width greater than the set width td, due to the collector BG2 pressing for longer than the base bias time td, V0 appear high, indicating that the detected pulse width exceeds a set time.

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