Noise suppressor and pulse shaper - has inverter between input differentiator and output integrator to compensate for noise

摘要

The pulse shaper suppresses noise and shapes pulses (Trigger and signal pulses) used in motor vehicle diagnostic equipment and does so with few components and a relatively high input impedance. The input signal, e.g. from an ignition coil (10) and breaker (11), passes over an input circuit (13, 15) to a differentiator (22, 23). The differentiator is coupled to an inverter (20) that produces a signal to compensate for noise and passes it to an integrator (17) at the output of the pulse shaper. The differentiator is coupled via a diode (25) to a capacitor (24) connected in parallel with the input circuit.