Circuit for discriminating stray pulses at the input of CMOS circuits

摘要

The invention relates to a simple and cheap discriminator placed upstream of the sensitive input of the circuit in order to eliminate short stray pulses which might occur at this input. The circuit comprises an input stage 10 for charging or discharging a capacitor 12 with a time constant of the same order of magnitude as the minimum duration T0 of the pulses to be discriminated, a trigger TR1 whose input is connected to the capacitor and whose output is connected to the output S of the discriminator, a means Q1 of accelerating the charging of the capacitor and a means Q2 of accelerating the discharging of the capacitor, the means of accelerating the charging being controlled by a first logic gate 16 and the means for accelerating the discharging being controlled by a second logic gate 18, the two gates each having two inputs connected respectively to the input E and the output S of the discriminator circuit. IMAGE