- on Test & Measurement
- Published in issue 12/2003 on page 0
Spike Detector for Oscilloscopes
Dynamic flip-flops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to capturing noise pulses having unknown durations and magnitudes. Anyone who has ever tried to observe very short laser pulses (15–25 ns) is familiar with this problem.By contrast, this circuit can detect impulses with widths less than 8 ns and amplitudes between +100 mV and +5 V.