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LT1721IGN Datasheet(PDF) 23 Page - Linear Technology |
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LT1721IGN Datasheet(HTML) 23 Page - Linear Technology |
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23 / 28 page  LT1720/LT1721 23 17201fc APPLICATIONS INFORMATION Coincidence Detector High speed comparators are especially suited for interfac- ing pulse-output transducers, such as particle detectors, to logic circuitry. The matched delays of a monolithic dual are well suited for those cases where the coincidence of two pulses needs to be detected. The circuit of Figure 19 is a coincidence detector that uses an LT1720 and discrete components as a fast AND gate. The reference level is set to 1V, an arbitrary threshold. Only when both input signals exceed this will a coincidence be detected. The Schottky diodes from the comparator outputs to the base of the MRF-501 form the AND gate, while the other two Schottkys provide for fast turn-off. A logic AND gate could instead be used, but would add considerably more delay than the 300ps contributed by this discrete stage. This circuit can detect coincident pulses as narrow as 3ns. For narrower pulses, the output will degrade gracefully, responding, but with narrow pulses that don’t rise all the way to “high” before starting to fall. The decision delay is 4.5ns with input signals 50mV or more above the refer- ence level. This circuit creates a TTL compatible output but it can typically drive CMOS as well. For a more detailed description of the operation of this circuit, see Application Note 75, pages 10 and 11. Figure 19. A 3ns Coincidence Detector 5V 3.9k 1k 0.1μF 51Ω 51Ω 300Ω 300Ω 5V 5V 4 1N5711 MRF501 OUTPUT GROUND CASE LEAD COINCIDENCE COMPARATORS 300ps AND GATE 17201 F19 1/2 LT1720 – + 1/2 LT1720 |
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