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EDN Access — 07.18.96 Delay line implements clock doubler

-July 18, 1996

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Design Ideas:July 18, 1996

Delay line implements clock doubler


Y Li,
SAE magnetics (HK) Ltd, Guang Dong Province, China

Timing delays are undesirable in most digital circuits. However, in some cases, delays can be useful—to deal with a µP-speed-compatibility issue, for example. The circuit in Figure 1a uses a silicon T/4 delay line and an XOR gate to implement a simple clock doubler. Using a 5-nsec delay unit, a 50- MHz, 50% duty-cycle square-wave input produces a 100-MHz, 50% duty-cycle output clock.

Using a more precise delay line, the circuit can output a triple clock (Figure 1b). The MSD1000 series of silicon delay lines from Maxim Integrated Products (Sunnyvale, CA) provides 5- to 500-nsec delays with nominal accuracies of ±5%. The manufacturer can also customize standard delays to meet special needs. (DI #1899)


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