| 摘要 |
A method and apparatus create variable delay output from a high-speed trigger input signal. A variable delay generation circuit includes a preconditioning circuit to provide a preconditioned signal in response to an input signal. A delay tap path is coupled to the preconditioned signal to provide a delayed version thereof. The delay path includes a delay element and a scaling circuit. A summing circuit coupled to the delay tap path and preconditioned signal provides an output signal exhibiting variable delay characteristics. The delayed version of the preconditioned signal may be provided by an elongated signal trace between the preconditioning circuit and the delay tap path. Through the combination of summing delayed a nd scaled versions of the input signal and the preconditioning of the input signal to have required rise/fall times and shapes, high-frequency variable delay is implemented providing fast, stable settings with consistent delay range and resolution.< /SDOAB>
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