Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform
Patent
1995-07-28
1996-12-03
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Having specific delay in producing output waveform
327269, 327161, 327277, H03K 513, H03K 700
Patent
active
055812074
ABSTRACT:
An improved high precision synchronous delay line featuring propagation control circuitry in the voltage controlled delay line removing skew between a pair of propagated waveforms. A pair of waveforms are received by the voltage controlled delay line of the synchronous delay line. The voltage controlled delay line features propagation control circuitry which couples together the propagation of the pair of waveforms through the present invention. If a transition from one level to another level occurs on any one of the received pair of waveforms, the propagation control circuitry prevents the transition from propagating until a corresponding transition occurs on the other one of the pair of waveforms. As a result, any skew that is created between the pair of waveforms, for any reason, is removed by the propagation control circuitry. With the skew removed, the presently improved synchronous delay line features increased precision and provides for greater resolution. The present invention also includes an improved wave generator, an improved phase generator, and an improved sample and hold circuit. The present wave generator and phase generator include internal circuitry matched with internal circuitry featured in the present voltage controlled delay line. With the matched internal circuitry, the waveforms propagated through each of the improved elements have uniform transition times which provide the presently improved synchronous delay line with increased precision. The present sample and hold circuit includes phase detection circuitry which provides the present invention with accurate control to maintain the precision of the present synchronous delay line.
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"A Novel Precision MOS Synchronous Delay Line" IEEE Journal of Solid State Circuits, vol. SC-20, pp. 1265-1271, Dec. 1985.
Callahan Timothy P.
Intel Corporation
Shin Eunja
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