High resolution delay circuit having coarse and fine delay circu

Details High resolution delay circuit having coarse and fine delay circu High resolution delay circuit having coarse and fine delay circu

1998-03-10

2000-03-14

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327262, 327270, 327265, 327264, 327269, H03K 513

Patent

active

060378182

ABSTRACT:
A delay circuit is to produce a delay timing which is larger than one cycle time of a reference clock while the resolution of which is smaller than the one cycle time of the reference clock. The delay circuit includes a coarse delay circuit for producing a borrow signal having a delay time which is an integer multiple of one cycle time of a clock signal supplied thereto, a divider for dividing the frequency of the reference clock to produce the clock signal, a flip-flop circuit for delaying an incoming signal by one cycle time of the reference clock, a re-timing circuit for receiving an output signal from the flip-flop circuit and producing a coarse delay signal in synchronism with the reference clock, a decoder for receiving the borrow signal from the coarse delay circuit and selectively providing the borrow signal to either the flip-flop circuit or the re-timing circuit, and a fine delay circuit for adding a fine delay time which is smaller than the one cycle time of the reference clock to a coarse delay signal from the re-timing circuit.

REFERENCES:
patent: 4496861 (1985-01-01), Bazes
patent: 4703251 (1987-10-01), Baumgartner et al.
patent: 5570294 (1996-10-01), McMinn et al.
patent: 5594377 (1997-01-01), Choi et al.
patent: 5731725 (1998-03-01), Rothenberger et al.
patent: 5815009 (1998-09-01), Iadanza et al.

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