Digital control variable delay circuit which is hardly...

Details Digital control variable delay circuit which is hardly... Digital control variable delay circuit which is hardly...

2005-05-03

2005-05-03

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C327S269000, C327S274000, C327S276000, C327S280000

Reexamination Certificate

active

06888389

ABSTRACT:
A digital control variable delay circuit includes n amplitude control units which are connected in parallel and each of which receives a pair of input clock signals to be supplied to a differential pair and receives m-bit digital control signals, and a waveform shaping unit which is connected to the outputs of the n amplitude control units. Each amplitude control unit is capable of varying the amplitude of each of the pair of clock signals into (m+1) values using the m-bit digital control signals, and outputs a pair of amplitude-varied clock signals. The waveform shaping unit receives a pair of added clock signals obtained by adding and combining the pairs of amplitude-varied clock signals outputted from the n amplitude control units and outputs a pair of resultant clock signals as output signals.

REFERENCES:
patent: 5554945 (1996-09-01), Lee et al.
patent: 5734284 (1998-03-01), Popescu
patent: 63-31214 (1988-02-01), None
patent: 6-152343 (1994-05-01), None
patent: 9-214334 (1997-08-01), None
patent: 9-512965 (1997-12-01), None
patent: 11-284497 (1999-10-01), None

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