Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2005-05-31
2005-05-31
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S161000, C327S237000, C327S231000, C327S261000
Reexamination Certificate
active
06900679
ABSTRACT:
The digital phase control circuit of the present invention is provided with: voltage-controlled delay line VCDL1in which differential buffers G1-G10having a propagation delay time of 160 ps are concatenated in a plurality of stages; voltage-controlled delay line VCDL2in which differential buffers H1-H8having a propagation delay time of 200 ps are concatenated in a plurality of stages; selector S2that extracts a clock signal from any stage of voltage-controlled delay line VCDL1and outputs to the first stage of voltage-controlled delay line VCDL2; and selector S3that extracts and outputs a clock signal from any stage of voltage-controlled delay line VCDL2. This digital phase control circuit10feedback-controls voltage-controlled delay line VCDL1and voltage-controlled delay line VCDL2by delay locked loops DLL1and DLL2, controls the phases of clock signals with the difference 40 ps between 160 ps and 200 ps as the resolution; and therefore is a power-saving, compact, and high-resolution digital phase control circuit that suppresses increase in power consumption and increase in the area occupied by circuits to a minimum.
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