Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2007-03-13
2009-06-02
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S279000, C327S291000
Reexamination Certificate
active
07541853
ABSTRACT:
A phase interpolator receives an input clock signal and varies the phase of an output clock signal in accordance with a phase control signal. An SSC controller, which generates the phase control signal applied to the phase interpolator, includes a pre-divider for outputting a frequency-divided clock obtained by frequency-dividing the input clock signal by a prescribed dividing value; a first counter receiving the frequency-divided clock from the frequency divider and repeatedly up-counting and down-counting by a predetermined first count, the first counter having a state machine for holding the present state; a second counter receiving the output signal of the first counter and repeatedly up-counting and down-counting by a predetermined second count, the second counter having a state machine for holding the present state; and a controller receiving the frequency-divided clock from the frequency divider, the counts from the first and second counters and the state of the second counter, and outputting a down signal, which retards the phase of the output clock signal, based upon the count values and states of the first and second counters at a timing decided by the frequency-divided clock. In the repetition of the counting operation of the first counter, the controller uses the same combinational logic. The controller has an inversion control circuit for inverting the signal when the states of the counters are predetermined prescribed states.
REFERENCES:
patent: 5812831 (1998-09-01), Crocker
patent: 6112309 (2000-08-01), Inoue et al.
patent: 2004/0252751 (2004-12-01), Ogasawara
patent: 2005-004451 (2005-01-01), None
Foley & Lardner LLP
NEC Electronics Corporation
Wells Kenneth B.
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