Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1997-02-10
1998-07-14
Nelms, David C.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327235, 375373, 375374, 375376, H03D 318
Patent
active
057810540
ABSTRACT:
The present invention relates to a digital phase correcting apparatus, including a phase comparator (100), a loop filter (110), and a digital controlled oscillator (120). The digital controlled oscillator (120) includes a phase clock signal generator (400), a multiplexer (410), an up/down counter (430), and a frequency divider (420). The phase clock signal generator (400) receives the master clock signal as an input and generates therefrom a plurality of clock signals having a phase difference of half a period of the master clock signal. The multiplexer (410) selects and outputs one of the clock signals generated in the phase clock signal generator (400). The up/down counter (430) receiving a phase lead/lag signal of the loop filter (110) and provides an output select signal for the multiplexer (410). The frequency divider divides the frequency of the clock signal output from the multiplexer and outputting the phase locked clock signal to the phase comparator. According to the present invention, it is possible to improve the degree of precision and the jitter characteristics of the PLL by a factor of two since the phase locked clock signal can be changed by a unit of a half period of the master clock signal.
REFERENCES:
patent: 4600895 (1986-07-01), Landsman
patent: 4654864 (1987-03-01), Ichiyoshi
patent: 5012198 (1991-04-01), Okada et al.
patent: 5268936 (1993-12-01), Bernardy
patent: 5271040 (1993-12-01), Clark
Le Vu A.
Nelms David C.
Samsung Electronics Co,. Ltd.
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