Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

H - Electricity

03

L

331/58

H03L 7/18 (2006.01) H03K 23/66 (2006.01) H03L 3/00 (2006.01) H03L 7/08 (2006.01) H03L 7/10 (2006.01) H03L 7/14 (2006.01) H03L 7/197 (2006.01) H03L 7/199 (2006.01)

Patent

CA 1290407

27341-10 ABSTRACT This invention aims at offsetting a phase difference caused by a delay in a frequency synthesizer which is intermittently actuated for power reduction by setting the division ratio at two levels at the time of releasing reset signals at the variable frequency divider so that the delay time is adjusted by the fre- quency division in the first cycle. The synthesizer sets the ordinary division ratio in the second cycle and thereafter, and if there is still a phase difference, it sends reset signals again to the variable frequency divider repeating the aforemen- tioned operations. This frequency synthesizer can realize an ideal intermittent operation without significant frequency fluc- tuation by repeating the above operations to reduce the phase difference at the variable frequency divider to one cycle of the input signals of the counter or less (e.g. about 1.3 nsec in 800 MHz).

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