Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

H - Electricity

03

L

H03L 7/18 (2006.01) H03J 7/06 (2006.01) H03L 7/081 (2006.01) H03L 7/10 (2006.01)

Patent

CA 2120184

A frequency synthesizer, which realizes speed-up of channel switching between channels having separated frequencies, has an EEPROM which stores the phase difference between a first frequency divider and a second frequency divider producing outputs corresponding to the frequencies of the channels to be switched. A delay circuit delays the output of the second frequency phase divider by an amount corresponding to an amount of the phase difference stored in the EEPROM. A controller supplies the outputs of the second frequency divider and the delay circuit to a phase detector. Further, the controller stops a PLL operation and restarts it in synchronism with a leading edge of, preferably, a second period of the output signal of the reference oscillator to which the preset phase difference is given.

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