Pll frequency synthesizer

Details Pll frequency synthesizer Pll frequency synthesizer

H - Electricity

03

L

331/39

H03L 7/181 (2006.01) H03L 7/185 (2006.01) H03L 7/199 (2006.01) H03L 7/20 (2006.01)

Patent

CA 1289633

PLL FREQUENCY SYNTHESIZER Abstract of the Disclosure: A PLL frequency synthesizer comprises a voltage controlled oscillator which oscillates in response to a frequency signal corresponding to a control signal to be input and which outputs the frequency signal as an output of said PLL frequency synthesizer; a multiplier means for multiplying a reference frequency signal to be input; a mixer for mixing the frequency signal which is output from the voltage controlled oscillator and the multiplied reference frequency signal which is output from the multiplier, and for outputting a frequency signal representative of a difference therebetween; a variable frequency divider for dividing the difference frequency signal at a variable dividing ratio; a fixed frequency divider for dividing the reference frequency signal at a predetermined dividing ratio; a frequency phase comparator for detecting a phase difference between an output signal from the variable frequency divider and an output signal from the fixed frequency divider and for outputting a phase difference signal therebetween; a filter for removing high frequency components of the phase difference signal which is supplied as the control signal to the voltage controlled oscillator; and a device for switching the polarity of the phase difference signal. An output frequency of the voltage controlled oscillator can be switched to either a frequency higher than or a frequency lower than the frequency which is H (H is a positive integer) times as high as the output frequency of the multiplier, or the output frequency of the voltage controlled oscillator can be switched to either a frequency higher than the frequency which is H times as high as the output frequency of the multiplier or a frequency lower than the frequency which is (H+1) times as high as the output frequency of the multiplier.

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