Pll frequency synthesizer

Details Pll frequency synthesizer Pll frequency synthesizer

H - Electricity

03

L

331/64

H03L 7/18 (2006.01) H03L 7/089 (2006.01) H03L 7/10 (2006.01) H03L 7/183 (2006.01) H04B 1/40 (2006.01)

Patent

CA 1283957

ABSTRACT OF THE DISCLOSURE Disclosed is a frequency synthesizer comprising: a voltage-controlled oscillator (VCO) for generating an oscillation of a frequency varying responsive to a control voltage; a variable frequency divider for dividing the output frequency of the VCO in a ratio according to a control signal; a reference oscillator for supplying a reference signal having a predetermined frequency; a fixed frequency divider for dividing the frequency of the reference signal in a fixed ratio; a phase comparator for comparing the phases of the outputs of the fixed frequency divider and variable frequency divider to provide a control pulse corresponding to a phase difference between these outputs; a charge pump having a power supply terminal for generating a charge/discharge voltage in response to the control pulse; a loop filter including a first capacitor supplied with the charge/ discharge voltage for supplying to the VCO as the control voltage a voltage corresponding to the charge/discharge voltage; and a power supply circuit for generating a D.C. voltage by boosting the voltage of the output of the fixed frequency divider and supplying this D.C. voltage to the charge pump as power voltage.

512487

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