Fractional division frequency synthesizer

Details Fractional division frequency synthesizer Fractional division frequency synthesizer

H - Electricity

03

L

331/62

H03L 7/22 (2006.01) H03L 7/091 (2006.01) H03L 7/197 (2006.01) H03L 7/187 (2006.01)

Patent

CA 1334857

The fractional division frequency synthesizer comprises a digital ramp generator producing a digital correction ramp controlled by a frequency control programmer; a divide by N divider coupled to an output of a voltage controlled oscillator with the divider being controlled by the program, where N is a selected one of an integer and a fraction one or greater; a digital phase detector coupled to a reference clock and the output of the divider to provide a digital phase error signal; a digital adder coupled to an output of the ramp generator and the phase detector to produce a ramp corrected digital phase error signal; and circuit arrangement coupled to an output of the adder and a control input of the con- trolled oscillator to convert the ramp corrected digital phace error signal to a ramp corrected analog phase error signal to control the controlled oscillator and thereby provide a controlled fre- quency signal at the output thereof.

483380

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