Frequency synthesizer with a phase-locked loop with multiple...

Details Frequency synthesizer with a phase-locked loop with multiple... Frequency synthesizer with a phase-locked loop with multiple...

H - Electricity

03

L

H03L 7/18 (2006.01) H03K 23/66 (2006.01) H03K 23/68 (2006.01) H03L 7/197 (2006.01)

Patent

CA 2049582

A frequency synthesizer comprises a single phase-locked loop controlled by a reference clock formed by a voltage-controlled oscillator, a programmable divider with variable division rank M, a phase detector, and a loop filter. It also comprises a predetermined number n of fractional division structures, each implementing a frequency step P i x F ref lower than the reference frequency F ref. Each fractional structure is coupled in parallel with said programmable divider to add to said division rank M fractional increments P i such that the ratio between the frequency F vco provided by said oscillator and said reference frequency be defined as a function of said increments P i by the relationship : (see fig. I) Application : any type of product or system requiring a frequency synthesizer, in particular communications system with frequency agility.

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