Fractional-N synthesizer

摘要

One embodiment of the present invention provides a synthesizer. The synthesizer includes one or more tunable oscillators, a frequency-dividing circuit coupled to the tunable oscillators, and a multiplexer coupled to the frequency-dividing circuit. The frequency-dividing circuit includes a number of frequency dividers, and is configured to generate a number of frequency-dividing outputs. At least one frequency-dividing output has a different frequency division factor. The multiplexer is configured to select a frequency-dividing output.

主权项

1. A synthesizer, comprising:
one or more tunable oscillators configured to generate a radio frequency (RF) signal; a frequency-dividing circuit coupled to the tunable oscillators, wherein the frequency-dividing circuit includes multiple frequency-dividing branches, wherein a respective frequency-dividing branch includes a number of frequency dividers, wherein the frequency-dividing branch is configured to generate a frequency-dividing output of the RF signal, and wherein the multiple frequency-dividing branches are configured to generate different frequency-dividing outputs using different frequency division factors; and a multiplexer coupled to the frequency-dividing circuit, wherein the multiplexer is configured to select, from the different frequency-dividing outputs associated with the different frequency-division factors, a frequency-dividing output.