Patent ID: 7035367

Claim:
A fractional multi-modulus prescaler comprising: a polyphase filter having an input for receiving an input frequency signal and for producing one or more output phase signals each of said one or more output phase signals having the same frequency as the polyphase filter input frequency signal and a phase difference of 90 degrees relative to one another; a multiplexer coupled to said polyphase filter for selecting said one or more output phase signals in response to a multiplexer control signal; an asynchronous divide-by-N divider coupled to said multiplexer and having an input for receiving said one or more multiplexer selected output phase signals and for generating an output frequency signal; a phase control for generating said multiplexer control signal in response to the presence of an input D-CTRL word signal, a MOD signal and a feedback signal generated by said divide-by-N divider, whereby the frequency of said divide-by-N divider output frequency signal is a desired fractional multiple of the frequency of said input frequency signal.