Movellus Circuits Inc.

Scott Howe

Jeffrey Alan Fredenburg

Xiao Wu

A frequency multiplier circuit includes a first multiplier circuit to generate a first digital value representing a received reference signal having a reference frequency and reference phase, the multiplier circuit to multiply the first digital value by a multiplier value. Comparison circuitry compares the first digital value to an output digital value representing an output signal having an output frequency and an output phase, the comparison circuitry to generate an error signal based on the comparison. A programmable loop filter generates a control signal based at least in part on the error signal. A frequency generation circuit produces the output signal having the output frequency and phase. A phase-to-digital converter generates and feeds the output digital value to the phase comparison circuitry. A programmable transition controller controls a transitioning frequency relationship between a first signal frequency of a first locked output signal and a desired second signal frequency.

Frequency multiplier circuit with programmable frequency transition controller

A frequency multiplier system includes a first frequency multiplier circuit to generate a first signal having a first frequency. The first frequency multiplier circuit includes a first post-divider circuit to divide the first frequency of the first signal to a first output frequency within a bounded first range of frequencies, and a first programmable frequency transition controller to control a transitioning frequency relationship between the first signal having the first frequency and a target signal having a desired target frequency. The system includes a second frequency multiplier circuit to generate a second signal having a second frequency. The second frequency multiplier circuit includes a second post-divider circuit configured to divide the second frequency of the second signal to a second output frequency within a bounded second range of frequencies, and a second programmable frequency transition controller to control a transitioning frequency relationship between the second signal having the second frequency and the target signal having the desired target frequency. A multi-transition controller is coupled to both the first frequency multiplier circuit and the second frequency multiplier circuit to, upon a desired change from the first output frequency to the target output frequency, select one of the first output frequency or the second output frequency as a system output frequency.

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Scott Howe