Patent ID: 7787515

Claim:
An apparatus for spread spectrum rate control comprising: a first interpolator phase interpolating between a first signal and a second signal and generating a first output signal, where the phase interpolation is based on a first control signal; a second interpolator phase interpolating between a third signal and a fourth signal and generating a second output signal, where the phase interpolation is based on a second control signal; a multiplexer selecting, based on a select signal, the first output signal or the second output signal as a spread spectrum clock (SSCLK); and a leap-frog interpolator control generating, in synchronism with the SSCLK, the first control signal based on a first type of phase adjustment request, the second control signal based on a second type of phase adjustment request, and the select signal to switch the multiplexer between the first output signal and the second output signal after allowing for an interpolator settling time when changing the first control signal or the second control signal.