A signal generator 600 includes oscillator circuitry for generating first and second signals having a selected phase relationship and an interpolator 610 for interpolating between a phase of the first signal and a phase of the second signal to generate a third signal having a phase between the phases...http://www.google.com/patents/US6369661?utm_source=gb-gplus-sharePatent US6369661 - Phase interpolation circuits and methods and systems using the same
