Patent ID: 7379520

Claim:
A method of shifting an output phase of a phase rotator between adjacent phase states, the phase rotator having N digital-to-analog converters (DAC) that determine said output phase of the phase rotator wherein N is an integer, comprising: (a) at a k th phase state, activating N/4 adjacent DACs that are indexed as m 0 , m 1 , . . . m ((N/4)−1) ; (b) at a (k+1) th phase state, activating a m (N/4) DAC that is adjacent to said m ((N/4)−1) DAC; and (c) at a (k+2) th phase state, de-activating said m 0 DAC; wherein said k th phase state, said (k+1) th phase state, and said (k+2) th phase state occur sequentially in time each having an equal time duration.