Patent ID: 7123677

Claim:
A variable sampling data output circuit comprising: a converter portion for sampling an input data signal ( 402 ) by use of an oversampling frequency to output, in parallel, a plurality of fundamental signal series (p 1 , p 2 , p 3 , p 4 ), wherein each of said plurality of fundamental signal series has the same fundamental sampling frequency (fs) but a different phase; and a circular shifter for receiving said plurality of fundamental signal series and outputting a plurality of frequency shift signal series (pH 1 , pH 2 , pH 3 , pH 4 ), wherein the frequency common to each of said plurality of frequency shift signal series is different from the fundamental sampling frequency, and each of said plurality of frequency shift signal series has a different phase; wherein said circular shifter generates the frequency shift signal series by selecting a desired signal sample out of the fundamental signal series according to a count value of a phase shift cumulative counter and a predetermined rule related to the frequency shift; and wherein a desired signal series is obtained by determining whether there is an error in an error detector in relation to at least one fundamental signal series and at least one frequency shift signal series.