Patent ID: 7253762

Claim:
A method for estimating an error of a time-interleaved analog-to-digital converter (ADC), comprising: utilizing a first ADC of the time-interleaved ADC to sample an input signal with a sampling-frequency f 0 to generate a first sampled data; utilizing a second ADC of the time-interleaved ADC to sample the input signal with the sampling-frequency f 0 to generate a second sampled data; respectively converting the first and the second sampled data by a first single-point FFT unit and a second single-point FFT unit according to a frequency component of the input signal to generate a first complex number Z 1 and a second Z 2 complex number, wherein the first complex number Z 1 and the second Z 2 complex number are corresponding to the same frequency; and generating an estimated value of the error according to the first and the second complex numbers.