Error analysis for time-interleaved analog channels

Time-interleaved architectures are frequently employed in high-speed data converters and signal processing channels in order to achieve the highest possible speed. However, the performance of the combined channels is reduced if each channel is not well matched in terms of gain, converter offset and timing skew. In this paper, the errors introduced by gain and offset mismatch and timing skew is analyzed in detail. The digital spectra due to mismatch between channels is derived by applying digital signal processing theories and the closed-forms of signal-to-noise ratio (SNR) are derived and verified using Matlab^TM