SUMMARYFast, highly accurate A-D converters have recently been required in measurement for wireless communications. The time-interleaved A-D converter, in which multiple highly accurate A-D converters with relatively low speed are combined and are operated by clocks with phase shifts, is known to be effective in the realization of such devices. On the other hand, the following problems have been pointed out. Due to the mismatched characteristics of the A-D converters for the respective channels, the performance of the time-interleaved A-D converter as a whole is degraded. The sampled value is fluctuated by the error in the time domain. In the frequency domain, the spurious level increases, and the spurious-free dynamic range (SFDR) is degraded. In order to reduce the effect of mismatch of characteristics, this paper proposes a method of reducing the nonlinear error contained in the sample values by applying an Estimation Equalizing Technique to the sampled values of the time-interleaved A-D converter, making use of the frequency characteristics of each channel, which are measured by undersampling. The effectiveness of the proposed method is demonstrated by simulation and experiment.
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