Author:
Qian Lei,Zheng Yanze,Mei Sitao,Sun Sicheng,Xu Huiya,Guo Lianping,Zhao Yijiu
Abstract
Abstract
The time-interleaved analog-to-digital converter (TIADC) is
one of the most effective solutions for improving the sampling rate
of acquisition systems. However, the frequency response mismatch
between channels can seriously degrade the performance of the
system. In this paper, we propose a calibration method for frequency
response mismatches in 4-channel TIADC systems. Following the
construction of a four-channel TIADC model using a four-order
Hadamard matrix, the error signals were extracted using three
time-invariant filters and subsequently subtracted from the output
to complete the calibration. It uses the Hadamard transform instead
of the complex exponential modulator used in conventional
time-varying filter methods, which can further simplify the signal
processing without the necessity of complicated calculations. We
have employed a stimulated four-channel TIADC system to validate the
effectiveness of the proposed calibration technique. Moreover, in a
commercial 12.5 GSPS four-channel TIADC system, it is also
demonstrated that this approach is effective in improving the
spurious-free dynamic range of the system.
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