A new approach for digital calibration of timing-mismatch in four-channels time-interleaved analog-to-digital converters

作者：Majdinasab E; Farshidi E^*

来源：Journal of Instrumentation, 2014, 9(09): T09001.

DOI：10.1088/1748-0221/9/09/T09001

• Data acquisition circuits
• Digital electronic circuits
• Digital signal processing (DSP)
• Analogue electronic circuits

In this paper employing fractional delay filter in farrow structure and a time delay block a new approach for digital calibration is described that corrects the timing mismatch between four interleaved channels. Fractional delay filter is a good candidate for bandlimited interpolation between samples and farrow structure filter is an efficient way to implement interpolation filter in which Lagrange polynomial approximation method is used for arbitrary sample rate change. In this work, the proposed method is employed for a four-channel ADC and can be applied for an arbitrary number of parallel channels. Simulation results show that after 40 ksamples, the mismatch error converges in detector and spurious components are suppressed after calibration by more than 40 dB.

• 出版日期2014-9