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All-Digital Background Calibration Technique for Time-Interleaved ADC Using Pseudo Aliasing Signal

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4 Author(s)
Matsuno, J. ; Corp. R&D Center, Toshiba Corp., Kawasaki, Japan ; Yamaji, T. ; Furuta, M. ; Itakura, T.

A new digital background calibration technique for gain mismatches and sample-time mismatches in a Time-Interleaved Analog-to-Digital Converter (TI-ADC) is presented to reduce the circuit area. In the proposed technique, the gain mismatches and the sample-time mismatches are calibrated by using pseudo aliasing signals instead of using a bank of adaptive FIR filters which is conventionally utilized. The pseudo aliasing signals are generated and subtracted from an ADC output. A pseudo aliasing generator consists of the Hadamard transform and a fixed FIR filter. In case of a two-channel 10-bit TI-ADC, the proposed technique reduces the requirement for a word length of the FIR filter by about 50% without a look-up table (LUT) compared with the conventional technique. In addition, the proposed technique requires only one FIR filter compared with the bank of adaptive filters which requires (M-1) FIR filters in an M-channel TI-ADC.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:60 ,  Issue: 5 )