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

作者：Matsuno Junya^*; Yamaji Takafumi; Furuta Masanori; Itakura Tetsuro

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2013, 60(5): 1113-1121.

DOI：10.1109/TCSI.2013.2249176

• ADC
• all-digital background calibration
• derivative filter
• fixed FIR
• Hadamard transform
• pseudo aliasing signal
• time-interleaved

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.

• 出版日期2013-5