Digital Calibration of DAC Unit Elements Mismatch in Pipelined ADCs

作者：Mafi Hamidreza^*; Yavari Mohammad^*; Shamsi Hossein^*

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2016, 63(1): 34-45.

DOI：10.1109/TCSI.2015.2512700

• Adaptive signal processing
• analog-to-digital converters (ADCs)
• digital calibration
• digital-to-analog converters
• pipelined ADCs

This paper presents a statistics-based digital background calibration technique for digital-to-analog converter (DAC) unit elements mismatch in pipelined analog-to-digital converters (ADCs). The proposed calibration method continuously measures and digitally mitigates sub-DAC (SDAC) mismatch errors in background during the normal data-conversion operation. In this method, the probability density PDF) of the sub-ADC (SADC) quantization error is analyzed using a two-level pseudorandom noise (PN) sequence in order to extract and remove SDAC mismatch errors. Behavioral simulation results are provided for a 12-bit pipelinedADC architecture to validate the effectiveness of the introduced method. Simulation results show that the signal-to-noise and distortion ratio (SNDR) is improved from 48.4 dB to 70.2 dB using the proposed calibration technique. This scheme converges after approximately 30 x 10(6) clock cycles.

• 出版日期2016-1