In this paper, we present a digital background calibration technique for pipelined analog-to-digital converters (ADCs). In this scheme, the capacitor mismatch, residue gain error, and amplifier nonlinearity are measured and then corrected in digital domain. It is based on the error estimation with nonprecision calibration signals in foreground mode, and an adaptive linear prediction structure is used to convert the foreground scheme to the background one. The proposed foreground technique utilizes the LMS algorithm to estimate the error coefficients without needing high-accuracy calibration signals. Several simulation results in the context of a 12-b 100-MS/s pipelined ADC are provided to verify the usefulness of the proposed calibration technique. Circuit-level simulation results show that the ADC achieves 28-dB signal-to-noise and distortion ratio and 41-dB spurious-free dynamic range improvement, respectively, compared with the noncalibrated ADC.
This paper presents a digital background calibration technique to correct the capacitors mismatch, gain error and gain nonlinearities of 1.5 bit/stage pipelined ADCs. The calibration technique uses a modified structure for the ADC stages, the skip-fill method and LMS algorithm and does not require any accurate calibration signal and any added analog circuitry; just some digital circuits are needed to fill the skipped samples and realize the LMS algorithm. Circuit level simulation results in a 90-nm CMOS technology are provided for a 12-bit 80-MS/s pipelined ADC to verify the effectiveness of the proposed calibration technique. Keywords: pipelined ADCs, capacitor mismatch, gain error, amplifier nonlinearity, digital background calibration, skip-fill method Classification: Integrated circuits
References[1] C. Grace, P. J. Hurst, and S. H. Lewis, "A 12-bit 80-MSample/s pipelined ADC with bootstrapped digital calibration," IEEE J. Solid-State Circuits, vol. 40, no. 5, pp. 1038-1046
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