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A Digital-Calibration Technique for Redundant Radix-4 Pipelined Analog-to-Digital Converters

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3 Author(s)
Masanori Furuta ; Shizuoka Univ., Hamamatsu ; Shoji Kawahito ; Daisuke Miyazaki

This paper describes a digital-calibration technique, which corrects gain errors due to capacitor mismatch and offset errors due to charge injection in redundant radix-4 pipelined analog-to-digital converters (ADCs). The error coefficients are directly measured using an integral nonlinearity (INL) plot. The proposed method simplifies the error-measurement process and removes on-chip measurement circuits in the ADC. Computer simulations show that the maximum INL of 15 LSB in an uncalibrated 15-bit ADC is reduced to less than 0.3 LSB using the digital calibration.

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:56 ,  Issue: 6 )