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Digital Background Calibration in Pipelined ADCs Using Commutated Feedback Capacitor Switching

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3 Author(s)
Nan Sun ; Sch. of Eng. & Appl. Sci., Harvard Univ., Cambridge, MA ; Hae-Seung Lee ; Ham, D.

We propose a new digital background calibration method for capacitor mismatches in pipelined analog-to-digital converters (ADCs). It combines commutated feedback capacitor switching with a background digital correlation loop to extract capacitor mismatch information, which is subsequently used to correct errors caused by the mismatch. This is an all-digital technique requiring minimal extra digital circuits, and is applicable to both single-bit and multibit-per-stage architectures. Simulations with a 15-stage, 1.5-bit-per-stage pipelined ADC with capacitor mismatch of sigma = 0.25% in each stage show that the technique improves signal-to-noise-distortion ratio from 62 dB (10 bits) to 94 dB (15.4 bits).

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:55 ,  Issue: 9 )