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Highly Linear Noise-Shaped Pipelined ADC Utilizing a Relaxed Accuracy Front-End

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2 Author(s)
Rajaee, O. ; Qualcomm Inc., San Diego, CA, USA ; Un-Ku Moon

A noise-shaped pipelined ADC is presented in this paper. A minimal complexity ΔΣ modulator in the first two sub-ADCs and residue feedback in the latter stages lead to high-order noise shaping. This also leads to reduced sensitivity to analog imperfections in the front-end stage. Implemented in 0.18- μm CMOS, the ADC achieves 12 ENOB with 64-MHz clock at 6× OSR while using only a 9-b linear front-end multiplying DAC. The delta-sigma sub-ADCs dissipate 400 μW of extra power (out of 13.9-mW total power) while significantly enhancing the overall ADC linearity.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:48 ,  Issue: 2 )