Title :
A reconfigurable 10–12b 0.4–44MS/s pipelined ADC with 0.35–0.5pJ/step in 1.2V 90nm digital CMOS
Author :
Taherzadeh-Sani, Mohammad ; Hamoui, Anas A.
Author_Institution :
Dept. of Electr. & Comput. Eng., McGill Univ., Montreal, QC, Canada
Abstract :
This pipelined ADC is reconfigurable over sampling frequencies of 0.4-44 MS/s and resolutions of 10-12 bits, thus targeting multi-standard wireless terminals. Fabricated in 1.2-V 90-nm digital CMOS, it achieves a competitive FOM of 0.35-0.5 pJ/conversion step over its wide reconfigurability space. For power scalability, the ADC bandwidth and resolution are reconfigured using current-scaling and stage-bypass methods, respectively. The following techniques are also introduced to achieve this low-power performance for the ADC over its wide reconfigurability space, and to enable its implementation in low-voltage nanometer CMOS: 1) pseudo-cascode compensation for the low-power design of low-voltage current-scalable opamps; 2) design of switched-capacitor dynamic comparators with low input loading; 3) low-power digital background gain calibration to enable designing the ADC using low-gain/low-power opamps.
Keywords :
CMOS integrated circuits; analogue-digital conversion; comparators (circuits); low-power electronics; operational amplifiers; pipeline arithmetic; reconfigurable architectures; ADC bandwidth; current-scaling; digital CMOS; low input loading; low-gain opamps; low-power design; low-power digital background gain calibration; low-power opamps; low-voltage current-scalable opamps; low-voltage nanometer CMOS; multistandard wireless terminals; power scalability; pseudo-cascode compensation; reconfigurable pipelined ADC; sampling frequency; size 90 nm; stage-bypass methods; switched-capacitor dynamic comparators; voltage 1.2 V; Bandwidth; CMOS integrated circuits; Calibration; Frequency measurement; Pipelines; Switches; Switching circuits;
Conference_Titel :
ESSCIRC, 2010 Proceedings of the
Conference_Location :
Seville
Print_ISBN :
978-1-4244-6662-7
DOI :
10.1109/ESSCIRC.2010.5619723