Title :
A Programmable 0.8-V 10-bit 60-MS/s 19.2-mW 0.13-
m CMOS ADC Operating Down to 0.5 V
Author :
Choi, Hee-Cheol ; Kim, Young-Ju ; Yoo, Si-Wook ; Hwang, Sun-Young ; Lee, AndSeung-Hoon
Author_Institution :
Sogang Univ., Seoul
fDate :
4/1/2008 12:00:00 AM
Abstract :
This work describes a programmable 10- to 100-MS/s, low-power 10-bit two-step pipeline analog-digital converter (ADC) operating at a power supply from 0.5- to 1.2-V. MOS transistors with a low-threshold voltage are employed partially in the input sampling switches and differential pair of the SHA and MDAC for a proper signal swing margin at a 0.5-V supply. The integrated adjustable current reference optimizes the static and dynamic performance of amplifiers at 10-bit accuracy with a wide range of supply voltages. A signal-isolated layout improves the capacitor mismatch of the multiplying digital-to-analog converter, while a switched- bias power-reduction technique reduces the power dissipation of comparators in the flash ADCs. The prototype ADC in a 0.13-mum CMOS process demonstrates the measured differential nonlin- earity and integral nonlinearity within 0.35 and 0.49 least significant bits. The ADC, with an active die area of 0.98 mm2, shows a maximum signal-to-noise distortion ratio and spurious free dynamic range of 56.0 and 69.6 dB, respectively, and a power consumption of 19.2 mW at a nominal condition of 0.8 V and 60 MS/s.
Keywords :
CMOS integrated circuits; MOSFET; analogue-digital conversion; comparators (circuits); CMOS ADC; MOS transistors; capacitor mismatch; comparators; differential nonlinearity; integral nonlinearity; integrated adjustable current reference; multiplying digital-to-analog converter; power 19.2 mW; power dissipation; sampling switches; signal-isolated layout; signal-to-noise distortion ratio; size 0.13 mum; switched- bias power-reduction technique; two-step pipeline analog-digital converter; voltage 0.5 V to 1.2 V; Adjustable current; CMOS; analog-to-digital converter (ADC); low voltage; programmable;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2008.918989