DocumentCode :
1463300
Title :
A 12-GS/s 81-mW 5-bit Time-Interleaved Flash ADC With Background Timing Skew Calibration
Author :
El-Chammas, Manar ; Murmann, Boris
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., Stanford, CA, USA
Volume :
46
Issue :
4
fYear :
2011
fDate :
4/1/2011 12:00:00 AM
Firstpage :
838
Lastpage :
847
Abstract :
This paper presents a 12-GS/s 5-bit time-interleaved flash ADC realized in 65-nm CMOS. To improve the dynamic performance at high input frequencies, a statistics-based background calibration scheme for timing skew is employed. The timing skew is detected in the digital domain through a correlation-based algorithm and minimized by adjusting digitally controlled delay lines. In order to minimize power consumption, we employ near minimum size comparators, whose offset is reduced through foreground calibrated trim-DAC circuitry. With the timing calibration activated, the skew-related impairments are reduced by 12 dB at high input frequencies, resulting in an SNDR of 25.1 dB near Nyquist. The prototype IC consumes 81 mW from a 1.1 V supply, yielding a figure-of-merit of 0.35 pJ/conversion-step at low input frequencies, and 0.46 pJ/conversion-step for inputs near Nyquist.
Keywords :
CMOS integrated circuits; analogue-digital conversion; calibration; comparators (circuits); delay lines; digital control; timing circuits; CMOS; background timing skew calibration; calibrated trim-DAC circuitry; comparator; correlation-based algorithm; digital domain; digitally controlled delay line; figure-of-merit; gain 12 dB; gain 25.1 dB; power 81 mW; power consumption; size 65 nm; statistics-based background calibration scheme; time-interleaved flash ADC; voltage 1.1 V; word length 5 bit; Ash; Calibration; Clocks; Correlation; Delay lines; Timing; Transistors; A/D conversion; calibration; flash ADCs; time- interleaving;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2011.2108125
Filename :
5723022
Link To Document :
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