Title :
Time-Interleaved Analog-to-Digital Conversion With Online Adaptive Equalization
Author :
Liu, Wenbo ; Chiu, Yun
Author_Institution :
Broadcom Corp., Irvine, CA, USA
fDate :
7/1/2012 12:00:00 AM
Abstract :
Online adaptive equalization is proposed to calibrate channel mismatch errors in time-interleaved (TI) analog-to-digital converter (ADC) arrays with a linear reference path. Code-domain filters are shown to be effective in removing interchannel as well as intrachannel nonlinearity and mismatch errors, including offset, gain, and differential nonlinearity (DNL) and integral nonlinearity (INL) mismatches. An 8-bit, 600-MS/s, 0.13- μm CMOS prototype measured a signal-to-noise plus distortion ratio (SNDR) of 31.0/47.4 dB, a spurious-free dynamic range (SFDR) of 32.8/63.6 dB, a DNL of 1.30/0.30 LSBs, and an INL of 1.70/0.23 LSBs in lab testing without/with equalization, respectively.
Keywords :
CMOS integrated circuits; adaptive equalisers; analogue-digital conversion; calibration; filters; CMOS prototype; INL mismatch; SNDR; TI-ADC arrays; channel mismatch error calibration; code-domain filters; differential nonlinearity; integral nonlinearity mismatch; intrachannel nonlinearity; linear reference path; online adaptive equalization; signal-to-noise plus distortion ratio; size 0.13 mum; spurious-free dynamic range; time-interleaved analog-to-digital conversion; word length 8 bit; Adaptive equalizers; Bandwidth; Calibration; Capacitors; Clocks; Linearity; Timing; Background digital calibration; SAR ADC; differential nonlinearity; gain error; integral nonlinearity; offset; online adaptive equalization; path mismatch; time-interleaved ADC array; timing skew;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2011.2177005
