LMS-Based Digital Background Linearization Technique for VCO-Based Delta-Sigma ADC
Journal
IEEE MWSCAS
Pages
202-205
Date Issued
2014
Author(s)
Abstract
This paper presents a digital background linearization technique for VCO-based delta-sigma ADC. The nonlinearity of the VCO in the main ADC is mitigated with the aid of the reference OP-based delta-sigma ADC and the digital least-mean square (LMS) correction algorithm. The reference ADC provides sufficient linearity performance as the calibration reference to form an inverse transfer function of the nonlinear voltage-to-frequency characteristic while the LMS-based calibration scheme shortens the correction time to reduce energy consumption. The simulated SFDR/SNDR of 70.2 dB/62.7 dB over a bandwidth of 10 MHz is achieved, which is 23.3 dB/16.6 dB better than the SFDR/SNDR of uncalibrated ADC. A prototype first-order VCO-based ADC is designed in 90-nm CMOS process and dissipates 2.89 mW from a supply voltage of 1.2 V. © 2014 IEEE.
Subjects
digital background calibration; LMS algorithm; VCO nonlinearity; VCO-based ADC
SDGs
Other Subjects
Calibration; Energy utilization; Linearization; Variable frequency oscillators; Calibration reference; Digital background calibration; Frequency characteristic; Least mean square (LMS); Linearization technique; LMS algorithms; Reduce energy consumption; Vco based; Analog to digital conversion
Type
conference paper