Paper Info
Title
Linearity Enhancement of VCO-Based Quantizers for SD Modulators by Means of a Tracking Loop
Abstract
A new approach for mitigating the nonlinearity in the voltage-frequency characteristic of voltage-controlled oscillator (VCO)-based quantizers is proposed in this brief. The signal to be converted is coarsely estimated from the VCO-based quantizer output by digital integration and then subtracted to the input. The VCO only converts a residue of very low level and only with a small-signal component, operating in a narrow region of its voltage-frequency characteristic. The tracking loop so created drastically reduces the harmonic distortion. As compared to other approaches used for the same purpose, the proposed one is simpler and less prone to circuit errors. Simulation results show the feasibility of this approach and validate the theoretical analysis presented in this brief.
Year
DOI
Venue
2014
10.1109/TCSII.2014.2319914
Circuits and Systems II: Express Briefs, IEEE Transactions
Keywords
Field
DocType
frequency convertors,harmonic distortion,quantisation (signal),sigma-delta modulation,voltage-controlled oscillators,SD modulators,VCO-based quantizers,circuit errors,digital integration,harmonic distortion,linearity enhancement,small-signal component,tracking loop,voltage-controlled oscillator,voltage-frequency characteristic,Analog-to-digital converters (ADCs),frequency-to-digital converters,sigma??delta modulation (SDM),voltage-controlled oscillator (VCO)-based quantizer
Oscillation,Total harmonic distortion,Nonlinear system,Control theory,Linearity,Electronic engineering,Modulation,Voltage-controlled oscillator,Transfer function,Quantization (signal processing),Mathematics
Journal
Volume
Issue
ISSN
61
6
1549-7747
Citations 
PageRank 
References 
0
0.34
9
Authors
2
Name
Order
Citations
PageRank
Francisco Colodro141.29
A. Torralba225251.83