A Digitally Calibrated CT Quadrature Bandpass Sigma Delta ADC for Wimax/LTE
2009 (English)In: 2009 International Symposium on Signals, Circuits and Systems, ISSCS 2009, IEEE , 2009, 105-108 p.Conference paper (Refereed)
This paper presents a digitally calibrated Continuous Time Quadrature Sigma Delta ADC for WiMAX/LTE narrow bands. The proposed architecture employs a 5(th) order 2-bit quadrature bandpass Sigma Delta modulator. Dithering and Adaptive Line Enhancement techniques are combined to compensate for mismatch errors in the I/Q paths. The proposed calibration technique introduces no complexity in the ADC design and can be used online. The simulation results show an improvement of 16.75dB in SINAD and 34.42dB in Image Rejection, when a +/- 30% variation in the loop active RC filter coefficients is introduced in the behavioral model.
Place, publisher, year, edition, pages
IEEE , 2009. 105-108 p.
Active RC filter, Adaptive line enhancement, Behavioral model, Calibration techniques, Continuous time, Image rejection, Mismatch errors, Narrow bands, Order 2, Proposed architectures, Quadrature bandpass, Simulation result
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-29925DOI: 10.1109/ISSCS.2009.5206193ISI: 000275854200026ScopusID: 2-s2.0-70449489099ISBN: 978-1-4244-3784-9OAI: oai:DiVA.org:kth-29925DiVA: diva2:398439
2009 International Symposium on Signals, Circuits and Systems, ISSCS 2009; Iasi; Romania; 9 July 2009 through 10 July 2009
QC 201102172011-02-172011-02-172014-10-10Bibliographically approved