H -A S -C T IGH CCURACY WITCHED APACITOR ECHNIQUES A T F A ADC D PPLIED O ILTER ND ESIGN High-Accuracy Switched-Capacitor Techniques for Filter and ADC Design P J Q ATRICK OHN UINN Cover design: different capacitor implementations are shown for various SC circuits; background is a SEM image of the cross-section of a high-density metal filament capacitor in 65nm CMOS. © Patrick John Quinn: 2006 All rights reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner. Printing: Printservice TU/e H -A S -C T IGH CCURACY WITCHED APACITOR ECHNIQUES A T F A ADC D PPLIED O ILTER ND ESIGN High-Accuracy Switched-Capacitor Techniques for Filter and ADC Design PROEFSCHRIFT ter verkrijging van de graad van doctor aan de Technische Universiteit Eindhoven, op gezag van de Rector Magnificus, prof.dr.ir. C.J. van Duijn, voor een commissie aangewezen door het College voor Promoties in het openbaar te verdedigen op woensdag 13 september 2006 om 16.00 uur door Patrick John Quinn geboren te Dublin, Ierland Dit proefschrift is goedgekeurd door de promotor: prof.dr.ir. A.H.M. van Roermund Samenstelling promotiecommissie: prof.dr.ir. J.H. Blom (Voorzitter) prof.dr.ir. A.H.M. van Roermund (Promotor) prof. ir. A.J.M. van Tuijl (UT) prof.dr.ir. G.C.M. Meijer (TUD) prof.dr.ir. P.G.M. Baltus prof.dr.ir. J.W.M. Bergmans prof.dr.ir. R.H.J.M. Otten dr.ir. J.A. Hegt CIP-DATA LIBRARY TECHNISCHE UNIVERSITEIT EINDHOVEN Quinn, Patrick J. High-accuracy switched-capacitor techniques applied to filter and ADC design / by Patrick John Quinn. – Eindhoven : Technische Universiteit Eindhoven, 2006. Proefschrift. – ISBN-10: 90-386-1813-1 ISBN-13: 978-90-386-1813-5 NUR 959 Trefw.: geschakelde capaciteiten / elektronische filters / analoog-digitale conversie / CMOS- schakelingen. Subject headings: switched capacitor filters / analogue-digital conversion / CMOS integrated circuits /mixed analogue-digital integrated circuits. To Orla, Siobhán, and my parents A BSTRACT Abstract In this thesis, innovative techniques are proposed as alternatives to traditional switched- capacitor (SC) charge-transfer techniques for the more accurate creation of key functions such as required for analogue signal conditioning and data conversion. Active charge transport with the help of an amplifier is replaced by passive (delta) charge redistribution with reduced dependency on capacitor mismatch and with the amplifier used predominantly for buffering. Orthogonal hardware modulation is used in conjunction with N-path filtering, thus achieving very high accuracy, while preventing the problem of pattern noise. A floating-hold buffer is proposed which enables accurate addition of signal voltages without requiring precisely matching and linear components. The new methods have been applied to the design of CMOS SC bandpass filters and algorithmic ADC stages (both cyclic and pipelined). The intrinsic accuracies achieved go beyond those achieved with previous state-of-the-art solutions with a consequent reduction in power for the same speed applications. x Abstract