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dc.contributor.advisorSanchez-Sinencio, Edgar
dc.creatorMohieldin, Ahmed Nader
dc.date.accessioned2004-09-30T01:47:19Z
dc.date.available2004-09-30T01:47:19Z
dc.date.created2003-08
dc.date.issued2004-09-30
dc.identifier.urihttp://hdl.handle.net/1969.1/233
dc.description.abstractVast attention has been paid to active continuous-time filters over the years. Thus as the cheap, readily available integrated circuit OpAmps replaced their discrete circuit versions, it became feasible to consider active-RC filter circuits using large numbers of OpAmps. Similarly the development of integrated operational transconductance amplifier (OTA) led to new filter configurations. This gave rise to OTA-C filters, using only active devices and capacitors, making it more suitable for integration. The demands on filter circuits have become ever more stringent as the world of electronics and communications has advanced. In addition, the continuing increase in the operating frequencies of modern circuits and systems increases the need for active filters that can perform at these higher frequencies; an area where the LC active filter emerges. What mainly limits the performance of an analog circuit are the non-idealities of the used building blocks and the circuit architecture. This research concentrates on the design issues of high frequency continuous-time integrated filters. Several novel circuit building blocks are introduced. A novel pseudo-differential fully balanced fully symmetric CMOS OTA architecture with inherent common-mode detection is proposed. Through judicious arrangement, the common-mode feedback circuit can be economically implemented. On the level of system architectures, a novel filter low-voltage 4th order RF bandpass filter structure based on emulation of two magnetically coupled resonators is presented. A unique feature of the proposed architecture is using electric coupling to emulate the effect of the coupled-inductors, thus providing bandwidth tuning with small passband ripple. As part of a direct conversion dual-mode 802.11b/Bluetooth receiver, a BiCMOS 5th order low-pass channel selection filter is designed. The filter operated from a single 2.5V supply and achieves a 76dB of out-of-band SFDR. A digital automatic tuning system is also implemented to account for process and temperature variations. As part of a Bluetooth transmitter, a low-power quadrature direct digital frequency synthesizer (DDFS) is presented. Piecewise linear approximation is used to avoid using a ROM look-up table to store the sine values in a conventional DDFS. Significant saving in power consumption, due to the elimination of the ROM, renders the design more suitable for portable wireless communication applications.en
dc.format.extent2702096 bytesen
dc.format.extent295254 bytesen
dc.format.mediumelectronicen
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherTexas A&M University
dc.subjectContinuous-time filteren
dc.subjectOTA-C filteren
dc.subjectCommon-mode feedbacken
dc.subjectCommon-mode feedforwarden
dc.subjectFully differentialen
dc.subjectPseudo differentialen
dc.subjectWireless communicationen
dc.subjectLC bandpass filteren
dc.subjectDirect digital frequency synthesizeren
dc.subjectfrequency tuningen
dc.subjectLow voltageen
dc.subjectLow poweren
dc.titleHigh performance continuous-time filters for information transfer systemsen
dc.typeBooken
dc.typeThesisen
thesis.degree.departmentElectrical Engineeringen
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorTexas A&M Universityen
thesis.degree.nameDoctor of Philosophyen
thesis.degree.levelDoctoralen
dc.contributor.committeeMemberKarsilayan, Aydin
dc.contributor.committeeMemberParlos, Alexander
dc.contributor.committeeMemberSilva-Martinez, Jose
dc.contributor.committeeMemberChang, Kai
dc.type.genreElectronic Dissertationen
dc.type.materialtexten
dc.format.digitalOriginborn digitalen


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