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Charge pumping techniques in ultra-low current transconductor design
|dc.description||Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to firstname.lastname@example.org, referencing the URI of the item.||en_US|
|dc.description||Includes bibliographical references (leaves 100-102).||en_US|
|dc.description||Issued also on microfiche from Lange Micrographics.||en_US|
|dc.description.abstract||The purpose of this thesis is to introduce the use of interface-trap charge pumping devices (ITCP) in an analog application based in ultra-low-current transconductors. This application naturally exploits the continuous nature of the current generated by the interface-trap charge pump. An interface-trap charge-pump has been used as an ultra low current source for biasing an operational transconductance amplifier in both single-ended and fully differential configurations. Source degeneration techniques have been applied to reduce the total harmonic distortion. The history, physics and a primary model of ITCP are presented as background material. The analysis has been extended for the design of analog circuits based in ultra-low frequency OTA filters. A novel technique based on ITCP for a floating current source is presented as an alternative solution for fully differential structures. The performance of the proposed techniques and circuit implementations has been characterized. The proposed filters have been fabricated in two different technologies 1.2m and 0.5m n-well CMOS process. The fabricated filters have programmable frequencies of operation in the range of 0.1 to 100 Hz. Experimental results of the test chips were very satisfactory and are in agreement with the theoretical basis.||en_US|
|dc.publisher||Texas A&M University||en_US|
|dc.rights||This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.||en_US|
|dc.subject||Major electrical engineering.||en_US|
|dc.title||Charge pumping techniques in ultra-low current transconductor design||en_US|
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