A low power digitizer for precision carrier band measurements
Name
46888172-MIT.pdf
Description
Full printable version
Size
3.76 MB
Format
Adobe PDF
Checksum (MD5)
5407bc525ff24a918aa2f39ee7e9a04e
Author(s)
Santarelli, Keith R. (Keith Robert), 1977-
Advisor(s)
James K. Roberge and Edmund J. Balboni.
Date Issued
2000
Publisher
Massachusetts Institute of Technology
Abstract
It has been found that the amplitude of the 20kHz harmonic at the output of a particular third order [Sigma][Delta] analog to digital converter drifts significantly as the temperature fluctuates. In this document, both methods of ascertaining the source of this drift and ways to reduce it are discussed. First, the settling time of the circuit is explored by analyzing the design of the transmission gates used to implement the switched capacitor integrators in the [Sigma][Delta]. Next, the effects of op amp transistor mismatch is considered via simulations which introduce small random offsets to the widths and lengths in the transistors of each op amp. Finally, a calibration scheme which can be used to eliminate the AC gain variation of the [Sigma][Delta] at 20kHz is analyzed, and simulation results of the circuit used to perform the calibration are portrayed.
Description
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
Includes bibliographical references (leaves 77-78).
Subjects
Electrical Engineering and Computer Science.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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copyright. They may be viewed from this source for any purpose, but
reproduction or distribution in any format is prohibited without written
permission. See provided URL for inquiries about permission.
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