2026-09-18T20:49:19Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/613022022-01-13T07:54:29Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
John K. Fiorenza and Joel L. Dawson.
Li, Wendi, M. Eng. Massachusetts Institute of Technology
Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2011-02-23T15:01:33Z
2011-02-23T15:01:33Z
2009
2009
http://hdl.handle.net/1721.1/61302
702658424
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 132-133).
Operational amplifiers continue to develop to meet modern demands on performance. This document describes an operational amplifier designed for a highly specific telecommunications application - to serve as the buffer between an I/Q demodulator and Gm-C filter. Requirements set forth by this application call for a wide common mode input range, stretching from ground to the positive supply, and a programmable output offset, offering up to ±25mV differentially from the output common mode. This programmable offset is implemented using two complementary current mode digital-to-analog converters (DACs) directly driving the input pins of the operational amplifier. The output offset is serially programmed with a three pin SPI interface. In addition to programming the offset DACs, the SPI interface is also designed to be able to program four additional parameters necessary for the function of the programmable Gm-C filter, into which the opamp will be integrated.
by Wendi Li.
M.Eng.
133 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
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.
http://dspace.mit.edu/handle/1721.1/7582
Electrical Engineering and Computer Science.
Wide common mode input operational amplifier with serially programmable output offset
Thesis
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Publication
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<Abstract>Operational amplifiers continue to develop to meet modern demands on performance. This document describes an operational amplifier designed for a highly specific telecommunications application - to serve as the buffer between an I/Q demodulator and Gm-C filter. Requirements set forth by this application call for a wide common mode input range, stretching from ground to the positive supply, and a programmable output offset, offering up to ±25mV differentially from the output common mode. This programmable offset is implemented using two complementary current mode digital-to-analog converters (DACs) directly driving the input pins of the operational amplifier. The output offset is serially programmed with a three pin SPI interface. In addition to programming the offset DACs, the SPI interface is also designed to be able to program four additional parameters necessary for the function of the programmable Gm-C filter, into which the opamp will be integrated.</Abstract>
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