Radio frequency digital to analog converter
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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| Format: | Thesis |
| Language: | en_US |
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Massachusetts Institute of Technology
2005
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| Online Access: | http://hdl.handle.net/1721.1/28277 |
| _version_ | 1826211422471716864 |
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| author | Luschas, Susan, 1975- |
| author2 | Hae-Seung Lee. |
| author_facet | Hae-Seung Lee. Luschas, Susan, 1975- |
| author_sort | Luschas, Susan, 1975- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003. |
| first_indexed | 2024-09-23T15:05:39Z |
| format | Thesis |
| id | mit-1721.1/28277 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:05:39Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/282772019-04-12T09:11:03Z Radio frequency digital to analog converter RF DAC Luschas, Susan, 1975- Hae-Seung Lee. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Electrical Engineering and Computer Science. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003. Includes bibliographical references (p. 124-126). Dynamic performance of high speed, high resolution digital-to-analog converters (DACs) is limited by distortion at the data switching instants. Inter-symbol interference (ISI), imperfect timing synchronization and clock jitter are all culprits. A DAC output current controlled by an oscillating waveform is proposed to mitigate the effects of the switching distortion. The oscillating waveform should be a multiple (k*fs) of the sampling frequency (f), where k>l. The waveforms can be aligned so that the data switching occurs in the zero regions of the oscillating output. This makes the DAC insensitive to switch dynamics and jitter. The architecture has the additional benefit of mixing the DAC impulse response energy to a higher frequency. An image of a low IF input signal can therefore be output directly at a high IF or RF frequency for transmit communications applications. A narrow-band sigma-delta DAC with eight unit elements is chosen to demonstrate the radio frequency digital-to-analog converter (RF DAC) concept. A sigma-delta architecture allows the current source transistors to be smaller since mismatch shaping is employed. Smaller current source transistors have a lower drain capacitance, allowing large high frequency output impedance to be achieved without an extra cascode transistor. Elimination of the cascode reduces transistor headroom requirements and allows the DAC to be built with a 1.8V supply. The RF DAC prototype is targeted to GSM transmit specifications and implemented in 0.1 8ptm CMOS technology. Measured single-tone SFDR is -75dBc, SNR is 52dB, and IMD3 is -70.8dBc over a 17.5MHz bandwidth centered at 942.5MHz. Measured SNR has the predicted dependence on the phase alignment of the data clock and oscillating pulse. by Susan Luschas. Ph.D. 2005-09-26T19:31:07Z 2005-09-26T19:31:07Z 2003 2003 Thesis http://hdl.handle.net/1721.1/28277 53278026 en_US 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 126 p. 8152848 bytes 8168717 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Electrical Engineering and Computer Science. Luschas, Susan, 1975- Radio frequency digital to analog converter |
| title | Radio frequency digital to analog converter |
| title_full | Radio frequency digital to analog converter |
| title_fullStr | Radio frequency digital to analog converter |
| title_full_unstemmed | Radio frequency digital to analog converter |
| title_short | Radio frequency digital to analog converter |
| title_sort | radio frequency digital to analog converter |
| topic | Electrical Engineering and Computer Science. |
| url | http://hdl.handle.net/1721.1/28277 |
| work_keys_str_mv | AT luschassusan1975 radiofrequencydigitaltoanalogconverter AT luschassusan1975 rfdac |