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Digitally enhanced CMOS RF transmitter with integrated power amplifier
Kwon, Dae Hyun
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https://hdl.handle.net/2142/15601
Description
- Title
- Digitally enhanced CMOS RF transmitter with integrated power amplifier
- Author(s)
- Kwon, Dae Hyun
- Issue Date
- 2010-05-14T20:52:05Z
- Director of Research (if dissertation) or Advisor (if thesis)
- Chiu, Yun
- Doctoral Committee Chair(s)
- Chiu, Yun
- Committee Member(s)
- Feng, Milton
- Rosenbaum, Elyse
- Schutt-Ainé, José E.
- Department of Study
- Electrical & Computer Eng
- Discipline
- Electrical & Computer Engr
- Degree Granting Institution
- University of Illinois at Urbana-Champaign
- Degree Name
- Ph.D.
- Degree Level
- Dissertation
- Keyword(s)
- Adaptive equalizer
- AM-AM
- AM-PM
- Class-B power amplifier
- Complementary metal-oxide semiconductor radio frequency (CMOS RF) transmitter
- digital equalization
- drain efficiency
- error-vector magnitude
- look-up table
- memoryless nonlinearities
- orthogonal frequency-division multiplexing (OFDM)
- peak-to-average power ratio
- power-added efficiency
- power amplifier
- predistortion
- Complementary metal–oxide–semiconductor (CMOS)
- Radio frequency (RF)
- Abstract
- An energy-efficient, 3.5 GHz, direct-conversion RF transmitter with integrated 23 dBm, Class-B power amplifier (PA) is fabricated in a 0.13 μm CMOS process. The TX chip is packaged using a low-cost chip-on-board (COB) technique. When 20-MHz bandwidth OFDM signals are transmitted, a high TX average power efficiency is achieved exploiting the dynamic current biasing of the Class-B PA and a low-loss output matching network using high-Q bondwire inductances in the package. Assisted by an integrated feedback path, a two-dimensional, digital look-up table (2-D LUT) adapted by complex gradient-descent algorithms compensates the I/Q mismatch and memoryless nonlinearities of the whole transmit path, including the severe amplitude and phase distortions of the on-chip PA. Fifth-order Butterworth transmit filters with 34 MHz cutoff frequency sufficiently attenuate the aliases of the 80 MS/s digital-to-analog converters (DACs), while retaining high in-band fidelity without corrupting the predistorted signal. When a 20 MHz, 64-QAM OFDM signal with 9.6 dB peak-to-average power ratio (PAPR) was transmitted, the measured average drain efficiency (DE) of the PA was 12.5% at 9.6 dB back-off and 17.5% at 7 dB back-off, and the corresponding error-vector magnitude (EVM) was measured −29.6 dB and −26.3 dB with equalization, respectively. Peak DE of 55% and 25 dBm saturated output power were also measured for the same PA in a stand-alone package.
- Graduation Semester
- 2010-5
- Permalink
- http://hdl.handle.net/2142/15601
- Copyright and License Information
- Copyright 2010 Dae Hyun Kwon
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Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at IllinoisDissertations and Theses - Electrical and Computer Engineering
Dissertations and Theses in Electrical and Computer EngineeringManage Files
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