2026-09-20T02:58:48Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/15601 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Chiu, Yun Chiu, Yun Feng, Milton Rosenbaum, Elyse Schutt-Ainé, José E. Kwon, Dae Hyun 2010-05-14T20:52:05Z 2010-05-14T20:52:05Z 2012-05-15T10:00:51Z 2010-05-14T20:52:05Z 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. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-04-22T13:20:04Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Kwon_Dae Hyun.doc: 9221632 bytes, checksum: 4e1f89301200f0f77b56aef3cf6d28a4 (MD5) Kwon_Dae Hyun.pdf: 3363279 bytes, checksum: 8ef5eeb2a7e3beb8ad10167c5535efac (MD5) Made available in DSpace on 2010-05-14T20:52:05Z (GMT). No. of bitstreams: 4 Kwon_Dae Hyun.pdf: 3363279 bytes, checksum: 8ef5eeb2a7e3beb8ad10167c5535efac (MD5) Kwon_Dae Hyun.doc: 9221632 bytes, checksum: 4e1f89301200f0f77b56aef3cf6d28a4 (MD5) Kwon_DaeHyun.pdf: 3363279 bytes, checksum: 8ef5eeb2a7e3beb8ad10167c5535efac (MD5) license.txt: 4056 bytes, checksum: 07caa99269aa99d81d35a0b7b062825a (MD5) Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2010-05-14T20:52:51Z Item is restricted until 2012-05-14T20:52:43Z Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2012-05-15T10:00:51Z Item was in collections: University of Illinois Dissertations and Theses (ID: 204) Dissertations and Theses - Electrical and Computer Engineering (ID: 446) No. of bitstreams: 5 Kwon_DaeHyun.pdf.txt: 196026 bytes, checksum: 76cda2f0003f6e02fa21cb5f5e047c9a (MD5) Kwon_Dae Hyun.pdf: 3363279 bytes, checksum: 8ef5eeb2a7e3beb8ad10167c5535efac (MD5) Kwon_Dae Hyun.doc: 9221632 bytes, checksum: 4e1f89301200f0f77b56aef3cf6d28a4 (MD5) Kwon_DaeHyun.pdf: 3363279 bytes, checksum: 8ef5eeb2a7e3beb8ad10167c5535efac (MD5) license.txt: 4056 bytes, checksum: 07caa99269aa99d81d35a0b7b062825a (MD5) Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2012-05-15T10:00:51Z http://hdl.handle.net/2142/15601 en Copyright 2010 Dae Hyun Kwon 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) Digitally enhanced CMOS RF transmitter with integrated power amplifier 2010-5 Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Electr & Computer Eng-UIUC 10KS1200PHD