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You searched for subject:(Memoryless Nonlinearities). Showing records 1 – 2 of 2 total matches.

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University of Houston

1. Zamanian, Fatemeh. Nonlinear Controller Design for Regulating Systems.

Degree: PhD, Mechanical Engineering, University of Houston

Presented in this dissertation is a nonlinear controller synthesis methodology based on the inverse Sinusoidal Input Describing Function (SIDF) for a class of regulating systems. The design goal is to improve regulating performance beyond what is achievable by a linear control for a predicted level of disturbance step size. The controller design is executed using open loop frequency domain information and is applicable when the frequency response of a linear design cannot satisfy the designed open loop gain and phase characteristics. The gain and phase differences between the designed open loop frequency response and that of a linear design is treated as SIDF distortions. The inverse describing function approach is employed to identify an isolated explicit nonlinearity that is associated with obtained gain and phase distortions. For this, a computational solution to the inverse SIDF for a broad class of hysteresis or memoryless explicit nonlinearities is developed. The proposed numerical solution uses gain and phase distortions as a function of input amplitude size to identify the nonlinearity, and does not require a priori knowledge of the nonlinearity in the estimation process. The output from the algorithm is a non-parametric model of the nonlinearity from which a parametric model can be recovered. To illustrate the proposed nonlinear controller design technique, the idle speed control of a V-6 fuel injected engine model subject to an external torque load disturbance is considered. The closed loop performance is validated through simulation and the closed loop stability in the sense of the bounded-input-bounded-output (BIBO) is assessed using Circle Theorem. Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Rao, Jagannatha R. (committee member), Song, Gangbing (committee member), Provence, Robert S. (committee member).

Subjects/Keywords: Nonlinear Control; Frequency Domain; Inverse Sinusoidal Input Describing Function; H_∞ Linear Control Synthesis; BIBO Stability; Inverse Sinusoidal Input Describing Function; Gain distortions; Phase distortions; Memoryless Nonlinearities

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zamanian, F. (n.d.). Nonlinear Controller Design for Regulating Systems. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/2830

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16th Edition):

Zamanian, Fatemeh. “Nonlinear Controller Design for Regulating Systems.” Doctoral Dissertation, University of Houston. Accessed January 23, 2021. http://hdl.handle.net/10657/2830.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7th Edition):

Zamanian, Fatemeh. “Nonlinear Controller Design for Regulating Systems.” Web. 23 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Zamanian F. Nonlinear Controller Design for Regulating Systems. [Internet] [Doctoral dissertation]. University of Houston; [cited 2021 Jan 23]. Available from: http://hdl.handle.net/10657/2830.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Zamanian F. Nonlinear Controller Design for Regulating Systems. [Doctoral Dissertation]. University of Houston; Available from: http://hdl.handle.net/10657/2830

Note: this citation may be lacking information needed for this citation format:
No year of publication.


University of Illinois – Urbana-Champaign

2. Kwon, Dae Hyun. Digitally enhanced CMOS RF transmitter with integrated power amplifier.

Degree: PhD, 1200, 2010, University of Illinois – Urbana-Champaign

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. Advisors/Committee Members: Chiu, Yun (advisor), Chiu, Yun (Committee Chair), Feng, Milton (committee member), Rosenbaum, Elyse (committee member), Schutt-Ainé, José E. (committee member).

Subjects/Keywords: 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)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kwon, D. H. (2010). Digitally enhanced CMOS RF transmitter with integrated power amplifier. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/15601

Chicago Manual of Style (16th Edition):

Kwon, Dae Hyun. “Digitally enhanced CMOS RF transmitter with integrated power amplifier.” 2010. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 23, 2021. http://hdl.handle.net/2142/15601.

MLA Handbook (7th Edition):

Kwon, Dae Hyun. “Digitally enhanced CMOS RF transmitter with integrated power amplifier.” 2010. Web. 23 Jan 2021.

Vancouver:

Kwon DH. Digitally enhanced CMOS RF transmitter with integrated power amplifier. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2010. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2142/15601.

Council of Science Editors:

Kwon DH. Digitally enhanced CMOS RF transmitter with integrated power amplifier. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/15601

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