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Global stability analysis and stabilization of power amplifier

Published on Nov 1, 2008
· DOI :10.1109/INMMIC.2008.4745722
Almudena Suárez Rodríguez (UC: University of Cantabria), Sanggeun Jeon14
Estimated H-index: 14
(California Institute of Technology),
David B. Rutledge33
Estimated H-index: 33
(California Institute of Technology)
Abstract
Power amplifiers often exhibit undesired behavior from certain input power value which cannot be predicted with a small-signal stability analysis. Among the commonly observed undesired phenomena are spurious oscillations, frequency divisions, hysteresis or chaos. In this contribution, simulation tools are presented, enabling an in-depth study of the origin and characteristics of these phenomena. The developed global stability analysis and stabilization tools have allowed an efficient suppression of the undesired behavior in a switching-mode power amplifier, with minimum degradation of the amplifier performance, in terms of drain efficiency and output power.
  • References (9)
  • Citations (3)
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References9
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#1Sanggeun Jeon (California Institute of Technology)H-Index: 14
#2Almudena Suárez Rodríguez (California Institute of Technology)
Last. David B. Rutledge (California Institute of Technology)H-Index: 33
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Power amplifiers (PAs) often exhibit instabilities giving rise to frequency divisions or spurious oscillations. The prediction of these instabilities requires a large-signal stability analysis of the circuit. In this paper, oscillations, hysteresis, and chaotic solutions, experimentally encountered in a high-efficiency class-E/F/sub odd/ PA with four transistors combined using a distributed active transformer, are studied through the use of stability and bifurcation analysis tools. The tools hav...
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#1Scott D. Kee (California Institute of Technology)H-Index: 7
#2Ichiro AokiH-Index: 9
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A new family of switching amplifiers, each member having some of the features of both class E and inverse F, is introduced. These class-E/F amplifiers have class-E features such as incorporation of the transistor parasitic capacitance into the circuit, exact truly switching time-domain solutions, and allowance for zero-voltage-switching operation. Additionally, some number of harmonics may be tuned in the fashion of inverse class F in order to achieve more desirable voltage and current waveforms...
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#2A. AnakabeH-Index: 11
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Different approaches for stability analysis of large-signal steady states in the harmonic domain have been developed in recent years. Particular efforts have been focused on microwave and RF circuit designs, where harmonic balance techniques are used extensively. In this work, frequency-domain control-design techniques are proposed in order to improve the stability margins of large-signal steady states. The methodology is based on circuit linearisation around the steady state under study and the...
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A stability analysis technique of microwave amplifiers, valid for large- or small-signal regimes, is presented. The technique calculates the system poles and zeroes from a closed-loop frequency response of the circuit linearised around its steady state. The method has been applied to an S-band monolithic amplifier, detecting spurious oscillations for certain specific bias conditions and input power levels, in good agreement with measurements.
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Jan 1, 1996 in IMS (International Microwave Symposium)
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This paper describes a method for the stability analysis and stabilization criteria in multi-device paralleled power amplifiers (PA) under large-signal operating conditions. The symmetry of the amplifier is exploited for a simple and effective study of odd- and even-order modes. The overall stability analysis is transformed into a sequence of analyses on single-mode single-transistor large-signal equivalent amplifiers, which are carried out by using a conversion matrix approach. Examples of appl...
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Stability analysis is an important issue which should be solved at the beginning of the power amplifier design. An RC feed-back network is often adopted to improve the stability of power amplifier. Through the analysis of the RC network, a novel method to estimate the RC value is presented in this paper, which facilitates circuits design. A single stage power amplifier is designed in CMOS process to verify the feasibility of this method.
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