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Frequency-Variation Based Method for Parameter Estimation of Transistor Amplifier

Authors: Akash Rathee, Harish Parthasarathy


In this paper, a frequency-variation based method has been proposed for transistor parameter estimation in a commonemitter transistor amplifier circuit. We design an algorithm to estimate the transistor parameters, based on noisy measurements of the output voltage when the input voltage is a sine wave of variable frequency and constant amplitude. The common emitter amplifier circuit has been modelled using the transistor Ebers-Moll equations and the perturbation technique has been used for separating the linear and nonlinear parts of the Ebers-Moll equations. This model of the amplifier has been used to determine the amplitude of the output sinusoid as a function of the frequency and the parameter vector. Then, applying the proposed method to the frequency components, the transistor parameters have been estimated. As compared to the conventional time-domain least squares method, the proposed method requires much less data storage and it results in more accurate parameter estimation, as it exploits the information in the time and frequency domain, simultaneously. The proposed method can be utilized for parameter estimation of an analog device in its operating range of frequencies, as it uses data collected from different frequencies output signals for parameter estimation.

Keywords: Perturbation Technique, Parameter estimation, frequency-variation based method.

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[1] Gao J., Dong X.,Wang W.-B., Li Y., Pan C., Instantaneous parameter extraction via wavelet trasform. IEEE Trans. Geosci. Remote Sens. 37(2), 867-870(1999)
[2] Liden P.A., Fusco V.F., Concurrent global optimisation for microvave device parameter estimation. IEEE Pro. H 140(2), 71-78(1993)
[3] Majumdar S., Parthasarathy H., Wavelet-Based Transistor Parameter estimation. Circuits syst Signal Process.doi:10.1007/s00034-010-9181-9
[4] Schreurs D.M.M.-P., Verpecht J., Vandenberghe S., Vandamme E., Straightforward and accurate nonlinear device model parameter estimation method based on vectorial large signal measurements. IEEE Trans. Microwave Theory Tech. 50(10), 2315-2319 (2002)
[5] Toner B., Fusco V.F., Waveform based MOSFET dynamic large-signal parameter estimation. IEE Pro., Microwave Antennas Propag. 150(6), 451- 458 (2003)
[6] Tseng H.C., Chou J.H.,, An efficient analytical approach for extracting the emitter inductance of collector-up HBTs. IEEE trans. Electron devices 51(7), 1200-1202 (2004)
[7] Vats V.B., Parthasarathy H.: Parameter estimation for time varying nonlinear circuit from state analysis and simulation. Commun. in Nonlinear Sc. and Num. simu. 13(4), 839-846(2008)
[8] Wang H., Yang H.Z., Hu G.Z., Combinatorial algorithms for BJT model parameter extraction, ICSE-96 proc., Penag, Malaysia, 1996.