AUTHORS: Kittipong Tripetch
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ABSTRACT: An analysis of a BJT phase shift amplifier is proposed in a detail polynomial form. The numerator and denominator polynomial form are derived which can be seen as a symbolic coefficient which are multiplied with complex frequencies of the order of the polynomial. A detail analysis is very laborious but it is presented some of the coefficients which are a function of the small signal parameters of the equivalent circuit such as a transconductance, output resistor, base spreading resistor, pi resistor, myu resistor and two parasitic capacitances, passive resistor for biasing, passive capacitors and resistors which are the core circuit of the phase shift networks. After dc operating point are designed as a function of the current consumption. All small signal parameters of the transistors of the phase shift amplifier are designed as a function of the current consumption. The BJT phase shift frequency response can be plotted by a polynomial form which can be calculated by MATLAB. The BJT phase shift amplifier may not worked as a phase shift oscillator without the input impedance formulas.
KEYWORDS: BJT amplifiers, BJT oscillators, transfer function of the input impedance, impedance matching function, MATLAB graphs,
REFERENCES:
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1] E. L. Ginzton, L. M Hollingsworth, “Phase Shift Oscillators”, Proceedings of the I.R.E, February 1941, pp. 43-49
[2] R. W. Johnson, “ Extending the frequency range of the Phase Shift Oscillator”, Proceedings of the I.R.E, September 1945, pp. 597-603.
[3] S. Sherr, “ Generalized Equations for RC Phase Shift Oscillator”, Proceedings of the I.R.E, July 1954, pp. 1169-1172
[4] W. M. Locke, V. M. Moore, W. W. Happ, “ A New Analysis of the transistor Phase Shift Oscillator”, Journal Brit. I. R. E, February 1963, pp. 145-153
[5] K. Tripetch, N. Nakano, “ A Design of Cross Couple Oscillator with root locus by using current consumption”, Journal of Electrical Engineering and Electronic Technology, Volume 7, Issue2, 1000158, pp. 1-6 , June2018
[6] K. Tripetch, “The input impedance polynomial form of the Phase shift amplifier circuit diagram”, unpublished report, July 2019, pp. 1- 67
