Proceedings ArticleDOI
Improved harmonic analysis of RC-active phase shift oscillators
John Taylor,Christopher Clarke +1 more
- pp 1272-1275
TLDR
The proposed method introduces the truncated harmonic transfer function (THTF) which is related to the two-sinusoidal-input describing function (TSIDF) of non-linear control theory and allows accurate calculation of the distortion terms in oscillator systems containing higher signal levels and therefore higher levels of nonlinearity than is possible with conventional methods.Abstract:
This paper describes an improved method for calculating the harmonic distortion content of active-RC phase shift oscillators. The proposed method introduces the truncated harmonic transfer function (THTF) which is related to the two-sinusoidal-input describing function (TSIDF) of non-linear control theory. This allows accurate calculation of the distortion terms in oscillator systems containing higher signal levels and therefore higher levels of nonlinearity than is possible with conventional methods. Although the method is quite general in its application, in this paper it is demonstrated using examples employing the Wien RC-bandpass oscillator with a quadratic nonlinearity.read more
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Dissertation
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Book ChapterDOI
Van der Pol Oscillator
TL;DR: In this paper, the van der Pol oscillator model is used for the analysis of the harmonics amplitudes of the oscillator and the total harmonic distortion (THD) is calculated analytically.
References
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Book
Multiple-Input Describing Functions and Nonlinear System Design
TL;DR: The theory of automatic control has been advanced in important ways during recent years, particularly with respect to stability and optimal control, but these theories do not, however, lay to rest all questions of importance to the control engineer.
Journal ArticleDOI
On the design of voltage-controlled sinusoidal oscillators using OTAs
TL;DR: In this paper, a unified systematic approach to the design of voltage-controlled oscillators using only operational transconductance amplifiers (OTAs) and capacitors is discussed, and two classical oscillator models, i.e., quadrature and bandpass-based, are employed to generate several oscillator structures.
Journal ArticleDOI
Operational amplifier circuits for the Wien-bridge oscillator
TL;DR: In this paper, the magnitude and phase response of the Wien-bridge oscillator were adjusted to keep the poles on the imaginary axis at much higher frequencies than is normally expected, thus extending the range of operation of the oscillator.