Sliding-Mode Amplitude Control Techniques for Harmonic Oscillators

• Published in: IEEE transactions on circuits and systems. II, Express briefs Vol. 54; no. 11; pp. 1014 - 1018
• Main Authors: Marquart, C.A., Zourntos, T., Magierowski, S., Mathai, N.J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2007; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amplitude control; Amplitudes; analog circuits; Circuits; Control systems; Degradation; Frequency measurement; harmonic distortion; Harmonic oscillators; Noise measurement; nonlinear systems; Norms; Oscillators; Phase measurement; Phase noise; Sliding mode control; Strategy; Testing; Tuning; voltage-controlled oscillator (VCO); wide tuning range; nonlinear systems; sliding-mode control; harmonic distortion; wide tuning range; analog circuits; Amplitude control; voltage-controlled oscillator (VCO)
• ISSN: 1549-7747; 1558-3791
• DOI: 10.1109/TCSII.2007.903793

This paper investigates both theoretical and implementation-level aspects of switching-feedback control strategies for the development of harmonic oscillators. We use sliding-mode compensation based on various norms of the system state to achieve amplitude control over a wide-tuning range. A 7.6-MHz I/Q LC oscillator is developed and tested. Measurements show that implementation of the proposed switch-based amplitude controller provides accurate amplitude control over the entire frequency tuning range while inducing only a minor phase noise degradation (of less than 2 dBc/Hz).