Continuously Tunable Frequency and Phase Biquad Oscillator

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dc.contributor.authorChivapreecha, Sorawat
dc.contributor.authorSuwannawach, Piyapan
dc.date.accessioned2026-08-06T10:55:23Z
dc.date.available2026-08-06T10:55:23Z
dc.date.issued2026-05-01
dc.description.abstractThis paper presents an improvement to the performance of a biquad oscillator, which is a recursive oscillator known for its excellent long-term stability. However, a significant limitation is that the oscillation frequency cannot be changed while the system is operating. Directly changing the frequency during operation causes the amplitude of the generated signal to vary significantly, either increasing or decreasing. A zero-input response analysis is used to understand the cause of this problem and to develop a solution that allows the amplitude of the generated signal to remain constant even when the oscillation frequency is changed during operation. In addition, this paper presents a method for controlling the phase of the generated signal by using a 1st-order IIR phase shifter structure. The proposed structure is specifically designed to allow the phase of the signal at the oscillation frequency to be adjusted continuously and independently of the frequency parameter. This integrated oscillator enables real-time, independent control of both signal frequency and phase without amplitude drift, making it suitable for applications requiring precise and dynamic signal synthesis.
dc.identifier.citationElectronics Switzerland, 15(9), 2026
dc.identifier.doi10.3390/electronics15091932
dc.identifier.issn20799292
dc.identifier.other2-s2.0-105038461306
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/18068
dc.sourceElectronics Switzerland
dc.subjectallpass filter
dc.subjectamplitude stabilization
dc.subjectarbitrary phase shift
dc.subjectbiquad oscillator
dc.subjectdigital phase shifter
dc.subjectIIR filter
dc.subjectrecursive oscillator
dc.subjecttunable frequency
dc.subjecttunable phase
dc.titleContinuously Tunable Frequency and Phase Biquad Oscillator
dc.typeArticle

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