Voltage-Controlled Sinusoidal Oscillator Using Commercially Available ICs with Amplitude Adjustability and Its Application to FM and FSK Modulations for Transmission and Processing of Identified Low-Frequency Signals

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dc.contributor.authorSuwanjan, Peerawut
dc.contributor.authorAdhan, Suchin
dc.contributor.authorChaichana, Amornchai
dc.contributor.authorSotner, Roman
dc.contributor.authorNramat, Wichai
dc.contributor.authorJaikla, Winai
dc.date.accessioned2026-08-06T10:55:10Z
dc.date.available2026-08-06T10:55:10Z
dc.date.issued2026-04-01
dc.description.abstractThis paper presents a new voltage-controlled sinusoidal oscillator employing only two commercially available LT1228 integrated circuits, four resistors, and two capacitors. The proposed oscillator provides independent control of oscillation frequency and oscillation condition, as well as adjustable output amplitude, while maintaining low output impedance without requiring additional active components. The oscillation frequency is electronically and linearly tuned via the LT1228 bias current or control voltage. Experimental results confirm the practicality of the design: The proposed VCO achieves a wide linear tuning range from 9.25 kHz to 837.2 kHz, THD below 2.55%, and phase noise of –73.35 dBc/Hz at a 1 kHz offset for a 237.8 kHz carrier. The amplitude of the sinusoidal output is adjustable from 0.48 Vp-p to 6.64 Vp-p. In addition, the proposed VCO is successfully applied to FM and FSK modulation for low-frequency signal transmission, and the FM demodulation test yields a recovered sawtooth signal with an SNR of 34.51 dB. Compared with existing LT1228-based oscillators, the proposed circuit achieves 25% lower power consumption (149 mW) and reduces the number of ICs required while improving functional versatility. These results validate the effectiveness and novelty of the proposed LT1228-based design.
dc.identifier.citationArabian Journal for Science and Engineering, 51(8), 11379-11396, 2026
dc.identifier.doi10.1007/s13369-025-11015-x
dc.identifier.issn2193567X
dc.identifier.other2-s2.0-105026303910
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/18015
dc.sourceArabian Journal for Science and Engineering
dc.subjectCommercially available IC
dc.subjectFM modulation
dc.subjectFSK modulation
dc.subjectProcessing of identified low-frequency signals
dc.subjectVoltage-controlled oscillator
dc.titleVoltage-Controlled Sinusoidal Oscillator Using Commercially Available ICs with Amplitude Adjustability and Its Application to FM and FSK Modulations for Transmission and Processing of Identified Low-Frequency Signals
dc.typeArticle

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