Title :
Simple VCO with negative voltage-frequency relation
Author :
Pongswatd, Sawai ; Julsereewong, Amphawan ; Tirasesth, Kitti ; Sasaki, Hirofumi ; Shi, Yan
Author_Institution :
Fac. of Eng., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok
Abstract :
A simple voltage controlled oscillator (VCO) with negative voltage-frequency (V-F) relation is presented in this paper. The realization technique is based on the use of commercial available devices to generate tunable sawtooth and square wave signals. Decreasing the control voltage linearly increases the output oscillation frequency. The proposed VCO consists of operational transconductance amplifiers (OTAs) and an RS Flip Flop. Experimental results showing the circuit performances are agreed with the expected values. The usefulness of the proposed circuit is demonstrated through application example with reducing the output ripple waveforms of a buck converter.
Keywords :
amplifiers; flip-flops; power convertors; realisation theory; voltage-controlled oscillators; RS flip flop; buck converter; negative voltage-frequency relation; operational transconductance amplifiers; output oscillation frequency; output ripple waveforms; realization technique; simple voltage controlled oscillator; square wave signals; tunable sawtooth signals; Bandwidth; Buck converters; Frequency modulation; Operational amplifiers; Roentgenium; Signal generators; Transconductance; Tunable circuits and devices; Voltage; Voltage-controlled oscillators; OTA-based circuit; RS Flip Flop; VCO;
Conference_Titel :
Control, Automation and Systems, 2008. ICCAS 2008. International Conference on
Conference_Location :
Seoul
Print_ISBN :
978-89-950038-9-3
Electronic_ISBN :
978-89-93215-01-4
DOI :
10.1109/ICCAS.2008.4694482
