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specialty journal of electronic and computer sciences
Volume 5, 2019, Issue 2
Designing the Ring-Type Voltage Controlled Oscillator
Saeid Niyakan‎
Pages: 67-84


A voltage controlled oscillator (VOC), in fact, is a generator of adjustable frequency. A ‎VOC is used as a key part in the phase lock ring, which is a system that generates a ‎sustained oscillating signal. Since the digital electronics industry needs a growing ‎increase of performance in speed, it is necessary that the VOCs generate the signals in ‎higher frequencies. But, as the frequency increases, the VOC phase noise decreases. ‎Even though there are two main types of VOCs i.e. ring and capacitive-inductive types, ‎in this research, the ring oscillator is designed and simulated using the Dual-gate ‎transistors. The results showed that, compared to MOSFET transistors, frequencies ‎could be generated using the dual-gate transistors. Then, various signals were ‎generated using the op-amp and frequency divider and also using the ring oscillator. ‎Finally, three outputs were weighted and summed and it was shown that oscillations ‎with three times of frequency could be generated using the weighted sum of the phase ‎shift oscillator output‎‎‎‎.

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specialty journal of electronic and computer sciences
Issue 1, Volume 7, 2021