Improvement of the Oscillation Frequency Characteristic of Conventional Voltage Controlled Ring Oscillator
Intissar Toihria1, Rim Ayadi2, Mohamed Masmoudi3
1Intissar Toihria, Laboratory of Electronic and Micro-Technology Communication (ECM), National School Engineering of Sfax, Tunisia.
2Rim Ayadi, Laboratory of Electronic and Micro-Technology Communication (ECM), National School Engineering of Sfax, Tunisia.
3Mohamed Masmoudi, Laboratory of Electronic and Micro-Technology Communication (ECM), National School Engineering of Sfax, Tunisia.
Manuscript received on September 25, 2013. | Revised Manuscript received on October 11, 2013. | Manuscript published on October 30, 2013. | PP: 31-35 | Volume-3, Issue-1, October 2013. | Retrieval Number: A2136103113/2013©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: A new design of a Voltage Controlled Ring Oscillator is proposed in this paper in order to improve the oscillation frequency characteristic. The structure and the operation of proposed Voltage Controlled Ring Oscillator have been described. The new VCO is implemented and simulated by using ADS platform with 0.35μm AMS CMOS technology; this circuit uses relatively small devices dimensions and low power supply 2V to operate in a large range frequency. In addition, the proposed structure enables the output signal of the VCO to oscillates between ‘‘0’’ and ‘‘1’’ for each input value of control voltage Vinvco, varied between 0V to 1,3V, which is difficult to get from the Conventional Voltage Controlled Oscillator. Input control voltage of VCO, Vinvco, it is the analog voltage generated from the Loop Filter if a Voltage Controlled Oscillator circuit is use in Phase Locked Loops (PLLs) systems.
Keywords: Voltage Controlled Oscillator, Voltage Controlled Ring Oscillator, CMOS Inverters, Simple Mirror Current.