Abstract
Voltage Controlled Oscillator (VCO) is key building block of Phase Locked Loop (PLL) and Radio Frequency (RF) communication system. The design of high performance VCOs has been increasingly more important and still is an active research area. Research on VCOs for the past decade has been concentrated in the areas of higher frequency, lower phase noise, low power, low operating voltage, and increased tuning range. Among the architectures of VCO, Ring Oscillator shows better performance so it is selected for the research. The VCO exhibit at high frequency tuning range from 1.06-1.17GHz; its power consumption is only 8.63mW.The circuit is simulated in Tanner Tool version-13environment. The optimization design and layout are done using S-EDIT software to make the oscillator as small as possible. In addition, T-spice and W-EDIT tools are used in the analysis and simulation to verify the predicted performance. Index Terms- CMOS, Phase noise, ring oscillator, voltage controlled oscillator (VCO).
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