Abstract—Voltage-Controlled Ring Oscillators are crucial components in many wireless communication systems. VCRO is used in PLL circuit, used to generate the oscillations and increase the speed of the whole system for RF wireless communication such as 60GHz communication systems. This kind of VCRO used in high-resolution oscillators for different applications. The goal of this project was to design a high speed, low power and minimum cell area, Voltage-Controlled Ring Oscillator in CMOS 0.18 micron technology that makes it suitable for wireless application. Designing of particular VCRO there are nine differential amplifier stages in cascading with each other and the output of last stage is again feedback to the input of the first stage. First according to the specification, the design of aspect ratio of the transistors used in our design is done. There were many challenges throughout the design process, including determining the matching requirements of the devices, investigating what percentage of segmentation to be used to design the whole system. For checking the functionality of the whole system a spice code is written using H-Spice by defining all blocks in the circuit as sub circuits, which are delay cell, bias and tuning circuitry. Then a schematic capture is done using schematic composer from virtuoso stating from bottom level to top level.
Index Terms—Ring based Voltage-Controlled Oscillator (VCO), Differential Amplifier(DA)
Cite: Puttaswamy G.C., Lakshmi Narayana C., and Cyril Prasanna Ra P. j, "Design and VLSI Implementation of VCO for High Speed RF Applications," International Journal of Engineering and Technology vol. 3, no. 3, pp. 244-248 , 2011.