ANALYSIS OF A DELAY CELL BASED VOLTAGE CONTROLLED RING OSCILLATOR IN CMOS
JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES
Oscillators are used to convert Direct Current (DC) from power supply to an Alternating Current (AC) signal. Oscillatory behavior is ubiquitous in all physical systems, especially in electronic and optical. This paper present a inverter based (three stage) and delay cell based (three and five stage) Ring Oscillators (ROs).ROs was simulated using Cadence tools and its performance was evaluated based on different parameters having with 7.79GHz frequency (90nm technology), wide tuning-range from
... .58 GHz to 16.62 GHz (90 nm technology), Phase noise of -101dBc/Hz (90 nm technology) and average power of 8.83µW (45 nm technology) .All these parameters are analyzed using CMOS technologies in 45nm, 90nm and 180nm technologies. The key metrics of a RO consist of oscillation frequency, tuning range, phase noise, and power consumption.Most oscilla range [I]. PLLs are common applications for ROs. PLLs [IV] can be used for clock generations, such as in a microprocessor, clock and data recovery circuits, an optical transmission system, frequency synthesis, a for ROs used in PLLs is wide tuning range so that the entire frequency range is covered. Also the phase noise requirement of the RO can be loosened due to that when the loop is locked, the noise generated by the R frequency will be filtered out by the loop bandwidth. As a result, PLLs generally use wide tuning range ring topology RO [V]. This paper is organized as follows. Section II describes RO using basic inverter chain. Section III describes three describes five-stage RO using differential and the conclusions is given in Section V.