Abstract
DESIGN OF RING OSCILLATOR FOR HIGH FREQUENCY APPLICATIONS
*G. Ravikumar and V. S. N. Kumar Devaraju
ABSTRACT
We propose a ring oscillator designed with CMOS delay cells. It is important block in integrators and analog filters. The ring oscillator based integrators are the key elements in the analog filter design and read channels of disk drives, high-speed data links, loop filters for phase-locked loops, telephony, wireless communication systems, anti aliasing filters for digital audio, digital TV and HDTV, smoothing filters at the output of DAC's. Here we proposed a ring oscillator which can work at high frequencies. Here inverters are connected such that one stage output is connected to another stage form to obtain a three stage ring oscillator. The ring oscillator uses an odd number of inverters to give the effect of a single inverting amplifier with a gain of greater than one. The Ring oscillator is developed by using CADENCE Tool with a CMOS 180nm technology and is simulated using cadence spectre. The supply voltage was varied from 0.9 V in order to examine the frequency and power consumption of the circuit. The measured frequency had a range in MHz and the power consumption is 129uW.
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