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Transactions: WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS
Transactions ID Number: 53-321
Full Name: Ben Salem Samir
Position: Doctor
(Researcher)
Age: ON
Sex: Male
Address: sfax, Hazeg, 3026
Country: TUNISIA
Tel: 21697556763
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E-mail address: samir.bensalem@isecs.rnu.tn
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Title of the Paper: A new CMOS Current Controlled Oscillator with Minimum Phase Noise Based on a New Low Parasitic Resistance CCII
Authors as they appear in the Paper: Samir Ben Salem,Achwek Ben Saied, Dorra Sellami Masmoudi and Mourad Loulou
Email addresses of all the authors:
Number of paper pages: 10
Abstract: Abstract---In this paper we present a design of a minimum phase noise current controlled oscillator in CMOS technology. Owing to their high degree of controllability, the second generation current conveyer is used as a basic block for our oscillator. Thus, the first step in our design was to improve static and dynamic behaviour of second generation current conveyers. We present therefore a design of CMOS class AB second generation current conveyors. The translinear implementation in CMOS technology was first studied and then a considerable improvement of the parasitic series resistance on port X is done by presenting a structure of CCII. With a control current of 300 µA, a reduction of RX by a factor of 10 is observed leading to a notable improvement of the frequency behaviour. This improved CCII version was used as a basic building block in the design of a new current controlled oscillator covering [100MHz-600MHz] frequency is presented. Phase noise characteristic!
s of the presented oscillator are investigated. We present then a new methodology of modelling and optimisation of phase noise of current controlled oscillators for CMOS process. This optimization strategy leads to a minimum phase noise acting on device geometries and design sources. PSpice simulation results are performed using CMOS 0.35 µm process of AMS.
Keywords: Key-Word--- Current Controlled Oscillators, Standard CMOS current conveyor, CCII, cascode structure, Conveyor characterization, RF application, Phase noise optimisation.
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