Plenary Lecture

Research on Active Load Current Mode Amplifiers

Professor Luiza Grigorescu
Research Center for Mechanics of Machines and
Technological Equipments
University "Dunarea de Jos" of Galati
Calea Calarasilor 29, 810017, Braila
Romania
E-mail: lgrigorescu@ugal.ro

Abstract: The translinearity theory shows that an element is called „translinear” if it’s trans-conductance is linearly dependant on the current passing through it. Similarly a circuit component is translinear if the relationship between the current and voltage through it is an exponential one. Based on this principle there are now processes used in practice to design nonlinear functions by the use of translinear circuits. One of these is the active load current mode amplifier (current conveyor) that is the scope of this paper.
The circuit is made of a translinear loop, a current conveyor structure and a current mirror, replace-able also by a conveyor structure for a more acqurate fulfilment of the translinearity conditions.
This paper makes use of a theoretical representation of the amplifier to show that there are ways to reduce the errors from it’s transfer ratio.
The paper also presents the conclusions from the theoretical and experimental study of the amplifier and points out where necesary the similarities between the results obtained via the two approaches.

Brief Biography of the Speaker:
Luiza Grigorescu (born in 1954) is a Graduate Associate with the “Dunarea de Jos” University in Galati. She graduated in 1978 with a degree in electronics and telecom with the Gheorghe Asachi University in Iasi, and got a PhD in 2001 in Electronics and Telecommunications with the „Politehnica” University in Iasi, with a thesys on “New results in analyzing and designing of current-mode LC oscillators’’.
Starting 1997 she is a senior research scientist at the Research Center for Mechanics of Machines and Technological Equipments, at Engineering Faculty of Braila, University "Dunarea de Jos" of Galati, Romania. She is the author of several books and numerous research articles in referee journals and international conferences, covering the design and simulation of current mode circuitry and also the processing and reconstruction of signals.
Some articles stand out: Theoretical and Practical Aspects of Current Mode RC Oscillators, 4th IFAC Conference on Management and Control of Production and Logistics, Sibiu , Romania, 27-30 September, 2007, pg. 547-553, Design of current mode oscillators by current conveyors, Proceedings of the 1st WSEAS International Conference on Sensors and signal (SENSIG’08), Bucharest, Romania, November 7-9, 2008, Published by WSEAS Press, pg.16-20 , About Theoretical and Practical Aspects of Current Mode RC Oscillators Design, NAUN International Journal of Circuits, Systems and Signal Processing, issue 2, volume 2, 2008, pg. 140-150.
Also one should mention the books The Analysis and Design of LC Oscillators, Tehnica-Info Publishing House, Chisinau, 2005 and Signal Processing Techniques, Europlus Publishing House, Galati, 2007.