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A Highly Linear Low Pass Filter for Low Voltage Reconfigurable Wireless Applications

Csipkes G., Hintea S., Csipkes D., Rus C., Festila L., Fernandez-Canque H.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 2

76-81

This paper presents a reconfigurable and programmable analogue low pass filter for low voltage wireless applications. The proposed filter may be used for channel or band selection in multi-mode receiver front ends employing direct frequency conversion. The circuit has been synthesized using state variables and leapfrog OTA-C techniques, features programmable order, digitally variable frequency parameters and wide linear range. The fundamental OTA cell has been implemented with fully balanced second-generation current conveyors, suitable for operating with low supply voltages. Transistor level simulations based on a 180 nm digital CMOS technology have demonstrated the functionality of the design.