Design of AGC circuits for oscillator using current conveyor based translinear loops

Abstract

With the increasing demand of portable and battery driven devices a low voltage operating device has become necessary and for this current mode techniques are ideally suited. This thesis is focused on current conveyor based translinear (TL) loops in which a Second generation current conveyor (CCII) based on CMOS technology is studied. Using the same a new circuit of an integrator is implemented using log-domain principle. Further, three circuits for automatic gain control are proposed and implemented. All the proposed circuits are verified for the functionality using PSPICE and 0.18μm TSMC CMOS technology parameters.