Pandiev, Ivailo Milanov; Donevska, Lila Andreeva; Stamenov, Dimitar Iliev
Design and simulation testing of selective lc-amplifiers with active inductors
Proceedings of the Technical University – Sofia, 56(1), 2006, pp. 15-22
TU - Sofia
Analogue circuits; Selective LC-amplifiers; CFA; General impedance converter; Active inductor; Simulation
The present paper discusses the development of a specific type of selective LC amplifier with an active inductor and a current-feedback amplifier (CFA) with an additional port for control. The active inductor (gyrator) is built on the base of a general impedance converter (GIC), consisting of two op amps and RC-elements. The gyrator transforms the capacitance of the circuit to the emulated inductance. The main advantages of this new configuration are the insignificant influence of the load over the parameters of the amplifier and the possibility for independent tuning of the voltage gain and the Q-factor of the circuit. Some recommendations for designing this kind of analogue circuit are given, based on simulation results and symbol analysis of the transfer function. To confirm the validity of the design procedure, simulation results are compared with measurements of the electrical parameters in a practical LC amplifiers with small Q-factor and voltage gain, where a good agreement between simulations and measurements is found.
Reviewer prof. Elena Shoikova. - Formulas, schemes. - References, pp. 22