DIGITALLY CONTROLLABLE CURRENT AMPLIFIER AND CURRENT CONVEYORS IN PRACTICAL APPLICATION OF CONTROLLABLE FREQUENCY FILTER
Josef Polak – Jan Jerabek – Lukas Langhammer – Roman Sotner – Jan Dvorak – David Panek
This paper presents the simulations results in comparison with the measured results of the practical realization of the multifunctional second order frequency filter with a Digitally Controlled Current Amplifier (DACA) and two Dual-Output Current-Controlled Current Conveyors (CCCII,±). This filter is designed for use in current mode. The filter was designed of the single input multiple outputs (SIMO) type, therefore it has only one input and three outputs with individual filtering functions. DACA element used in a newly proposed circuit is present in form of an integrated chip and the current conveyors are implemented using the Universal Current Conveyor (UCC) chip with designation UCC-N1B. Proposed frequency filter enables independent control of the pole frequency using parameters of two current conveyors and also independent control of the quality factor by change of a current gain of DACA.
Keywords: digitally adjustable current amplifier, current-controlled current conveyor, frequency filter, quality factor, pole frequency, single input multiple outputs