Abstract
In electrical and electronic engineering, the filter is very importance circuit. A voltage-mode three inputs single output second-order multifunction filter is presented in this paper. The proposed filter is based on RLC parallel circuit. The main active element is the commercially available IC from Linear Technology Inc, LT1228. The filter consists of single LT1228, single resistor and two capacitors. Five output second-order filter responses, namely band-pass (BP), band-stop (BS), high-pass (HP), low-pass (LP) and all-pass (AP) functions are achieved. Each output response can be selected without component matching condition and the requirement of double gain amplifier. The quality factor and natural frequency can be electronically controlled. PSpice simulation results suing macro model of LT1228 are in close agreement with the theory.
Highlights
In electrical and electronic engineering, the biquadratic or second order filter has been important building blocks [1]
The contribution of this paper is to propose a second order voltage-mode multiple-inputs singleoutput (MISO) multifunction filter using commercially available IC, LT1228 [16] as the active element
The selection of filter response can be done without the requirement of double gain amplifier
Summary
In electrical and electronic engineering, the biquadratic or second order filter has been important building blocks [1]. In case of voltage mode MISO, the selection of output voltage by switching on or off the input voltages should be done without the matching condition of passive and active elements. There are a lot of MISO universal filters [2]-[15] These MISO universal filters have some drawbacks for example, need of matching condition, requirement of additional double gain amplifier, electronic uncontrollability, requirement of many active and passive element. The active elements used in some previous MISO universal filter are not commercially available. The contribution of this paper is to propose a second order voltage-mode MISO multifunction filter using commercially available IC, LT1228 [16] as the active element.
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