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Second and fourth order reconfigurable filter structure implemented with second generation current controlled current conveyor is presented in this paper. Reconfigurable filter structure is widely used on the basis of the encrypted communication, cognitive radio and software defined radio systems. The designed filter is applied to the global positioning systems (GPS, GLONASS, Beidou, GNSS and Galileo)...
A 6th order bandpass continuous-time sigma delta modulator centered at 300MHz suitable for Software Defined Radio receiver is presented. This modulator is implemented in a standard low-cost 0.35µm CMOS technology. Several Q-enhanced LC resonators are implemented in a parallel structure using highly linear operational transconductance amplifiers (OTA), LC tank, and transconductor acts as a negative...
In first part of this paper the Maximum Power Point Tracking (MPPT) technique for photovoltaic (PV) panels based on Extremum Seeking Control (ESC) scheme is analyzed. It is important to know how much energy can be harvested from a PV that uses a MPPT controller. In this paper, the ESC schemes are analyzed in the frequency domain. The modified ESC (mESC) and high-order ESC (hoESC) schemes are considered...
This paper aims at compensating the dead-time effects in the vector-controlled induction motor system. It is used a feed-forward approach for the fundamental compensation and a feedback loop with adaptive GM filter and PI controllers for a harmonic compensation. The simulation results demonstrate the effectiveness of the proposed compensation strategy.
Four basic methods for measuring RF circuit frequency response were implemented and tested on the popular software defined radio system based on popular GNU-radio software package and on the Ettus USRP hardware. Properties, advantages and disadvantages of this solution were studied and are described in this paper. Using the proposed platform for measurement is interesting, because the equipment needed...
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