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Data converters are essential gateways leading an analog signal into a digital format. Data converters are more and more important for electrical and optical communication systems where the analog signals must be transformed in analog at the very beginning of the processing chain. The use of advanced modulation schemes lead to a pressing request for power efficient A/D converters operating with a...
The main goal of this paper is investigation of the fault coverage dependence on the value of the oscillation frequency in oscillation-based tests of analog circuits. For this purpose, an operational amplifier designed in 90 nm CMOS technology was used as a Circuit Under Test (CUT) in our experiment. Then, the CUT was transformed into an oscillator and different catastrophic faults were considered...
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)...
This paper describes a embedded controller for the matrix converter. Thanks to its computing throughput it is suitable for university use, but it enables operation in the whole industrial rage thank to its construction. Besides the example usage in matrix converter, the control system is generally usable for various control tasks.
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...
This article describes the design of increase of the safety of human-robot cooperation. In this variant is besides maintaining the minimum weight of the moving parts used the flexible joint, which rigidity is adjustable. The article presents a new method in which is the mechanical spring replaced by electro-dynamic coupling. This way of dealing increases the speed of the regulation and expands the...
Micro-Electro-Mechanical-Systems (MEMS) accelerometers have great potential in many applications such as remote infrastructure monitoring, automotive industry and also in military and surveillance systems as a part of the Unattended Ground Sensor (UGS) systems. A detection of human activity and vehicle movement in monitored area using seismic signals is complex problem and it brings new challenges...
The paper derives mathematical conditions for the occurrence of touching points on the hysteresis loop of an ideal voltage-controlled memristor driven by the sinusoidal voltage.
Crossing-type and non-crossing-type touching points of higher orders of a pair of arms of memristor pinched hysteresis loop are analyzed. Mathematical conditions of the occurrence of these points are derived for ideal voltage-controlled memristor driven by the sinusoidal voltage.
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...
In the second part of this paper the Maximum Power Point Tracking (MPPT) technique for photovoltaic (PV) panels based on modified Extremum Seeking Control (mESC) is analyzed. Even the mESC scheme differs from the classical ESC schemes only on the filters' topology and their used parameter, this proposed control improves quite enough the performances of the PV energy harvesting in comparison with a...
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