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In this study, a new voltage-mode fractional-order oscillator using two unity-gain voltage buffers, two operational transconductance amplifiers, one resistor, and two capacitors is presented. The design procedure of integer-order as well as fractional-order oscillator employing in total 20 MOS transistors is discussed. Effects of fractional-order capacitors on amplitude, phase, condition of oscillation,...
This paper presents synthesis of analogue frequency filter with differential input and differential output terminals. The inner structure of the filter has single-ended form, i.e. filter behaves as so-called pseudo-differential circuit. Active elements of the filter are Differential Voltage Buffer (DVB) as an input stage and Modified Current Differencing Unit (MCDU) together with Modified Current...
In modern spectral network analysis a particular spectral component needs to be extracted precisely in order to measure electrical quantities on the physical level of data networks, e.g. IEEE 802.11, 802.16 etc. Due to these facts, high-speed analog filters with satisfactory features are required. A new active device, UCCX, is presented as suitable for VHF current-, voltage-, and mixed-mode applications...
This paper deals with resistorless lossless floating/ grounded inductance simulator and its application to third-order voltage-mode elliptic low-pass and band-pass filters providing high linearity and wide bandwidth in high frequencies. The inductance simulator circuit consists of only one grounded capacitor, single dual-output current follower (CF±), and one high-performance and versatile active...
This paper presents a new circuit realization capable of simultaneously realizing all three current-mode first-order filtering functions, namely the low-pass (LP), high-pass (HP), and all-pass (AP). The proposed circuit is created using three programmable current amplifiers (PCAs) and only two passive components, which includes one resistor and one capacitor. LP and HP filters have independently tuneable...
In this paper voltage-mode fractional-order low- and high-pass filters using universal voltage conveyors are presented. The assumed order of the filters is (1 + α), where 0 < α < 1. The proposed structures use the continued fraction expansion approach and hence the fractional-order transfer functions of the filters are approximated by integer-order functions. The proposed structures are easily...
This paper presents possible solution of fractional-order low-pass filter (FLPF) with electronically adjustable order between 1 and 2 and with also electronically adjustable pole frequency. It is based on well-known follow-the-leader feedback (FLF) topology adjusted in our case for utilization with operational transconductance amplifiers (OTAs) and adjustable current amplifiers (ACAs). This 3rd-order...
The paper deals with the novel filtration techniques for analog high-speed data signal preprocessing working on the base of a pure current mode filters. The paper describes a novel structure of the universal multifunction filter working in the pure current mode. Due to better frequency features of the current mode and a tendency to reduce the supply voltage because of the technology used (where in...
Based on the fifth-order voltage-mode low-pass LC ladder structure the active only grounded-C equivalent circuit solutions are presented. As active building blocks the current follower transconductance amplifiers (CFTAs) are used. Using the signal flow graph approach, the initial solution using nine active elements is further optimized to a more simple topology employing only six active elements and...
Actively simulated grounded floating capacitance multipliers have been used in several applications ranging from filter to oscillator design as well as cancellation of parasitic capacitances. In this paper, a new electronically-controllable floating lossless capacitance multiplier (C-Multiplier) circuit is presented, which employs only one Voltage Differencing Current Conveyor (VDCC), one grounded...
The main aim of this work is to investigate electronically adjustable properties of discussed simple transfer sections i.e. all-pass and bilinear filters and their practical verification. Signal-flow graph (SFG) approach was used for better understanding of circuit design and its principle. Simultaneous and separated control of the zero and pole frequencies is available, thus this circuit is favorable...
In this study, a low-voltage design of a new general floating element simulator circuit for realizing floating frequency dependent negative resistor (FDNR), floating inductor (FI), floating capacitor (FC), and floating resistor (FR) simulator, depending on the selection of passive circuit elements, is described. The circuit employs two voltage differencing current conveyors (VDCCs) at low voltage...
In this paper, a new RC circuit realization of voltage-mode (VM) first-order all-pass filter (APF) is presented. The proposed VM APF scheme is composed of a single grounded capacitor, three resistors with one being negative. The main advantage of the circuit is the common ground terminal between the input and the output. For proper functionality passive element matching is required and the negative...
This paper introduces behavioral model of advanced type of current conveyor with extended controllable inter-terminal features. This type of active device offers three independent current input terminals (X), all with adjustable input resistance RX where currents from all X terminals are weighted in independent branches by electronically adjustable current gains (B) and summed in the output node....
Simple multiphase second-order oscillator based on special active device, so-called Z-copy Voltage Controlled Current Follower Differential Input Transconductance Amplifier (ZC-VCCFDITA) is present in this contribution. Simple linear control of oscillation frequency by DC voltage is easily possible. Simple automatic gain control circuit (AGC) for amplitude stabilization is also presented. Three output...
This contribution introduces behavioral model of multi-terminal active device providing electronically adjustable control of its parameters so-called Z-copy Voltage Controlled Current Follower Differential Input Transconductance Amplifier (ZC-VCCFDITA). Behavioral model is based on elements available in standard PSpice libraries in order to show that modeling of elements, blocks and sub-blocks representing...
The paper deals with current state of card based PAC (Physical Access Control) systems, especially their level of security and provided mechanisms for protecting users' privacy. We propose to use ABCs (Attribute-Based Credentials) to create Privacy-PAC system that provides greater protection of user privacy compared to classic systems. We define basic requirements for Privacy-PAC and provide a comparison...
The paper deals with privacy-preserving and secure electronic voting systems. We propose a novel privacy-preserving and secure Internet e-voting solution which is based on modern cryptographic schemes. Our solution employs ElGamal encryption with a group signature scheme to keep the user privacy and ballot authenticity and confidentiality. The solution provides a user revocation which can be done...
This contribution presents two behavioral models of voltage-controlled generalized current conveyors of the second generation based on the commercially available devices. The prepared models are suitable for the practical experiments, before expensive fabrication of transistor-level implementation of whole active device is performed. Both models offer three standard terminals (X — current input terminal,...
In this paper, basic transconductor composed of only p-channel and n-channel metal-oxide-semiconductor field-effect transistors (MOSFETs) and its utilization for low-voltage first-order voltage-mode (VM) all-pass filter (APF) design is studied. For initial filter design a general structure employing single transconductor and two admittances was proposed. By choosing passive components and considering...
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