Centrum senzorických, informačních a komunikačních systémů

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    New Resistorless and Electronically Tunable Realization of Dual-Output VM All-Pass Filter Using VDIBA
    (Springer, 2013-01-07) Herencsár, Norbert; Minaei, Shahram; Koton, Jaroslav; Yuce, Erkan; Vrba, Kamil
    In this paper, a new active element called voltage differencing inverting buffered amplifier (VDIBA) is presented. Using single VDIBA and a capacitor, a new resistorless voltage-mode (VM) first-order all-pass filter (APF) is proposed, which provides both inverting and non-inverting outputs at the same configuration simultaneously. The pole frequency of the filter can be electronically controlled by means of bias current of the internal transconductance. No component-matching conditions are required and it has low sensitivity. In addition, the parasitic and loading effects are also investigated. By connecting two newly introduced APFs in open loop a novel second-order APF is proposed. As another application, the proposed VM APF is connected in cascade to a lossy integrator in a closed loop to design a four-phase quadrature oscillator. The theoretical results are verified by SPICE simulations using TSMC 0.18 um level-7 CMOS process parameters with +-0.9 V supply voltages. Moreover, the behavior of the proposed VM APF was also experimentally measured using commercially available integrated circuit OPA860 by Texas Instruments.
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    New Current-Mode Class 1 Frequency-Agile Filter for Multi Protocol GPS Application
    (Kaunas University of Technology, 2015-10-12) Atasoyu, Mesut; Metin, Bilgin; Kuntman, Hakan; Herencsár, Norbert
    Recently, due to their cost, accuracy, and integrability of conventional current-mode (CM) on-chip integrated filters working in radio frequency region, frequency-agile filters (FAFs) have started taking great interest in multi-standard transceivers, encrypted communication, cognitive radio, software defined radio structures, and global positioning system applications. By following the most recent trend in the literature, this paper proposes the first class 1 CM FAF using high-performance analog building block so-called positive-type electronically controllable second-generation current conveyor (ECCII+), two resistors, and two grounded capacitors. The theory and the proposed 2nd-order CM FAF are supported by both regular and post-layout simulations performed using CADENCE Spectre tool with TSMC 0.18 µm level-49 CMOS technology process BSIM3v3 parameters. Furthermore, corner and Monte-Carlo analyses are given to prove the accuracy of centre frequency of the CM FAF.
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    An electronically tunable current-mode quadrature oscillator using PCAs
    (Taylor & Francis, 2012-04-10) Herencsár, Norbert; Lahiri, Abhirup; Vrba, Kamil; Koton, Jaroslav
    The paper presents a new realization of active RC sinusoidal oscillator with electronically tunable condition and frequency of oscillation. As compared to the class of three resistors, two capacitors (3R-2C) based canonic oscillators, the proposed circuit here uses only two resistors and two capacitors as the passive components and still provides non-interactive tuning laws for the condition of oscillation (CO) and the frequency of oscillation (FO). The proposed circuit employs new bipolar programmable current amplifier (PCA) as the active building block and is capable of simultaneously providing two explicit quadrature current outputs. SPICE simulation results have been included to verify the workability of the circuit as an oscillator and the tuning range of the FO.
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    Fully differential first-order allpass filters using a DDCC
    (NISCAIR-CSIR, 2014-08-01) Horng, Jiun-Wei; Wu, Chang-Ming; Herencsár, Norbert
    Two voltage-mode high input impedance differential input-differential output first-order allpass filters based on differential difference current conveyor (DDCC) are presented. Each of the proposed circuit uses one plus-type DDCC, one grounded capacitor and three resistors. The proposed circuits enjoy the features of high input impedance, tunable of the allpass gains and using only grounded capacitors. The tracking error and sensitivity analysis of the proposed circuits are given. Simulation results confirm the theoretical analysis.
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    Grounded Voltage Controlled Positive Resistor with Ultra Low Power Consumption
    (Kaunas University of Technology, 2014-09-12) Yuce, Erkan; Minaei, Shahram; Herencsár, Norbert
    In this work, a new CMOS based grounded voltage controlled positive resistor (GVCPR) with one control voltage is proposed. The proposed GVCPR employs only five CMOS transistors, one operated in triode region and others operated in saturation region or OFF. One of the main properties of the proposed GVCPR is its ultra low power consumption; however, a single active component matching condition is needed. A number of SPICE simulation results using IBM 0.13 um SIGE013 level-7 CMOS process parameters such as its performance analysis and verification in tunable voltage-mode first-order all-pass filter and high-Q & high-gain voltage-mode multiple-feedback second-order band-pass filter are included to confirm the theory. The superior performance of the proposed GVCPR is also proven by numeric Figure of Merit calculation.