scholarly journals Digitally Controllable Current Amplifier and Current Conveyors in Practical Application of Controllable Frequency Filter

2016 ◽  
Vol 67 (4) ◽  
pp. 261-266 ◽  
Author(s):  
Josef Polak ◽  
Jan Jerabek ◽  
Lukas Langhammer ◽  
Roman Sotner ◽  
Jan Dvorak ◽  
...  
Keyword(s):  
Current Mode ◽  
Current Gain ◽  
Current Conveyors ◽  
Practical Realization ◽  
Frequency Filter ◽  
Practical Application ◽  
Independent Control ◽  
Current Amplifier ◽  
Single Input ◽  
A Current

Abstract This paper presents the simulations results in comparison with the measured results of the practical realization of the multifunctional second order frequency filter with a Digitally Adjustable Current Amplifier (DACA) and two Dual-Output Controllable Current Conveyors (CCCII +/−). This filter is designed for use in current mode. The filter was designed of the single input multiple outputs (SIMO) type, therefore it has only one input and three outputs with individual filtering functions. DACA element used in a newly proposed circuit is present in form of an integrated chip and the current conveyors are implemented using the Universal Current Conveyor (UCC) chip with designation UCC-N1B. Proposed frequency filter enables independent control of the pole frequency using parameters of two current conveyors and also independent control of the quality factor by change of a current gain of DACA.

Synthesis for Butterworth Filter Using Compact VDTA Based on Sallen- Key Topology

2020 ◽  
Vol 13 (5) ◽  
pp. 681-688
Author(s):  
Yong-An Li
Keyword(s):  
Network Theory ◽  
Current Mode ◽  
Second Order ◽  
Frequency Filter ◽  
Butterworth Filter ◽  
Admittance Matrix ◽  
Floating Capacitor ◽  
A Current

Background: The original filter including grounded or virtual ground capacitors can be synthesized by using the NAM expansion. However, so far the filters including floating capacitor, such as Sallen-Key filter, have not been synthesized by means of the NAM expansion. This is a problem to be researched further. Methods: By using the adjoint network theory, the Sallen-Key filter including floating capacitor first is turned into a current-mode one, which includes a grounded capacitor and a virtual ground capacitor. Then the node admittance matrix, after derived, is extended by using NAM expansion. Results: At last, one VDTA Sallen-Key filter is received. It employs single compact VDTA and two grounded capacitors. Conclusion: A Butterworth VDTA second-order frequency filter based on Sallen-Key topology with fo = 100kHz, HLP = -HBP=1, is designed.

THREE-INPUTS-ONE-OUTPUT CURRENT-MODE UNIVERSAL BIQUAD USING TWO CURRENT CONVEYORS

2013 ◽  
Vol 22 (09) ◽  
pp. 1340001 ◽  
Author(s):  
JIUN-WEI HORNG ◽  
TO-YAO CHIU ◽  
CHING-PAO HSIAO ◽  
GUANG-TING HUANG
Keyword(s):  
Integrated Circuit ◽  
Current Mode ◽  
Current Conveyors ◽  
Output Terminal ◽  
Biquadratic Filter ◽  
Component Matching ◽  
High Output Impedance ◽  
Very High ◽  
A Current ◽  
High Output

A current-mode universal biquadratic filter with three input terminals and one output terminal is presented. The architecture uses two current conveyors (CCs), two grounded capacitors and two grounded resistors; and can realize all standard second-order filter functions — highpass, bandpass, lowpass, notch and allpass. Moreover, the circuit still offers the following advantage features: very low active and passive sensitivities, using of grounded capacitors and resistors which is ideal for integrated circuit implementation, without requirements for critical component matching conditions and very high output impedance. The workability of the proposed circuit has been verified via HSPICE simulations using TSMC 0.18 μm, level 49 MOSFET technology.

scholarly journals A Current-Mode TransImpedance Amplifier for Capacitive Sensors

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1033
Author(s):  
Alessandro Nastro ◽  
Andrea De Marcellis ◽  
Marco Ferrari ◽  
Vittorio Ferrari
Keyword(s):  
Current Mode ◽  
Cmos Technology ◽  
Detection Sensitivity ◽  
Transimpedance Amplifier ◽  
Current Conveyors ◽  
Interface Circuit ◽  
Linear Behavior ◽  
Board Level ◽  
Voltage Conversion ◽  
A Current

A Current-Mode (CM) TransImpedance Amplifier (TIA) based on Second Generation Current Conveyors (CCIIs) for capacitive microsensor measurements is presented. The designed electronic interface performs a capacitance-to-voltage conversion using 3 CCIIs and 3 resistors exploiting a synchronous-demodulation technique to improve the overall detection sensitivity and resolution of the system. A CM-TIA solution designed at transistor level in AMS0.35 µm integrated CMOS technology with a power consumption lower than 900 µW is proposed. Experimental results obtained with a board-level prototype show linear behavior of the proposed interface circuit with a resolution up to 34.5 fF and a sensitivity up to 223 mV/nF, confirming the theoretical expectations.

scholarly journals Novel Current-Conveyor-Based Universal Current-Mode Biquad Filter with Three Inputs and One Output

1998 ◽  
Vol 20 (4) ◽  
pp. 235-240 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Hussain Abdullah Al-Zaher
Keyword(s):  
Second Generation ◽  
Current Mode ◽  
Current Conveyor ◽  
Current Conveyors ◽  
Independent Control ◽  
Biquad Filter

A novel universal current-mode filter with three inputs and one high imedance output is presented. The proposed circuit uses four plus-type second-generation current-conveyors, grounded resistors and grounded capacitors. The proposed circuit enjoys low active and passive sensitivities and independent control of the parametersω0/Q0using grounded resistors.

scholarly journals An Example of Easy Synthesis of Active Filter and Oscillator using Signal Flowgraph Modification and Controllable Current Conveyors

2011 ◽  
Vol 62 (5) ◽  
pp. 258-266 ◽  
Author(s):  
Roman Šotner ◽  
Zdeněk Hruboš ◽  
Břetislav Ševčík ◽  
Josef Slezák ◽  
Jiří Petržela ◽  
...  
Keyword(s):  
High Frequency ◽  
Current Mode ◽  
Basic Structure ◽  
Active Filter ◽  
Current Gain ◽  
Current Conveyors ◽  
Signal Flow Graph ◽  
Graph Design ◽  
Order Structures ◽  
Frequency Current

An Example of Easy Synthesis of Active Filter and Oscillator using Signal Flowgraph Modification and Controllable Current Conveyors The paper deals with synthesis of active frequency filters and oscillators for applications in the video band. The synthesis is based on the modified signal flow graph design approach in the current mode. The commercially available high frequency current conveyors and second order structures are used. Basic structure is employing loss-less and lossy current mode integrators in two distributed feedback loops. Some of the used active elements allow to control current gain which is very useful in applications. High frequency multi-functional filter and electronically adjustable quadrature oscillator configurations are discussed. Most of the used passive elements (mainly capacitors) are grounded which is suitable for IC implementation. Simulation and experimental results demonstrate function and features very well.

scholarly journals Current mode approach: High performance 0.35 μm CMOS class AB push-pull current amplifier

2003 ◽  
Vol 16 (2) ◽  
pp. 195-204
Author(s):  
Lyes Bouzerara ◽  
Mohand Belaroussi
Keyword(s):  
High Performance ◽  
Supply Voltage ◽  
Current Mode ◽  
Current Gain ◽  
Design Parameters ◽  
Power Supply Voltage ◽  
Current Amplifier ◽  
Class Ab ◽  
Current Mirrors ◽  
General Circuits

A very high bandwidth class AB (Push-Pull) current amplifier using the compensation resistor technique is presented and analyzed. Such technique stands as a powerful method of bandwidth enhancement for general circuits using CMOS current mirrors. The proposed bandwidth is enhanced from 675 MHz for the uncompensated current amplifier to 745MHz for the compensated one without affecting the current gain and other design parameters such as power consumption and output swing. The circuit exhibits a current gain of 20 dB and consumes 1.48 mW for ?2.5V power supply voltage. All simulation results were performed using Hspice tool with 0.35^m CMOS TSMC parameters.

Fabrication and Characterization of Single-crystal CVD Diamond Current Amplifier

2011 ◽  
Vol 1282 ◽  
Author(s):  
Joan E. Yater ◽  
Jonathan L. Shaw ◽  
Kevin L. Jensen ◽  
Tatyana Feygelson ◽  
Robert E. Myers ◽  
...  
Keyword(s):  
Electron Beam ◽  
Single Crystal ◽  
Diamond Film ◽  
Secondary Electron ◽  
Cvd Diamond ◽  
Current Gain ◽  
Internal Electric Field ◽  
Current Amplifier ◽  
Current Amplification ◽  
A Current

ABSTRACTHigh-current-density cathodes are required for the development of high-power mm-wave and upper mm-wave devices, as well as for other electron beam applications. To address this need, a current amplifier stage is being developed that will multiply a primary electron-beam current (via the secondary-electron multiplication process) and then emit the amplified beam so as to achieve a current gain of 50-100. Diamond is a particularly promising current amplification source due to the negative electron affinity present at stable hydrogenated surfaces. As such, we are fabricating current amplifiers using single-crystal CVD diamond grown at NRL, with our growth effort focused on reducing the impurity concentration in the epitaxial diamond and on fabricating microns-thick freestanding films. The current amplification characteristics of the diamond films are examined using secondary-electron-emission measurements in both reflection and transmission configurations. In our initial study of an 8.3-µm-thick CVD diamond film, the single-crystal diamond is shown to have superior transport and emission properties compared to similar polycrystalline material. While transmission gains have been obtained under field-free conditions from the unbiased diamond film, we are striving to increase the gain by increasing the transport efficiency in a biased amplifier structure. Towards this end, recent efforts have focused on optimizing the bonding and metallization processes as needed to establish and control the internal electric field. In addition, Monte Carlo simulations are being used to predict the optimal material and device parameters needed to achieve high amplifier gain and low energy spread.

scholarly journals New Universal One-Input Five-Output Current-Mode Filter Using Current-Conveyors

1995 ◽  
Vol 18 (3) ◽  
pp. 171-177 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Aamir Alam Farooqui
Keyword(s):  
Current Mode ◽  
Current Conveyors ◽  
Output Current ◽  
Biquadratic Filter ◽  
Single Input

A new universal active current-mode filter with single input and five outputs is presented. The proposed filter avoids the use of feedback in any part of the circuit and uses only grounded resistors and grounded capacitors. The proposed circuit can simultaneously realize lowpass, highpass, bandpass, allpass, and notch biquadratic filter functions.

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