scholarly journals MULTI-CHANNEL DIGITAL-ANALOG SYSTEM BASED ON CURRENT-CURRENT CONVERTERS

2020 ◽  
Vol 10 (4) ◽  
pp. 43-46
Author(s):  
Olexiy Azarov ◽  
Yevhenii Heneralnytskyi ◽  
Nataliia Rybko
Keyword(s):  
Current Source ◽  
Bipolar Transistors ◽  
Current Generator ◽  
Output Resistance ◽  
Channel System ◽  
Analog System ◽  
Current Converter ◽  
System Mode ◽  
A Current ◽  
High Output

An approach to building a multi-channel digital-analog system is proposed, in which, unlike the known ones, a code-current converter, a controlled current generator, and also a current communication block are used. For a given accuracy, this saves on the analog system equipment. It has been shown that the proposed principle of building a controlled current source in the form of a highly linear push-pull amplifier – current scalar on bipolar transistors with a grounded load – has a high output resistance and wide bandwidth, which allows the use of current switching to implement the multi-channel system mode.

Design of a Current Source for Bioelectrical Impedance Measurement

2012 ◽  
Vol 239-240 ◽  
pp. 387-391
Author(s):  
Ke Ning Wang ◽  
Heng Zhao ◽  
Wei Wang
Keyword(s):  
Current Source ◽  
Impedance Measurement ◽  
Bioelectrical Impedance ◽  
Good Choice ◽  
Output Impedance ◽  
High Output Impedance ◽  
A Current ◽  
High Output

Current source with high output impedance is a key part in bioelectrical impedance measurement. In this paper, we presented a design of a current source based on the improved Howland current pump circuit. Then the performance of the proposed current source was simulated in Multisim software. The designed current source was implemented and its output impedance was tested. Both the simulated and tested results show that the proposed current source is a good choice for BI measurement.

A very high output resistance current source

2006 ◽  
Vol 18 (1) ◽  
pp. N9-N11 ◽  
Author(s):  
K Hayatleh ◽  
N Terzopoulos ◽  
B L Hart
Keyword(s):  
Current Source ◽  
Output Resistance ◽  
Very High ◽  
High Output

scholarly journals ANALYSIS AND DESIGN OF A HIGH PRECISION-HIGH OUTPUT IMPEDANCE TISSUE CURRENT DRIVER FOR MEDICAL APPLICATIONS

2014 ◽  
Vol 23 (08) ◽  
pp. 1450114 ◽  
Author(s):  
N. TERZOPOULOS ◽  
K. HAYATLEH ◽  
C. SEBU ◽  
F. J. LIDGEY ◽  
M. BEN-ESMAEL ◽  
...  
Keyword(s):  
Current Source ◽  
Output Impedance ◽  
Output Resistance ◽  
Impedance Tomography ◽  
Analysis And Design ◽  
Bipolar Technology ◽  
Operating Frequency Range ◽  
Driver Circuit ◽  
High Output Impedance ◽  
High Output

This paper describes the design and operation of a high output impedance tissue current driver circuit, for use in medical electronics, such as electrical impedance tomography (EIT). This novel architecture was designed for implementation in bipolar technology, to meet the specifications for EIT, namely operating frequency range 10 kHz–1 MHz with a target output resistance of 16 MΩ. Simulation results are presented, showing that the current source more than met the minimum specification for EIT.

scholarly journals Development and Research of a Current Source for Electrical Impedance Tomography

2019 ◽  
Vol 9 (2) ◽  
pp. 3816-3819
Keyword(s):  
Electrical Impedance Tomography ◽  
Experimental Evaluation ◽  
Electrical Impedance ◽  
Hardware Implementation ◽  
Block Diagram ◽  
Current Source ◽  
Output Resistance ◽  
Impedance Tomography ◽  
Experimental Bench ◽  
A Current

The probe current source is an essential component of equipment in electrical impedance tomography (EIT). This article discusses the development of a current source for an EIT - from a block diagram to a hardware implementation. A methodology for determining the output resistance of a current source is described, an experimental bench and the results of an experimental evaluation of the source output resistance - the most important parameter of current sources determining its characteristics - are presented.

scholarly journals Design of an Ultra-Low Voltage Bias Current Generator Highly Immune to Electromagnetic Interference

2021 ◽  
Vol 11 (1) ◽  
pp. 6
Author(s):  
Orazio Aiello
Keyword(s):  
Integrated Circuits ◽  
Electromagnetic Interference ◽  
Low Voltage ◽  
Current Source ◽  
Building Blocks ◽  
Cmos Technology ◽  
Threshold Region ◽  
Output Current ◽  
Current Generator ◽  
Technology Process

The paper deals with the immunity to Electromagnetic Interference (EMI) of the current source for Ultra-Low-Voltage Integrated Circuits (ICs). Based on the properties of IC building blocks, such as the current-splitter and current correlator, a novel current generator is conceived. The proposed solution is suitable to provide currents to ICs operating in the sub-threshold region even in the presence of an electromagnetic polluted environment. The immunity to EMI of the proposed solution is compared with that of a conventional current mirror and evaluated by analytic means and with reference to the 180 nm CMOS technology process. The analysis highlights how the proposed solution generates currents down to nano-ampere intrinsically robust to the Radio Frequency (RF) interference affecting the input of the current generator, differently to what happens to the output current of a conventional mirror under the same conditions.

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.

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