Advanced LIVA/TIVA Techniques

2001 ◽  
Author(s):  
R. Aaron Falk
Keyword(s):  
Integrated Circuits ◽  
Integrated Circuit ◽  
Current Source ◽  
Fault Isolation ◽  
Constant Current ◽  
Voltage Source ◽  
Constant Voltage ◽  
Constant Current Source ◽  
Current Sensing ◽  
Order Of Magnitude

Abstract LIVA (L ight I nduced V oltage A lterations) and TIVA (T hermally I nduced V oltage A lterations) have demonstrated significant capability for fault isolation. A difficulty with both techniques is their use of a constant current source, whereas integrated circuits operate with a constant voltage source. A new technique that utilizes the constant current sensing of LIVA/TIVA, while allowing for use of constant voltage bias on the integrated circuit, has been developed. As a bonus, the technique is also significantly more sensitive (at least one order of magnitude) than the standard LIVA/TIVA approach.

Design of Digital Control DC Voltage Source Based on AT89C52 MCU

2014 ◽  
Vol 484-485 ◽  
pp. 1126-1129
Author(s):  
Wei Wang
Keyword(s):  
Current Source ◽  
Step Function ◽  
Constant Current ◽  
Voltage Source ◽  
Constant Voltage ◽  
Good Reliability ◽  
Constant Current Source ◽  
Display Module ◽  
Dc Voltage ◽  
The Core

the system to DC voltage source as the core, AT89C52 MCU as the main controller, the output voltage to set the DC power supply through the keyboard, with a step function voltage to reality, the actual output value. This design is divided into four modules: SCM control and display module, digital to analog (D/A) conversion module, a constant voltage source module, output module. MCU control module as the core, the input signal is converted to digital quantity output; constant current source module voltage D/A conversion to analog conversion into constant pressure through a constant voltage circuit. The system has good reliability, high precision.

scholarly journals New Current-Mode Integrated Ternary Min/Max Circuits without Constant Independent Current Sources

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Mona Moradi ◽  
Reza Faghih Mirzaee ◽  
Keivan Navi
Keyword(s):  
Integrated Circuit ◽  
Power Dissipation ◽  
Field Effect Transistors ◽  
Current Source ◽  
Integrated Design ◽  
Current Mode ◽  
Constant Current ◽  
Constant Current Source ◽  
Static Power ◽  
Current Flows

Novel designs of current-mode Ternary minimum (AND) and maximum (OR) are proposed in this paper based on Carbon NanoTube Field Effect Transistors (CNTFET). First, these Ternary operators are designed separately. Then, they are combined together in order to generate both outputs concurrently in an integrated design. This integration results in the elimination of common parts when both functions are required at the same time. The third proposed current-mode integrated circuit generates both ternary operators with the usage of only 30 transistors. The new designs are composed of three main parts: (1) the part which converts current to voltage; (2) threshold detectors; and (3) the parallel paths through which the output current flows. Unlike the previously presented structure, there is no need for any constant current source within the new designs. This elimination leads to less static power dissipation. The second proposed current-mode segregated Ternary minimum operates 43% faster and consumes 40% less power in comparison with a previously presented structure.

Design of Low Power Lighting LED Driver with Multiplex Divided Constant Current Source

2013 ◽  
Vol 380-384 ◽  
pp. 3204-3208
Author(s):  
Fei Yu ◽  
Zhao Jie
Keyword(s):  
Low Power ◽  
Heat Dissipation ◽  
Low Cost ◽  
Current Source ◽  
Constant Current ◽  
Voltage Source ◽  
Led Driver ◽  
Constant Current Source ◽  
Good Efficiency ◽  
Driver Circuit

Low power lighting LED has the advantages of low cost and good heat dissipation. But the current driver for this kind of LED does not have a good efficiency. In this paper a new kind of LED driver circuit was designed. By using current mirror and PWM technique, the circuit has good efficiency. By simulation with PSPICE, we can prove that the circuit has can divide current equally and has a good performance while the voltage source has some jitters.

Study on the Application of High Precision Strain Acquisition System Based on Twin-Constant-Current Source

2013 ◽  
Vol 437 ◽  
pp. 399-403
Author(s):  
Zong Ju Hu ◽  
Zeng Yong Long
Keyword(s):  
Current Source ◽  
Acquisition System ◽  
Constant Current ◽  
Voltage Source ◽  
Constant Current Source ◽  
Strain Collection ◽  
High Measurement ◽  
Fan Blade ◽  
Lab Test ◽  
Deformation Tests

Aiming at the shortcomings of the constant voltage source strain acquisition system, the paper put forward a new strain acquisition technology based on the double-side half-bridge measurement of the constant current source. It has demonstrated and analyzed the advantages of constant current source circuit using for strain collection, and has raised the design of multi-channel strain acquisition system. Lab test and running in a large fan blade deformation tests showed that the strain acquisition system had high measurement precision, stability, anti-interference and reliability.

Design and Simulation of LED Drive Power Supply Based on ARM

2012 ◽  
Vol 588-589 ◽  
pp. 936-939
Author(s):  
Hong Li Cheng ◽  
Xiao Dan Ren ◽  
Shuai Sun
Keyword(s):  
Power Supply ◽  
High Efficiency ◽  
Current Source ◽  
Constant Current ◽  
Voltage Source ◽  
Drive Power ◽  
Small Current ◽  
Constant Current Source ◽  
Pid Algorithm ◽  
In Series

This paper introduces a kind of numerical controlled LED drive power supply based on ARM7. User can set the number and brightness of the LEDs to be lit by the remote control. Switching voltage source and the linear constant current source are connected in series, this circuit structure can ensure high efficiency and small current ripple. ARM7 completes the data collection, fuzzy PID algorithm processing, and real-time output adjustment. This paper explains the working principle of the system in detail and then simulates it in the simulink. The results show that it can satisfy the users' diverse requirements well and give full play to the convenience and controllability of the digital controller.

scholarly journals Low noise constant current source for bias dependent noise measurements

2011 ◽  
Vol 82 (1) ◽  
pp. 013906 ◽  
Author(s):  
D. Talukdar ◽  
R. K. Chakraborty ◽  
Suvendu Bose ◽  
K. K. Bardhan
Keyword(s):  
Current Source ◽  
Low Noise ◽  
Constant Current ◽  
Constant Current Source ◽  
Noise Measurements
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