In this paper the method of fast impedance spectroscopy of technical objects with high impedance (|Z x | ≥ 1 GΩ) is evaluated by means of simulation and a practical experiment. The method is based on excitation of an object with a sinc signal and sampling the response signals proportional to current flowing through and voltage across the measured impedance. The object's impedance spectrum is obtained with the use of continuous Fourier transform on the basis of linear approximations between samples in two acquisition sections, connected with the duration of the sinc signal. The method is first evaluated in MATLAB by means of simulation. An influence of the sinc signal duration and the number of samples on impedance modulus and argument measurement errors is explored. The method is then practically verified in a constructed laboratory impedance spectroscopy measurement system. The obtained acceleration of impedance spectroscopy in the low frequency range (below 1 Hz) and the decrease of the number of acquired samples enable to recommend the worked out method for implementation in portable impedance analyzers destined for operation in the field.
In this paper, a new neural network architecture with two-center radial basis functions (TCRB functions, TCRBF) in the hidden layer was presented. The special shape of TCRB function was introduced to enhance the efficiency of soft faults classification in electronic analog circuits. The application of TCRB functions in neural network classifier gives possibility to reduce the number ofneurons in its hidden layer in comparison to radial basis function network with Gaussian basis functions. Additionally there is an improvement in testability of circuit under test (CUT) through decreasing the classification error. This article shows results obtainedfor lowpass 2th orderfilter.
New voltage controlled current source architecture of the LVDS driver was developed in digital 0.13um CMOS technology. It overcomes need of precise current biasing usually required by LVDS drivers. Test results show reliable operation for more than 1.2 Gbps data rate.
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