Hassan Fathabadi

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In this paper, a necessary and sufficient condition for robust stability of electronic circuits at high frequency, which contain differential pair (emitter–coupled pair), is proposed. In fact, when emitter– coupled pairs are used as one input signal–one output signal, they have uncertainty in their transfer functions at high frequency. Even it is shown that(More)
In this study, two approaches are presented to detect short-circuit faults in power transmission lines. The two proposed methods are completely novel from both theoretical and technical aspects. The first approach is a soft computing method that uses discrete wavelet transform with Daubechies mother wavelets db1, db2, db3, and db4. The second approach is a(More)
  • H. Fathabadi
  • 2008 International Conference on Computer and…
  • 2008
We consider a real signal which has been sampled synchronously and uniformly at two sampling frequencies, the first equal to its bandwidth, and the second to 150% of its bandwidth. Therefore the two corresponding discrete-time signals are undersampled versions of the original analog signal. First a set of equations will be proposed to reconstruct the(More)
In this paper, we consider a designed and implemented phase-cutting dimmer. In fact, the dimmer is closed loop and a microcontroller calculates and then regulates the firing delay angles of each channel. Depending on the firing angle, the harmonic distortion in the input current will not comply with international standards, such as IEC 61000-3-2 (class C(More)
In this paper, we consider a signal which has been sampled synchronously with sampling frequencies equal to bandwidth (B.W) and 1.5 B.W. So, sampling is uniform and sampled signals are undersampled. Then two undersampled signals will be transmitted by two parallel transmission channels that the bandwidth of each channel is only %50 of bandwidth of the(More)
In this paper, we consider a designed and implemented dimmer. The dimmer is closed loop and phasecutting type. In fact, a microcontroller calculates and then regulates the firing delay angles of eight triacs. Depending on the firing angle, the harmonic distortion in the input current will not comply with international standards, such as IEC 61000-3-2(class(More)