frequency limitation
1.To deal with the frequency limitation of the multi output OTA based filters, a novel canonical realization of continuous time current mode CMOS OTA C biquad filter based the elementary operational transfer amplifier (OTA) with the only one output is proposed employing SFG (signal flow graph) and a various different kind of biquadratic filters is generated systematically.
2.The article analyses the traditional principle of arc coil automatic tuning, points out its limitation,sets an automatic tuning method of external signal scanning frequency arc coil, states the principle and computing formula of external signal scanning frequency and measuring,and eliminates the wearing to the contact point and the limitation of shift adjustment .
3.In view of the existing problems in the thyrister medium frequency power supply applied in the GW 0 5 t coreless induction furnace,the limitation of the inner and outer bridge starting circuit to suit the changing of load is analysed. The reformation to the thyristor medium frequency power supply with the precharge starting circuit and the trial operation results are summarized.
4.The main limitation of a Intensity-Modulated- Continuous-Wave laser rangefinder is the leakage distortion created by the high frequency current source which modulates the laser diode.
5.On the basis of the summarization of the excellences and limitation of all kinds of time-frequency analysis theory, this dissertation discusses thorough the application in extracting of feature information in EEG signals of Gabor transform, wavelet and wavelet packet transform, Wigner distribution and Choi-Williams distribution, Matching Pursuit(MP), Independent Component Analysis(ICA), multi-resolution time-frequency analysis based on wavelet packet decomposition and short time Fourier transform(STFT), and ANN.
6.In light of the limitation of Fast Fourier Transform (FFT) for the method of traditional spectrum analysis to analyze the unsteady signal, wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two-row placed units in Lijiaxia Hydropower Station, in which the signal is decomposed into different frequency band, and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source.
7.The transient analysis and simulation studies in time-domain showed that the transient capacitance current of busbar is unable to be caught due to the limitation of the given sampling frequency, therefore the transient current singularity of the fault line and the non-fault line will approximate, which prevents to identify the fault line with the criterion calculation result of transient current protection.
