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A compact wideband microstrip bandpass filter is presented in the paper. A Tri-mode resonator is used to realize the compact single band filter, while input/output defected ground structure (DGS) Coupling structure is utilized to form a wideband filter. A prototype microstrip filter centered at 3.6 GHz with 45% fractional bandwidth is designed, fabricated and measured. Good agreement is found between...
Digital Down Conversion(DDC) is a key technology of Software Radio. Traditional implementations consume more resources and are difficult to achieve high Signal-to-Noise Ratio(SNR) gain. To solve this problem, an optimized filter structure of DDC for acquiring high SNR gain is presented. The effect of finite word length of filter coefficients and output rounding on the performance of DDC are investigated...
In connection with the multi-variable, strong coupling, nonlinear characteristics of the permanent magnet synchronous motor(PMSM) control system, the fuzzy control method has been introduced to tune the PMSM's control parameters. Based on model reference adaptive system (MRAS), this paper present a new method which combined both the fuzzy PI controller and the MRAS model. Some simulations has done...
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