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In this paper, fractional spur suppression techniques for all-digital PLLs (ADPLLs) are summarized. The attention is paid to the recently proposed digital-to-time converter (DTC)-based ADPLL architecture. DTC's nonlinearity dominates the fractional spurs contribution. Its influence is modeled with a pseudo phase-domain ADPLL and its relationship with the spur level is quantitatively described. An...
A novel planar electromagnetic bandgap` structure with hybrid bridges (HB-EBG) is proposed by integrating two different kinds of S-shaped bridges for ultra-wideband simultaneous switching noise (SSN) suppression in multilayer PCBs. −40 dB stopband is achieved from 218 MHz to 15 GHz. Compared with the EBG structure with L-shaped bridges and slits (LBS-EBG), the lower cutoff frequency decreases from...
The echo signal of electromagnetic acoustic detection have a small amplitude and a low SNR. By means of wavelet transform (WT) and ensemble empirical mode decomposition (EEMD), an electromagnetic acoustic echo signal was analyzed and the results show that both WT and EEMD are efficient ways for processing non-stationary signals. Conclusion can be made the EEMD is more adaptive than WT analysis in...
A low noise amplifier(LNA) working at GPS L1 band was designed using TSMC 0.18 μm CMOS process with inductively source-degeneration cascode topology. The design process was given firstly and then improved after considering the parasitics resulting from ESD protection circuit and package PAD. Simulation results show that the parasitic effects coming from ESD protection circuit and package PAD should...
The feature points extraction is a foundation for feature based SAR images registration, the quality of feature points directly determines the accuracy of registration. Current SAR feature points extraction algorithms are mainly shifted from optical image corresponding algorithms, accordingly feature points extracted with these algorithms are not only impacted by the speckle noise, but also not able...
A novel diagnosis method is proposed based on the Kullback-Leibler (KL) divergence information for fault diagnosis of the diesel engine. A skewness wave (SW) is defined in the time domain using the vibration signal, and a method to obtain the skewness information wave (SIW) is also proposed. Practical example of diagnosis for a bearing used in a diesel engine is provided to verify the effectiveness...
In the direct spreading spectrum the several errors will lead to sharp decrease of peak-to-sidelobe ratio and the errors sometimes cannot be corrected. To solve this problem, a new method of Bark and M-sequence Spread Spectrum (i.e. BMSS) with error-correcting ability is proposed. The new BMSS method not only performs better than Direct Sequence Spread Spectrum (DSSS) in the similar condition, but...
Data acquisition technology based on long distance wireless network is one of the hot research problems of data acquisition technology at the present time. This paper applies data acquisition technology based on GPRS to automatic collection of noise data, designs encapsulation format of data. Data collection terminal accesses to network through GPRS to upload noise data to database of remote server...
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