In order to implement sampling wide band signal, the random sampling method is always taken in designing of the Digital Storage Oscilloscope(DSO). The exact definition of equivalence sampling and random sampling is given in this article. It discusses the realization methods of random sampling and gives a new random sampling method with self calibration capability. With this method, the errors will be reduced as well as the sampling rate is improved.
Time synchronization based on IEEE 1588 synchronization protocol aims to synchronize the slave clock to the master clock. Conventional synchronization algorithm focuses on calibrating offset of the slave clock with respect to the master clock. In this paper, a novel method of time synchronization is proposed, the proposed method improves the synchronization precision by considering both offset calibration and drift compensation. Asymmetric communication between downlink and uplink data rate is employed in time synchronization. Experimental results indicate that our proposed method can reduce the increase speed of offset between the slave clock and the master clock, and it outperforms the conventional synchronization method.
This paper describes the development of a sub-Nyquist sampling system that can digitize high-speed signals using a low-speed analog to digital converter (ADC). The system is implemented by a field programmable gate array (FPGA), and it is possible to make change to the equivalent sampling frequency according to the practical applications. As an application of the compressed sensing (CS) theory, for the spectrally sparse analog signal sampling, the proposed system has the potential to break though the constraint of Shannon theorem and the bandwidth barrier of state-of-the-art ADCs. Potential limitations of the applicability of CS-based sampling system are also discussed. Experimental results show that this sampling system is able to capture spectrally sparse analog signal at an equivalent sampling rate of 500 MHz while sampled at a rate of no more than 100 MHz physically.
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