Zhao Zhanfeng

Study of High-Speed Pseudo-random Code Generator Whose Sampling Interval is Not 2i

This paper presents a new method for high-speed generation of pseudo-random code, which is based on sampling and parallel-to-serial conversion. This method can be used in situation that the sampling interval does not equal to , which increases the sampling selectivity and system adaptability. Finally, we verify the algorithm based on FPGA and the result is consistent with our prediction.

Novel Method for QDDFS with Super High Compression Ratio

A novel method for quadrature direct digital frequency synthesizer with ten millions compression ratio, which is based on the Taylor expansions of sine and cosine, is firstly put forward. The traditional DDFS architecture is changed while accumulator is replaced by phase tipster in this system. Through this excellent method, super high frequency resolution is achieved. At last, a simple configuration of this system is presented

Quadrature Direct Digital Frequency Synthesizer with High Compression Ratio

This paper presents a new QDDFS architecture with high compression ratio, which based on the principles of non-linear approach and trigonometric approximation. The principles have been analyzed systemically and all the parameters have been optimized. A high compression ratio of 762 at 93.5 dBc in a 16 bit system. The architecture is realized by Quartus-II at maximum clock frequency of 100 MHz. In the end, a proposed architecture is given.