一种新型delta-sigma小数分频器的FPGA实现

FPGA realization of a new type of delta-sigma dicimal frequency divider

小数分频技术能够有效地解决小数分频比与频率分辨率之间的矛盾,只需改变某位小数,就可以在不降低参考频率的情况下提高频率分辨率。但小数分频存在小数杂波的问题,利用delta-sigma小数分频技术,既能够保证输出信号的高频率分辨率,又能够抑制小数分频产生的杂波,提高频谱纯度。

The fractional frequency technology can effectively solve contradiction between the fractional divider and the frequency resolution, it just needs to change a certain decimal, which can improve the frequency resolution without reducing the reference frequency. However, the fractional frequency has clutter. By using the delta-sigma decimal fractional frequency technology, it can not only ensure the output signal of the high-frequency resolution, but also be able to inhibit the fractional frequency clutter and improve the spectral purity.