DIGITAL NOISE-SHAPING FILTER WITH REAL COEFFICIENTS AND METHOD FOR MAKING THE SAME
摘要
A digital noise-shaping filter with real coefficients for delta-sigma data converters used in a digital amplifier, 1-bit digital/analog converter, 1-bit analog/digital converter and the like, and a method for making the same. The present digital noise-shaping filter has improved noise suppression performance and system stability and reduced calculation complexity. To this end, the digital noise-shaping filter comprises a noise transfer function expressed by <i>NTF(z)</i> = -1+<i>a1z<-1>+a2z<-2> + LAMBDA + aNz<-N></i>. The noise transfer function has optimum real coefficients or real coefficients approximating them.
