摘要： 这种电路派生纯正弦波从晶体控制时钟源所使用的环形计数器来删除最高振幅有害的谐波，和过滤结果与 8 阶低通、 开关电容椭圆筛选器 （MAX7400）。 Maxim > App Notes > Filter Circuits (Analog) Signal Generation Circuits
Keywords: sinewave generators, low-distortion signal generators, crystal-stabilized oscillators, ring counters, weighted-resistance Dec 21, 2010
networks, lowpass elliptic filters, switched-capacitor filters
APPLICATION NOTE 4547
Low-Cost Circuit Converts Clock to Low-Distortion Sinewave
Abstract:This circuit derives a pure sinewave from a crystal-controlled clock source by using a ring counter to remove the
highest-amplitude unwanted harmonics, and filtering the result with an 8th-order lowpass, switched-capacitor elliptic filter
(MAX7400).
A similar version of this article appeared in the October 2007 issue of PD magazine.
A simple, low-cost circuit ( Figure 1) uses the existing clock in a d……
