分析数字控制的文氏桥振荡器

摘要：对所有的低频振荡器配置，维恩桥是最容易使用的。它是可靠的，使用标准组件，提供了一个很好的正弦波，并围绕它设计的运算放大器的类型是相当免疫。然而，文氏桥被误解和过于简单，导致设计师挫折。本文介绍的理论和实际使用维恩电桥振荡器，以及如何使电路更稳定和更factory-/user-flexible 。

Maxim > App Notes > DIGITAL POTENTIOMETERS

Keywords: Wien Bridge , Digital Potentiometer, digital pot, oscillator May 24, 2006

APPLICATION NOTE 3846
Analysis of a Digitally Controlled Wien-Bridge Oscillator

Abstract: Of all the low-frequency oscillator configurations, the Wien bridge is the easiest to use. It is reliable,
uses standard components, gives a good sine wave, and is fairly immune to the type of op amp around which it
is designed. A Wien bridge can, however, be misunderstood and oversimplified, leading to designer frustration.
This article describes the theory and practicalities of using a Wien-bridge oscillator, and how to make the circuit
more stable and more factory-/user-flexible.


The Wien-Bridge Circuit

The circuit of a standard Wien-br