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<title>RC正弦波振荡电路（文氏电桥振荡器）</title>
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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>正弦波振荡电路（文氏电桥振荡器）</span></b><span lang=EN-US><o:p></o:p></span></p>
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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>这个电路由</span><span lang=EN-US>RC</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>串并网络构成选频网络，同时兼作正反馈电路以产生振荡，两个电阻和电容的数值各自相等。负反馈电路中有两个二极管，它们的作用是稳定输出信号的幅度。也可以采用其他的非线形元件来自动调节反馈的强度，以稳定振幅，如：热敏电阻、场效应管等。</span><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:20.6pt;mso-char-indent-count:2.0;
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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>该电路输出波形较好，缺点是频率调节比较困难。</span><span lang=EN-US><o:p></o:p></span></p>
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