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<title>石英晶体振荡器一</title>
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<p class=MsoNormal style='text-indent:20.65pt;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"'>石英晶体振荡器一</span><span lang=EN-US><o:p></o:p></span></b></p>
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mso-char-indent-size:10.5pt;mso-char-indent-size:10.5pt'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>这是最常用的一种石英晶体振荡电路，振荡频率就不用计算了，由石英晶体的谐振频率决定。改变</span><span
lang=EN-US>C1</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>、</span><span lang=EN-US>C2</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>能微调振荡频率。如果把石英晶体等效成</span><span lang=EN-US>LC</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>电路，这个振荡电路实际上就是电容三点式振荡电路。由此可知，电容</span><span lang=EN-US>C1</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>、</span><span lang=EN-US>C2</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>的作用是产生正反馈，对它们的选取没有严格要求，一般取</span><span
lang=EN-US>C1</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>＝</span><span lang=EN-US>C2</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，容量在几十皮到几百皮之间。电阻</span><span lang=EN-US>R</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>的作用是把非门变成一个反相放大器。它的阻值在</span><span lang=EN-US>1M</span><span
style='font-family:宋体'>Ω</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>以上。</span></p>
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