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发表于 2006-2-13 14:51:00
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<DIV class=O v:shape="_x0000_s1026"><DIV justify; mso-line-spacing: '100 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><FONT face=隶书><FONT size=7><P inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify; mso-pagination: widow-orphan">按功能分,有低通滤波器,高通滤波器,带通滤波器,带阻滤波器,可调滤波器。 <p></p></P><P inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify; mso-pagination: widow-orphan"> <p></p></P><P inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify; mso-pagination: widow-orphan">按用的元件分,有集总参数滤波器,分布参数滤波器,无源滤波器,有源滤波器,晶体滤波器,声表面波滤波器,等等</P><P inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify; mso-pagination: widow-orphan">一般可以用于滤除杂波信号,如果用于接收信号,则放在AMP的前面;若用于发送设备里面,则要放于AMP后面,以达到只发送或接收你需要的信号.</P><P inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify; mso-pagination: widow-orphan">其实以前也有人发过一些基础讲解,你不妨找找看.</P></FONT></FONT></DIV></DIV> |
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