13 lines
547 B
Markdown
13 lines
547 B
Markdown
---
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title: 预选滤波器
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updated: 2022-01-12 01:49:44Z
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created: 2022-01-08 13:17:42Z
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---
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窄带模式在低频30-300M时可采用LC电调形式,因为LC电调滤波器的带宽会随c变化而变化,频率越低带宽越窄
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核心器件是==变容二极管==
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容易采购到的型号为BB640E6327HTSA1(即将停产,替换型号在寻),特性如下 VR≤28V
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![beb6680793e09578c69b3dd1a443b28c.png](../../../_resources/beb6680793e09578c69b3dd1a443b28c.png)
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为减小调谐难度,滤波器宜采用对称结构,典型拓扑如图 |