obsidian-notes/射频/滤波器/预选滤波器.md
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---
title: 预选滤波器
updated: 2022-01-12 01:49:44Z
created: 2022-01-08 13:17:42Z
---
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
核心器件是==变容二极管==
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
![beb6680793e09578c69b3dd1a443b28c.png](../../../_resources/beb6680793e09578c69b3dd1a443b28c.png)
为减小调谐难度,滤波器宜采用对称结构,典型拓扑如图