基于MAX9994的芯片简介及应用电路设计

字数:4647.页数:24

摘要

简要介绍MAX9994混频器的功能、内部结构、运行特性、引脚排列及典型的应用电路。它是SiGe高线性度、1700MHz至2200MHz下变频混频器，带有LO缓冲器/开关. MAX9994是具有高线性度的下变频混频器，为1700MHz至2200MHz UMTS/WCDMA、DCS与PCS基站接收器提供8.3dB增益、+26dBm IIP3和9.7dB NF。除了提供出色的线性度和噪声性能，MAX9994还可以获得更高的元件集成度。MAX9994采用紧凑的、带裸露焊盘的20引脚、薄型QFN封装(5mm x 5mm)。在-40°C至+85°C扩展温度范围内可以确保电气性能。

关键字： 混频器  射频

  本地震荡   高线形

Abstract

It briefly introduced TheMAX9994 Mix microcontroller function, internal structure,typical operating characteristics, pin array and typical apply circuit. SiGeHigh-Linearity,1700MHz to 2200MHzDownconversion Mixer with LO Buffer/Switch. The MAX9994 high-linearity downconversion mixer provides8.3dB gain, +26.2dBm IIP3, and 9.7dB NF for1700MHz to 2200MHz UMTS/WCDMA, DCS, and PCSbase-station receiver applications. In addition to offering excellent linearity and noise performance,the MAX9994 also yields a high level of componentintegration. The MAX9994 is available in a compact,20-pin,thinQFNpackage (5mm x 5mm) with an exposed paddle.Electrical performance is guaranteed over the extended-40°C to +85°C temperature range.

Key word:mix  RF

         LO    High-linearity

目 录

1.MAX9994芯片简介...................................................................4

2.MAX9994芯片封装与引脚功能.........................................................6

   2.1 引脚功能描述.................................................................6

   2.2 芯片封装.....................................................................7

   2.3 参考系数.....................................................................8

   2.4 直流电气特性.................................................................8

   2.5 交流电气特性.................................................................9

3.MAX9994内部结构与工作原理  ......................................................10

3.1 典型运行特性...................................................................11

3.2 详细描述.......................................................................20

3.3 射频输入和不平衡变压器.........................................................20

3.4 低输入,缓冲器和不平衡变压器....................................................20

3.5 高线形混频器...................................................................21

3.6 差动输出IF放大器...............................................................21

4. MAX9994的应用信息...............................................................21

4.1输入和输出设备..................................................................21

4.2 电阻性质.......................................................................21

4.3 LEXT 感应器....................................................................21

4.4设计考虑........................................................................21

4.5电源电路........................................................................21

4.6暴露的RF引脚和热量的考虑........................................................22

4.7 封装信息.......................................................................22
5. 总结............................................................................23

参考文献...........................................................................23