基于MAX2323/MAX2325 的芯片简介及应用电路设计

字数：8764，页数27

摘要
简要介绍芯片MAX2323/MAX2325三频/双模CDMA低噪声放大器/混频器的功能、内部结构、引脚排列及典型的应用电路。MAX2323/MAX2325是低噪声放大器（LNA）加混频器电路，用于玛分多址（CDMA）在蜂窝频带和PCS频带。MAX2323地址定为双频带三模CDMA应用，提供开关信号电路用于蜂窝FM、蜂窝CDMA和PCS CDMA。MAX2325是蜂窝带双模型式。在最小电流有最佳蜂窝带动态范围，MAX2323/MAX2325有4个LNA态：高增益/高线性、高增益/低线性、中增益和低增益。CDMA混频器设计具有高线性，低噪声和差动IF输出：FM混频器则设计成低电流、单端输出。MAX2323/MAX2325还可以用于TDMA（时分多路复接）、EDGE和W-CDMA。
            
关键字：   三频/双模    低噪声放大器/混频器     玛分多址
                   蜂窝         PCS

Abstract
It briefly introduced The MAX2323/MAX2325 of Triple/Dual-ModeCDMA LNA/Mixers function，internal structure, pin array and typical apply circuit. The MAX2323/MAX2325 are low-noise amplifier (LNA) plus mixer ICs optimized for code-division multiple-access (CDMA) applications in both cellular and PCS bands. The MAX2323 addresses dual-band, triple-mode CDMA applications
By providing switched signal paths for cellular FM, cellular CDMA, and PCS CDMA. The MAX2325 is a cellular-band dual-mode version. To optimize cellular-band dynamic range at minimum current,
the MAX2323/MAX2325 implement four LNA states: high gain/high linearity, high gain/low linearity, midgain, and low gain. In high-gain/high-linearity mode, The CDMA mixers are designed for high linearity, low noise, and differential IF outputs；while the FM mixer is designed for lower current and single-ended output. The MAX2323/MAX2325 can also be used in TDMA, EDGE, and W-CDMA phones.

Key word:  Triple/Dual-Mode          LNA/Mixers           CDMA
              Cellular                  PCS

目 录

MAX2323/MAX2325芯片简介............................................................4
1.1  芯片简介......................................................................5
1.2  关键特性......................................................................5
1.3  最大绝对额定值................................................................5
2. MAX2323/MAX2325芯片封装与引脚功能...............................................5
3. MAX2323/MAX2325内部结构与工作原理...............................................8
3.1 MAX2323/MAX2325内部结构........................................................8
   3.1.1低噪声放大器（LNA..........................................................9
3.1.2混频器.......................................................................10
3.1.3  MAX2323芯片电气特性........................................................11
3.2  工作原理.....................................................................14
4. MAX2323/MAX2325应用电路设计....................................................19
4.1 利用MAX2323设计接收机前端.....................................................19
4.1.1接收机射频单元设计的基本步骤.................................................19
4.2 工作在通用210MHz IF的双频双模FE IC............................................21
4.3 MAX2323测试样板设计...........................................................22
5. 总结...........................................................................26
参考文献..........................................................................26