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。在小电流有佳蜂窝带动态范围,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 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
基于MAX2323/MAX2325 的芯片简介及应用电路设计......