基于MAX2338芯片简介及应用电路设计

本文ID：1069

字数:8418.页数:21

字数:8418.页数:21

摘要：
MAX2338接收机射频前端芯片设计用于双频CDMA手机，也可以用于双频TDMA、GSM或者EDGE手机中。由于它采用片上低功耗本振LO分频，蜂窝电话中的压控振荡器VCO可以取消。它包括一个具有可调的高输入三阶交调点(IIP3)低噪声放大器(LNA)，用以减少当前大干扰信号下的互调失真和交调失真。在蜂窝波段工作时，低增益的LNA可以在更低的工作电流下获得更高的级联IIP3值。CDMA混频器是为高线性、低噪声和差分中频(IF)输出而设计的。MAX2338三模式低噪声放大器(LNA)/混频器包括一个片上本振（LO）频率分频器，可以使用单个压控振荡器（VCO）实现双频输出。另外，在应用信息部分给出了183.6MHz CDMA优化MAX2338混频器与IF SAW滤波器间的匹配电路。

Abstract：
The MAX2338 receiver RF front-end IC is designed for dual-band CDMA cellular phones and can also be used in dual-band TDMA, GSM, or EDGE cellular phones. Thanks to the it’s on-chip low-power LO divider, the cellular VCO module can be eliminated. The MAX2338 includes a low-noise amplifier (LNA) with an adjustable high-input third-order intercept point (IIP3) to minimize intermediation and cross-modulation in the presence of large interfering signals. For cellular band operation, a low-gain LNA is available for higher cascaded IIP3 at lower current. The CDMA mixers are designed for high linearity, low noise, and differential IF outputs. The MAX2338 triple-mode LNA/mixer includes an on- chip LO frequency divider to allow the use of a single VCO for both bands. In addition, 183. 6MHz CDMA circuit optimized the MAX2338 mixer and the matching circuit of IF SAW filter in the Application information.

关键字：低噪声放大器（LNA）三阶交调点(IIP3) 混频器高增益高线性（HGHL）
蜂窝频率

Keyword： Low-Noise Amplifier Third-order Intercept Point Mixer
High Gain High Linearity Cellular Band

摘要 ……………………………………………………………………………….2

1、总体描述…………………………………………………………………………3

2、性能特点…………………………………………………………………………3

3、应用领域…………………………………………………………………………3

4、命令信息…………………………………………………………………………3

5、绝对最大额定值…………………………………………………………………3

6、直流电气特性……………………………………………………………………4

7、交流电气特性……………………………………………………………………4

8、引脚结构与功能图表……………………………………………………………7
8．1引脚描述……………………………………………………………………………….8
9、典型工作特性图…………………………………………………………………9

10、详细说明………………………………………………………………………12
10．1低噪声放大器…………………………………………………………………………12
10．2下变频器………………………………………………………………………………12
10．3本振LO输出缓冲…………………………………………………………………….12
10．4本振LO分频器……………………………………………………………………….12
10．5工作模式………………………………………………………………………………13
11、应用信息………………………………………………………………………13
11．1级联低噪声放大器（LNA）/混频器性能……………………………………………13
11．2应用举例………………………………………………………………………………13
12、散射参数………………………………………………………………………16

13、电路设计注意事项……………………………………………………………18

14、典型应用电路…………………………………………………………………19

15、总结……………………………………………………………………………19

16、参考文献………………………………………………………………………20