【经验】思瑞浦TPW3157N负压模拟开关芯片用于室外大功率基站系统的开发经验分享
伴随着目前电子行业的飞速发展,为了更好的设计室外大功率基站系统,现在不少人选用思瑞浦的TPW3157N负压模拟开关芯片进行设计。本文我们针对TPW3157N设计情况做下简单分析,希望对大家能有所帮助。
首先,TPW3157N内部框图和引脚图如下所示,从框图内部可知:TPW3157N内部集成自带基准比较器用于内部开关直接驱动切换,TPW3157N包含单刀双掷(SPDT)开关,可以通过模拟和数字负电压,开关之间保证导通电阻平坦度超过信号范围。这确保了良好的线性和切换控制信号时失真低,大大提高系统级别稳定性。
由于模拟开关电路结构都比较简单单一,工程师一般都是拿手就用,但是还是有一些细节末支需要设计研发时留意:
1、6脚输入电压,TPW3157N最大只能到3.3V,极限4V,不能用在5V系统上;
2、6脚输入只要高低两种状态,不可以浮空,所以有些特点场合不适用;
3、VEE电压越高,导通阻抗越小。
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