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1、2011年全国大学生电子设计竞赛LC 谐振放大器（D 题）【本科组】I 摘要本次设计是以谐振放大器为核心，以实现微小高频信号不失真放大而进行的。本次设计针对的是小于5mV 的 15MHZ 的信号，因此对于信号纯度的要求很高，因此我们选择制作PCB 板和滤波电容来进行滤波以保证我们所处理的波是干净的少杂波的。而谐振放大器一般应用于小信号放大。为了进行微小信号的处理，需在设计前加一个衰减器，设计所用的衰减器是 形电阻网络，这种衰减网络可以有效保输入阻抗不变，并且电路简单易于实行，衰减倍数在40dB 左右，然后经过差分电路进行选频放大，由于信号放大倍数不够，因此又在后级加了以AD603 为核心的放大
2、电路进行放大。设计完成以后，可以完成设计所要求基本的指标以及大部分发挥部分的指标。关键词：LC 谐振，放大，衰减，高频文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T
3、5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9
4、O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A
5、4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N
6、5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:C
7、X9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ
8、9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4II 目录第一章系统方案论证.11.1 衰减器的论证与选择.11.2 LC 谐振放大器的论证与选择.11.3 AGC 的论证与选择.11.3 控制
9、系统的论证与选择.2第二章系统理论分析与计算.22.1 衰减器的理论分析与计算.22.1.1 理论计算.22.1.2 特性阻抗的理论计算.22.1.3 频带的理论计算.22.2 谐振放大器的理论计算与分析.22.2.1 谐振放大器.22.2.2 计算分析.32.3 AGC 的理论计算与分析.32.3.1 AGC的计算.3第三章电路与程序设计.33.1 电路的设计.33.1.1 系统总体框图.43.1.2LC 谐振子系统框图与电路原理图.43.1.3 电源.4第四章测试方案与测试结果.54.1 测试方案.54.2 测试条件与仪器.64.3 测试结果及分析.64.3.1 测试结果(数据).64.3
10、.2 测试分析与结论.7文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文
11、档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1
12、Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B
13、10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R
14、4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8
15、X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U
16、2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R41 第一章 系统方案论证本系统主要由衰减模块、谐振放大模块、AGC 模块、电源模块组成，下面分别论证这几个模块的选择。1.1 衰减器的论证与选择方案一：采用程控衰减器，与msp430f449实现单片联调控制系统。为了达到更好的效果，还需要考
17、虑温度补偿等因素；由于本系统主要重点在谐振电路的设计，对衰减器的要求不高，不需要对衰减器实现程控，并且线路一多会对高频信号产生影响，故本方案不适于施行。方案二：使用运算放大器进行反相衰减，用运放的放大原理，改变反馈电阻与输入电阻的比值来达到衰减的目的。可是运放有很大的不稳定因素，一者是输入信号为高频小信号，普通运放并不能很好的放大这样的信号；二者是运放十分容易失真，为实验增加了不稳定因素，因此并不适合我们。方案三：除去复杂的衰减电路，返朴归真，有一种从一开始就被使用的衰减网络：电阻衰减网络。本报告中主要用 形电阻网络进行一定程度的衰减。由于此衰减器简单易行，所用元器件比较常用，能保持输入阻抗不
18、变，并且的是本衰减器为纯阻网络，即此衰减器的频带为任意频率均可通，实现全通，能够很好地与下级谐振放大器相结合。综上，选择方案三。1.2 LC 谐振放大器的论证与选择方案一：谐振放大器广泛用于通信接受系统中，由于信号的远距离传输，会导致信号变得很微弱，因此需要将信号放大方可被系统接收到；可以使用集成芯片通过一些简单的外围电路的搭接就可以制成各种谐振放大器，但往往其造价过高，并且参数难以调节，并不适合本设计要求。方案二：采用差分电路构成LC 谐振电路进行滤波选频，后接射级电压跟随电路，用独立元件布线而成，此种方法可以自己控制元器件的选择搭配，调节参数时比较方便，易于达到我们所要的效果，并且造价不高
19、，适于我们使用。综上，选择方案二。1.3 AGC 的论证与选择方案一：利用集成芯片 AD603 这样一款压控增益芯片，该芯片通过改变电压差来实文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7
20、U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5
21、M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O
22、8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4
23、K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5
24、T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX
25、9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R42 现增益控制，并且此芯片是一款程控芯片，并且芯片只需要搭一些简单的外围电路即可使用，且性能优良，放大效果好，也适于高频放
26、大使用方案二：利用可编程数字电位器，输入信号经过乘法运算电路，再进行一定的放大，放大到合理的程度，整流滤波后经过一比较放大电路，反馈到输入源；改变电阻的大小，即可改变放大的倍数，从而达到增益自动控制的目的。综上，采用方案一。1.3 控制系统的论证与选择方案一：用简单的硬件电路实现控制，有利用调节电位器，开关的通断等等来调节电路的，这种方法可以很容易检查出电路出错的地方，并且也有感官上的认识，简单易行；但比较传统，操作复杂，最重要的是这种方法并不人性化，在信息化高速发展的今天，这种方法并不适用。方案二：利用 msp430f449这款 MCU（微控制器）与硬件电路联调实现自动化的控制，方便简洁，并
27、且人性化。综上，采用方案二。第二章系统理论分析与计算2.1 衰减器的理论分析与计算2.1.1理论计算设输入电压为 Ui，输出电压为 Uo,从电路图分析可以看出衰减系数为Uo=Ui*RL/(RL+R2)1 通过改变相应的系数即可实现衰减系数可调的衰减器；由于衰减系数需要为40dB，即为 100 倍，我们选用的电阻在误差允许范围内满足(RL+R2)/RL 为 100，符合题目要求。2.1.2特性阻抗的理论计算衰减网络的特性阻抗即为整个衰减网络的输出阻抗，从衰减网络我们可以很容易得看出Ro=Rl/(Rl+R2)2 加上传输同轴电缆，所以此时整个衰减网络的特性阻抗变为同轴电缆的特性阻抗，即为 50，符
28、合题目要求。2.1.3频带的理论计算由于本衰减网络为纯电阻网络，无论对于任何频率的信号，所起的衰减作用都是同样的，没有频宽的意义，即为通频。频带一定与下级相适应。2.2 谐振放大器的理论计算与分析2.2.1 谐振放大器本谐振放大器采用LC 发生谐振，从下面的谐振电路multisim 仿真图可以看文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10
29、 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文
30、档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1
31、Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B
32、10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R
33、4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8
34、X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U
35、2B10 ZB5N5T5M7R43 出，采用了长尾式电路，L 与 C 相互并联，构成并联谐振，整个电路在仿真器上实验通过，性能优良，Q 值较高。2.2.2计算分析1 发生谐振时的频率f=1/(2(LC)1/2)3 通过理论计算得出 f=15MHz 左右,误差允许范围内满足题目要求。2 增益的理论计算Au=20log(Uo/Ui)4 3 输入电阻的计算Rin=Ui/Ii 5 经过分析计算，得出Rin=50。4 在-3dB 带宽内做出一条直线，得出近似的2 f0.7 值带内波动为 1dB。2.3 AGC 的理论计算与分析2.3.1 AGC 的计算AGC 的计算比较简单，主要是用了一款比较方便的芯片
36、AD603，其增益与该芯片 1 脚与二脚的差呈线性关系（以dB 来计算），将其 5，7 脚短接，放大关系为(40Vg+10)dB 这样就为理论分析与实际应用提供了方便，在误差允许的范围内，差值与增益值基本上成线性关系，不存在大的误差,但需注意 1，2 脚电压差不能超过正负 0.5V。第三章电路与程序设计3.1 电路的设计图 1 衰减器电路图图 2 LC 谐振电路图 3 AD603 后级放大模块文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9
37、A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5
38、N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:
39、CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 H
40、J9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 Z
41、B5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编
42、码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7
43、 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R44 3.1.1系统总体框图系统总体框图如图1 所示，系统总体框图3.1.2LC 谐振子系统框图与电路原理图LC 谐振子系统框图3.1.3电源电源由变压部分、滤波部分、稳压部分组成。为整个系统提供3.6V 电压，确保电路的正常稳定工作。这部分电路比较简单，采用LM337，LM317 实现可变直流电压源，故不作详述。3.2 程序的设计3.2.1程序功能描述与设计思路1、程序功能描述根据题目要求软件部分主要实现键盘的设置和显示。1）键盘实现功能：设置电压值2）显示部分：
44、显示电压值2、程序设计思路由于 AD603 是可控增益的运放芯片，所以它与tlv5618 这一 DA 转换控制芯片相连可以实现控制电压进而控制放大增益的效果，而用键盘上的两个键，以0.1V 为步进来控制电压增减。图 5.LC 谐振子系统流程经 衰 减 器 衰减后的信号经差分电路来进行滤波选频利 用 高 频 三 极 管3356 进行电压跟随放大后的信号输出，放大约 20dB AD603 的后级放大电路，进一步放大信号5mV 以下的 15MHZ以 上 的微 小高 频 信号形电阻网络衰减器，衰减在 40dB 以上LC 谐振放大电路将前 级 微 小 信 号 放 大29dB 左右以 tlv5618DA转
45、换实现电压控制增益最终输出在原信号基础上放大 60dB 以上的信号图 4.系统流程文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X
46、1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2
47、B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7
48、R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T
49、8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7
50、U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5M7R4文档编码:CX9O8T8X1Z7 HJ9A4K7U2B10 ZB5N5T5