科技
分享：射频专业面试相关问题以及答案
SERENA
2021-09-14
论坛网友liang_20120830整理了一些大家面试射频工程师时可能会被问到的问题，并给出了解答，希望有所帮助。
问题列表：
1.你做过什么项目？画出原理图，讲述各个器件的意义，描述信号的传输等等。（这个基本每家单位都会问）...
2.画出二端口网络S矩阵框图，并说明每个参数的意义。...
3. dBi与dBd什么区别？dB与dBm什么关系，dBm与电压怎么换算的？没啥说的。...
4.画出smith圆图，指出开路点、短路点、匹配点，并说明阻抗原图与导纳圆图的关系。...
5.一个负载阻抗并联一个电感或电容，怎么在smith圆图求出其输入阻抗？...
6.微带线特性阻抗与哪些因素有关？与线长L有关吗？...
7.写出传输线输入阻抗的表达式，并说明同一传输线上不同两点反射系数的关系。...
8.请画出3dB威尔金森功分器原理图。...
9.请写出单级放大器噪声系数的表达式，多级放大器级联NF又如何？...
10.放大器的增益有哪几种？有什么区别和联系？...
11.放大器绝对稳定的条件是什么？请写出表达式。...
12.请问低噪声放大器输入端和输出端匹配原则是什么？阻抗匹配的目的是什么？...
13.低噪声放大器中高频扼流圈的作用是什么？...
14.低噪声放大器的主要性能指标有哪些？...
15.功率放大器的1dB压缩点怎么定义的？IIP3又是指什么？有何意义？...
16.功率放大器有哪几种工作状态？各有什么区别？...
17.请画出一般接收机的系统框图，并说明各个模块的用处。...
18.天线的性能指标有哪些？...
19.天线的极化方式有哪些？请画出半波对称阵子的方向图。...
20.你会使用的微波软件有哪些？测量仪器有哪些？熟练程度如何？...
21.简述抽样定理...
22.频谱仪中的RBW成为分辨率带宽，请解释其定义。...
23.简要说明香农公式。...
24.简述移动通信中的慢衰落含义。...
25.在阻抗圆图上，从源向负载方向移动和从负载向源方向移动，该如何转源图？...
26.在阻抗圆图中，圆图旋转一周，代表多少波长？...
27.天线是无源器件为何有增益？天线的增益和放大器的增益有何不同？...
28.3dB 电桥的两个输出端相位差是多少？...
29.威尔金森功分器，两个输出端口之间为何要加一电阻？不加行不行？...
30.在天线工程中，常把线极化天线分为水平极化和垂直极化，何为水平极化和垂直极化？...
31.常用的射频滤波器有那些？有那些参数？...
32. 隔离器和环行器的作用是什么？...
33. 用微带平行耦合线做的耦器，要使他具有最佳定向性，耦合线长度应为多长？在用微带平行耦合线做的定向耦合器中，信号的传输方向与耦合信号的传输方向有什么关系？...
34. 请说出锁相环电路的基本构成（PLL）。...
35. 什么是相位噪声，相位噪声的单位是什么？...
36. 在锁相环电路中，鉴相频率相同的情况下，随着分频比N的增加，PLL的噪底如何变化？...
37 产品开发流程...
38.数字调制射频信号的峰均比的定义PAR
下载解答：
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