摘要本课题设计了L波段射频压控振荡器电路，用电压来控制振荡器的频率，采用变容二极管代替振荡回路中的振荡电容，通过改变加在变容二极管两端的反向偏压来改变管子的结电容，从而改变电路的振荡频率。本系统主要由单片机控制系统、数字锁相环路、功率放大电路、峰值检测电路等构成。利用ADS软件对压控振荡器进行了仿真设计，使压控振荡器工作在2GHz左右，频率可调范围100MHz，完成了相关有源器件选择、可变电容VC特性曲线的仿真，进行了压控振荡器相位噪声和振荡频率线性度分析，熟悉了射频电子线路的设计原理，进行了部分相关电路与软件设计，最后画出了该振荡器的电路原理图和PCB图。68453

毕业论文关键词  压控振荡器  频率  ADS  射频电子线路

毕业设计说明书（论文）外文摘要

Title    Design of L Band Radio Frequency VCO                    

Abstract

This paper designed L-band RF VCO circuit, using voltage to controlled oscillator frequency and instead of varactor capacitance oscillator circuit oscillations by changing the applied varactor reverse bias voltage across the diode to change the tube junction capacitance, thereby changing the oscillation frequency of the circuit. The system consists of the microcomputer control system, digital phase-locked loop, power amplifier circuit and the peak detection circuit. The author conducted the simulation design of voltage controlled oscillators using ADS software, making the VCO works around 2GHz, and adjustable frequency range is range of 100MHz. Using ADS software the author completed the selection of the active devices, the simulation of the characteristic curve about variable capacitor VC, and analyzed phase noise and oscillation frequency linearity of the VCO. The author has been familiar with the design principle of radio frequency circuits, and designed part of the related circuit and software，finally drew the schematic diagram and PCB diagram of the oscillator circuit.

Keywords voltage controlled oscillator  frequency  ADS  RF electronic circuits

目   次

1 引言 1

1.1 选题目的和意义 1

1.2 国内外研究现状 1

1.3 设计内容 2

1.4 整体框图 2

2 压控振荡器 3

2.1 压控振荡器原理 3

2.2 压控振荡器起振条件 5

2.3 压控振荡器分类 5

2.4 压控振荡器的数学模型 6

2.5 压控振荡器的设计指标 7

2.6 压控振荡器相位噪声分析 8

2.7 压控振荡器的应用 9

3 ADS软件介绍 10

4 压控振荡器的ADS软件仿真与分析 11

4.1 偏置电路的设计 11

4.2 可变电容VC特性曲线测试 12

4.3 压控振荡器的设计 14

4.4 压控振荡器相位噪声分析