调频发射机设计29587.doc

1 调频发射机设计摘要本文主要讨论了调频发射机的原理实现方式并设计了电路图,将调频发射机的电路分为了振荡器、缓冲隔离、功率激励、及末级功放几部分,分别讨论它们的原理及其特性。关键词: 调频发射,振荡器,高频功率放大器 Abstract This paper discusses the FM transmitter means for realizing the principles and design of the circuit diagram, FM transmitters to the oscillator circuit is divided into a buffer isolation, power motivation, and the end-PA several parts, They discussed the principles and characteristics. Key words :FM transmitters, oscillators, high-frequency power amplifier 2 第一节线性调频基本原理......................................................................................................... 3 第二节调频电路组成................................................................................................................... 4 振荡电路............................................................................................................................... 5 反馈振荡器的组成.................................................................................................. 5 振荡的建立与起振条件........................................................................................... 6 振荡的平衡和平衡条件.......................................................................................... 7 振荡平衡的稳定条件............................................................................................... 7 变容二极管调频法............................................................................................................... 8 二极管的电容效应................................................................................................... 8 变容二极管.............................................................................................................. 10 高频功率放大器................................................................................................................ 16 高频小信号放大器................................................................................................. 16 高频功率放大器....................................................................