文献综述

基于锁相环NE564的调频与鉴频电路的设计

摘要：

本设计主要为实现一种能够实现频率调制和解调的调频和鉴频电路。对当前的调制方法进行了比较和分析，确定了采用模拟调制法来实现调制解调电路。本设计以高频锁相环集成电路NE564为核心，增加合适的发射功放及接收滤波、解调放大电路，抛弃原来的纯分离元器件电路，从而把原始信号更好的还原出来。这种实现方法的优点是电路简单，性能更好，且实现了集成电路的优势。

关键词：调频；鉴频；锁相环；NE564

Abstract

This design mainly aims to realize a frequency modulation and frequency discrimination circuit to realize frequency modulation and demodulation. The modulation and demodulation circuit is realized by the analog modulation method by comparing and analyzing the current method. The design takes the high frequency phase-locked loop integrated circuit NE564 as the core, adding suitable transmitting power amplifier and receiving filtering, demodulating and amplifying circuit, and discards the original purely separated component circuit, thereby better recovering the original signal. The advantage of this implementation is that the circuit is simple with better performance, and the merits of the integrated circuit are realized.

Keywords: frequency modulation; frequency discrimination; phase-locked loop; NE564

1. 锁相环技术研究的背景和意义

“锁相环技术”是近年以来发展非常迅速的一项技术，其在许多新型的电子设备中，得到广泛的应用。并且随着通信技术的发展，锁相环技术在调制解调中也扮演着越来越重要的角色^[1]。