2DPSK数字调制器的研究与设计毕业论文

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1、 2DPSK 数字调制器的研究与设计 The Research and Design of 2DPSK Digital Modulator I 摘摘 要要 数字相位调制广泛应用于通信领域。2DPSK 是一种基本的相移键控。PSK 调制通 常有两种实现方法：乘法器法和相位选择法。本文采用相位选择法实现 PSK 调制。 文章首先介绍了两种实现方法的电路框图。接着论述了相位选择法实现 2DPSK 调制 的各部分电路设计。相位选择开关采用了集成芯片 74HC4051，这种模拟开关可通过 三位数字信号的控制从 8 路模拟信号中选通其中的一路输出。本文中只用了二选一 开关。用一位数字信号的高低电平选 出其

2、中的一路信号，即选出初始相位为 0或 180的载波。从而实现了 2DPSK 的调制。文中还详细介绍了其他单元电路的设计， 包括低通滤波电路，载波放大和形成电路，以及调制输出电路。论文最后完成了用 Protel 设计的总体电原理图。 关键词：数字通信 数字调制 相移键控 相对相移键控 II Abstract Digital phase modulation is widely used in the field of communication.2DPSK is a kind of basic phase shift keying.PSK usually have two ways to rea

3、lize the modulation:multiplier method and the phase selection method.The phase selection method is adopted to realize PSK modulation in this paper.Two methods are introduced to realize circuit diagram first.Then discussesed design of circuit that is the phase selection method to realize 2DPSK modula

4、tion.The integrated chip 74HC4051 is adopted as the phase selection switch which can be controlled by 3bit digital signals so that a channel signal is selected from eight analog signnals.One of two switch is only used for this paper .High and low level of a digital signal are used to choose one of the signals, that selectes the initial carrier phase that is 0 degrees or 180 degrees.In order to the modulation of 2DPSK modulation is achieved.And the design of the other circuit unit are int