The Principle of QPSK is introduced, Vector figure of QPSK and Logic coding table are given, parameters of semiconductor chip TDA8050A of PHILIPS company are described mainly.

• 介绍QPSK原理 ,给出QPSK矢量图和逻辑编码表 ,重点概述PHILIPS公司半导体芯片TDA80 5 0A的参数