基于正交解调芯片TDA8040T的Costas环设计

Design of the Costas loop based on quadrature demodulator chip TDA8040T

介绍了一种基于正交解调芯片TDA8040T的Costas环的模拟电路设计方法,对调试过程中出现的一些问题进行了分析说明,提出了解决方案,并给出了在载波为70MHz条件下的实验,结果表明,由正交解调芯片TDA8040T构成的Costas环具有很好的特性,可用于适宜频率的二相或四相相移键控(BPSK或QPSK)的解调电路。

This paper discussed the design of the Costas loop analogical circuit based on TDA8040T, analyzed the problems during the debugging process and gave the solution. At last, the experiment results under 70 MHz carrier was shown. The results indicated the design of the Costas based on TDA8040T had good characteristic. It can be used in the BPSK or QPSK demodulating circuits at proper frequency.