LC移相电路在调频和鉴频中的应用与仿真

Application and simulation of LC phase shifting circuit in frequency modulation and discrimination

由LC回路构成的移相电路具有调节输入输出信号之间的相位关系的作用,在通信电路中有广泛的应用。为深入研究LC移相电路的应用原理,论文推导了LC移相电路的传递函数,分析相移与电路参数的关系,讨论移相电路在间接调频和正交鉴频电路中的作用。利用Multisim仿真软件分别对调频和鉴频电路进行了仿真实验并验证理论分析结果,在通信电路课程学习中有助于学生加深对这部分知识的理解和掌握,提高应用能力。

LC phase shifting circuit can adjust phase shifting between input signal and output signal. It is widely used in communication circuit. In this paper, further research is done on principle of LC phase shifting circuit. Transfer function of LC phase shifting circuit is derived, and the relational expressions between phase shifting and some coefficients are analyzed. Then the applications of LC phase shifting circuit in indirect frequency modulation and quadrature discrimination are discussed, respectively. Multisim software is used for the circuit simulation of frequency modulation and discrimination , and the results of theoretical analysis are verified. It can help the students deepen the understanding of this part of knowledge in the communication circuit course and improve the application abilities.