Course Introduction

I. Course Nature and Teaching Purpose

High Frequency Communication Electronic Circuit is the main basic course for communication engineering, electronic information engineering, radio wave propagation and electronic science and technology majors. The purpose of this course is to master the basic concept, working principle and circuit composition of each unit circuit of high frequency communication electronic circuit through the study of common electronic components, analog circuits and system. Mastering various nonlinear electronic circuit analysis and design methods can lay a necessary foundation for follow-up courses such as engineering implementation of electronic system. The course emphasizes the integration of theory with practice and requires students to pay attention to cultivating the ability of combining theory with practice. In terms of experimental skills, students are required to skillfully master the usage and basic test technologies of common test instruments for high-frequency electronic circuits, and have the ability of preliminary design, installation and debugging of basic unit circuits of communication electronic circuits.

The course adopts the engineering approximation method as the basic analytical method of electronic circuits, and focuses on the basic units of functional circuits. From unit to system, from separation to integration, from basic principles to the realization of functional circuits, it emphasizes the connection and application between circuits.

II. Teaching Objectives

1.        Master the basic concept, working principle and circuit composition of each unit circuit in high-frequency communication electronic circuit;

2.        Master various nonlinear electronic circuit analysis and design methods;

3.        Master the usage and basic test technology of common test instruments for high-frequency communication electronic circuits.

III. Course Content

Chapter 1 is the introduction, which introduces the basic composition of electronic communication system and the basic principle of radio signal transmission.

Chapter 2 is the fundamentals of communication electronic circuit, which describes the basic characteristics of common components, resonant circuit and coupling circuit in communication electronic circuit.

Chapter 3 is about the high frequency small signal amplifier. The circuit model of transistor with Y parameter is discussed, and the performance of common emitter amplifier is analyzed from the point of view of linear circuit. At the same time, the broadband integrated circuit, multistage high frequency small signal amplifier and the noise in the amplifier are also described.

Chapter 4 is about the resonant power amplifier, which focuses on class C resonant power amplifier, discusses the basic principle, performance analysis and feed line of high frequency power amplifier.

Chapter 5 is about the sine wave oscillator, which mainly introduces the analysis of transformer coupled LC sine wave oscillator and three-terminal oscillator. RC oscillator, crystal oscillator and integrated circuit oscillator are also discussed.

Chapter 6 introduces the analysis methods of spectrum linear moving circuit, including power series analysis method, linear time-varying analysis circuit analysis method and switching function analysis method. The principle of spectrum moving circuit is analyzed, including single diode circuit, double diode balance circuit, single differential pair modulation circuit, double differential pair balance modulator and so on.

Chapter 7 is about amplitude modulation, demodulation and mixing circuit. This chapter uses the analysis method in Chapter 6 and the corresponding spectrum moving circuit to realize amplitude modulation, mixing and demodulation. The mixing circuit includes triode superposition mixing, diode balanced mixing and product mixing composed of integrated circuits. The demodulation of amplitude modulation signal focuses on diode peak envelope detection. At the same time, the principle and circuit of synchronous detection are also described.

Chapter 8 introduces the nonlinear transformation circuit of spectrum (angle modulation and demodulation). The modulation focuses on direct frequency modulation, and the phase modulation circuit is used as the means of indirect frequency modulation; The demodulation circuit of FM wave includes slope frequency discriminator, phase frequency discriminator and pulse counting frequency discriminator, mainly focusing on superposition phase frequency discriminator and product phase frequency discriminator.

Teaching Objectives

1.        Master the basic concept, working principle and circuit composition of each unit circuit in high-frequency communication electronic circuit;

2.        Master various nonlinear electronic circuit analysis and design methods;

3.        Master the usage and basic test technology of common test instruments for high-frequency communication electronic circuits.

Pre-knowledge

Leading Course

Advanced Mathematics, College Physics, Fundamentals of Circuit Analysis and Low Frequency Electronic Circuits

Reference Material

Textbooks

Edited by Jin Weizheng, and et al. High Frequency Electronic Circuits. Tsinghua University Press. First edition in August 2020, first printing in August 2020.

Book No.: ISBN 978-7-302-55218-5

Reference Books

[1] Zhang Suwen. High Frequency Electronic Circuits. Fifth edition. Beijing: Higher Education Press, 2013

[2] Feng Jun, Xie Jiakui, and et al. Electronic Circuits (Nonlinear Part). Fifth Edition. Beijing: Higher Education Press, 2010

[3] Zeng Xingwen, Liu Nai’an, and et al. Principle and Analysis of High Frequency Circuit. (Sixth Edition). Xi'an: Xi'an University of Electronic Science and Technology Press, 2017

[4] Gao Jixiang and Gao Guangzhu. High Frequency Electronic Circuits. Fourth Edition. Beijing: Electronic Industry Press, 2016

Common Questions

1. What leading courses are required for learning high frequency communication electronic circuits?

·          Advanced Mathematics, College Physics, Fundamentals of Circuit Analysis and Low Frequency Electronic Circuits

2. What are the characteristics of high frequency communication electronic circuits?

·          The working frequency of the circuits is high, the components are nonlinear and generate new frequencies, and there are many kinds of circuits.

3. What is the level of arrangement of the course content?

(1) First, it teaches the basic principle of realizing each function, and then derives the basic circuit;

(2) Then, the reasonable approximation is carried out to lead to the approximate engineering analysis of the circuit;

(3) Finally, according to the analysis results, the design principles of the circuit and the basic ways to improve the circuit performance are put forward.