Communication electronic circuit

This course mainly studies the working principles and composition of each unit of sending and receiving equipment in communication systems, as well as the working principles, typical circuits and analysis methods of various unit circuits that constitute sending and receiving equipment. It should be noted that in nonlinear electronic circuits, in order to achieve the same function, different circuit forms are used due to different index requirements. In addition, even if the circuit is of the same form, if its working status, input signal properties, level, output filter characteristics, etc. are different, the functions implemented will be different. Therefore, we must pay attention to mastering the basic principles of various functional circuits, the characteristics and applicable occasions of different circuits, and grasping the internal connections and commonalities of each functional circuit.

• Chapter 1：Communication system composition (35 minutes and 11 seconds)

• Chapter 2：Channels in wireless communication systems (45 minutes and 22 seconds)

• Chapter 3：Spectral representation of signals in communication systems (9 minutes and 58 seconds)

• Chapter 4：Digital and modern communication systems (25 minutes and 44 seconds)

• Chapter 5：Frequency Selective Network 1 (18 minutes and 20 seconds)

• Chapter 6：Frequency Selective Network 2 (44 minutes and 51 seconds)

• Chapter 7：Frequency Selective Network 3 (44 minutes and 57 seconds)

• Chapter 8：Frequency Selective Network 4 (44 minutes and 51 seconds)

• Chapter 9：Frequency Selective Network 5 (45 minutes and 17 seconds)

• Chapter 10：Frequency Selective Network 6 (45 minutes and 4 seconds)

• Chapter 11：Frequency Selective Network 7 (45 minutes and 4 seconds)

• Chapter 12：Frequency Selective Network 8 (45 minutes and 5 seconds)

• Chapter 13：Frequency Selective Network 9 (44 minutes and 20 seconds)

• Chapter 14：Basics of Nonlinear Circuit Analysis (45 minutes and 2 seconds)

• Chapter 15：Transistor high frequency small signal equivalent circuit and parameters 1 (44 minutes and 44 seconds)

• Chapter 16：Transistor high frequency small signal equivalent circuit and parameters 2 (43 minutes and 2 seconds)

• Chapter 17：Transistor Resonant Amplifier 1 (45 minutes and 5 seconds)

• Chapter 18：Transistor Resonant Amplifier 2 (43 minutes and 51 seconds)

• Chapter 19：Resonant Amplifier Stability (45 minutes and 20 seconds)

• Chapter 20：Resonant Power Amplifier Overview (28 minutes and 24 seconds)

• Chapter 21：Working principle of resonant power amplifier 1 (18 minutes and 23 seconds)

• Chapter 22：Working principle of resonant power amplifier 2 (40 minutes and 30 seconds)

• Chapter 23：Broken line approximation analysis method of transistor resonant power amplifier 1 (45 minutes and 55 seconds)

• Chapter 24：Broken line approximation analysis method of transistor resonant power amplifier 2 (44 minutes and 24 seconds)

• Chapter 25：Broken line approximation analysis method of transistor resonant power amplifier 3 (49 minutes and 4 seconds)

• Chapter 26：Resonant power amplifier circuit 1 (41 minutes and 56 seconds)

• Chapter 27：Resonant power amplifier circuit 2 (44 minutes and 45 seconds)

• Chapter 28：Resonant power amplifier example (22 minutes and 42 seconds)

• Chapter 29：transistor frequency multiplier (22 minutes and 16 seconds)

• Chapter 30：Sine Wave Oscillator Overview (45 minutes and 4 seconds)

• Chapter 31：Basic working principle of feedback oscillator (45 minutes and 16 seconds)

• Chapter 32：Feedback type LC oscillator circuit 1 (45 minutes and 29 seconds)

• Chapter 33：Feedback type LC oscillator circuit 2 (45 minutes and 12 seconds)

• Chapter 34：Oscillator frequency stability problem (45 minutes and 50 seconds)

• Chapter 35：quartz crystal oscillator (30 minutes and 19 seconds)

• Chapter 36：Characteristics of spectrum shifting circuits (13 minutes and 12 seconds)

• Chapter 37：Amplitude modulation principle 1 (32 minutes and 4 seconds)

• Chapter 38：Amplitude modulation principle 2 (44 minutes and 31 seconds)

• Chapter 39：Amplitude modulation method and circuit 1 (44 minutes and 40 seconds)

• Chapter 40：Amplitude modulation method and circuit 2 (44 minutes and 4 seconds)

• Chapter 41：Amplitude modulation method and circuit 3 (15 minutes and 52 seconds)

• Chapter 42：Detection principle and circuit 1 (18 minutes and 38 seconds)

• Chapter 43：Detection principle and circuit 2 (44 minutes and 56 seconds)

• Chapter 44：Detection principle and circuit 3 (42 minutes and 50 seconds)

• Chapter 45：Detection principle and circuit 4 (14 minutes and 6 seconds)

• Chapter 46：Mixer principle and circuit 1 (30 minutes and 4 seconds)

• Chapter 47：Mixer principle and circuit 2 (45 minutes and 9 seconds)

• Chapter 48：Mixer principle and circuit 3 (42 minutes and 20 seconds)

• Chapter 49：Mixer principle and circuit 4 (45 minutes and 22 seconds)

• Chapter 50：Mixer principle and circuit 5 (46 minutes and 19 seconds)

• Chapter 51：Overview of Angle Modulation and Demodulation (23 minutes and 21 seconds)

• Chapter 52：Properties of angle-modulated waves 1 (38 minutes and 15 seconds)

• Chapter 53：Properties of angle-modulated waves 2 (31 minutes and 27 seconds)

• Chapter 54：Properties of angle-modulated waves 3 (42 minutes and 5 seconds)

• Chapter 55：Frequency modulation method and circuit 1 (44 minutes and 5 seconds)

• Chapter 56：Frequency modulation method and circuit 2 (38 minutes and 43 seconds)

• Chapter 57：Angle signal demodulation 1 (47 minutes and 39 seconds)

• Chapter 58：Angle signal demodulation 2 (57 minutes and 2 seconds)

• Chapter 59：Anti-interference (noise) performance of FM system (29 minutes and 57 seconds)

• Chapter 60：Communication electronic circuit experiment (42 minutes and 50 seconds)