Design and practice of high frequency electronic circuit simulation experiment
With the continuous development of society and science, people's needs have changed greatly. Of course, electronic technology is indispensable in the reform, and both students and electronic circuit workers regard electronic circuits as their own learning and research content. If you want to learn and study high-frequency electronic circuits, you can't do without experimental exploration after all. Based on the analysis and understanding of the characteristics of high-frequency electronic circuit simulation experiment, this paper designs and studies the high-frequency electronic circuit simulation experiment.
Keywords high frequency electronic circuit, design, practice
High-frequency electronic circuit is well known and concerned by the public because it plays an indispensable role in electronic information technology. In order to understand and even study high-frequency electronic circuits, operating experiments are essential. Generally speaking, high-frequency electronic circuits, students' operation can only be confined to the experimental box, and it is difficult to upgrade the hardware and update the content. According to the characteristics of high-frequency electronic circuit course, combined with the characteristics of SPICE, EWB and MATLAB, the experimental content of high-frequency electronic circuit is optimized.
1. Characteristics of high frequency electronic circuit simulation experiment
In the teaching process, the teacher's teaching method is to carry out theoretical teaching first, then experimental verification, and finally comprehensive curriculum design, but this teaching method can not achieve good results. Traditional classroom teaching focuses on theoretical analysis and the introduction of experimental objects, which is difficult to impress students and leads to students' interest in what they have learned slowly disappearing. If the theoretical analysis of the circuit can be combined with the simulation demonstration of SPICE, EWB and MATLAB in the teaching process, and the theory can be explained and verified at the same time, it will not only enhance the flexibility and intuition of teaching, but also enable students to deepen their understanding of basic theoretical knowledge within effective knowledge, which is more efficient and energetic than traditional teaching methods.
2. Design of high frequency electronic circuit simulation experiment.
In our understanding of high-frequency electronic circuits, we can not only stay in the cognition of individual contents, but also achieve the cognitive effect of the whole high-frequency electronic circuit system, which is conducive to our understanding of related technologies.
1 circuit principle communication system simulation experiment. For the problem that students' understanding in teaching only stays at the formula level, we can design a communication system simulation experiment based on teaching, so that students can deepen their understanding of mathematical models. Because each module in the experiment is based on the unit circuit represented by the module, the principle of solid line is established, which makes the mathematical model more appropriate and vivid.
2. Hardware circuit simulation experiment. In order to combine hardware testing with software simulation, a hardware circuit simulation experiment is designed. We know that high frequency electronic circuit is one of the courses of electronic technology. Besides the related principles, there are many problems about circuit analysis and design.
In the software simulation experiment, we can observe some phenomena that cannot be observed in the hardware circuit experiment. For example, the influence of some parameters in the oscillating circuit on time, the influence of related conditions of circuit parameters on circuit performance and so on. In addition, we can save the cost of experiments without spending a lot of money on related instruments. If students master the use of simulation software, it will pave the way for the later circuit design and application, and they can better understand the analysis, design and optimization of the circuit.
3. Practice of high frequency electronic circuit simulation experiment
1. Simulation experiment research of analog communication system. Simulink in Matlab is a tool with visualization function. Compared with the traditional way, it has the advantages of being more flexible and intuitive, and is more easily accepted by the public. Simulink can simply and flexibly convert the digital model into a software model, so that dynamic simulation experiments can be carried out. This kind of simulation pays attention to operability and system concept. In the operating system, in order to let everyone know more clearly the corresponding relationship among system structure, simulation model and digital model, we can also know clearly the specific transmitting system and receiving system in the displayed interface.
2. Experimental research on circuit simulation. Protel is the most widely used circuit aided design software. The biggest difference between Protel and other software lies in its powerful printing plate design function and circuit schematic design function. Circuit simulation experiments have been widely used in high frequency electronic circuit experiments.
3. Experimental study of receiver circuit simulation. The purpose of receiver electronic circuit simulation experiment is to highlight the unique performance of diode envelope detector and small signal tuning amplifier. In these two experiments, we found that it is very inconvenient to change the hardware parameters, on the one hand, it is a waste of time and energy. So we set up this kind of simulation experiment according to the problems in actual operation to solve many problems in this respect. In the new scheme, the channel check function can quickly detect whether each signal meets the amplitude requirements. If it doesn't meet the requirements, we can let us know where the system is wrong by giving an alarm and then issuing a notice, so as to achieve very concrete results. For coarse code signals, we mainly need to check whether there are high and low level changes. For the fine code signal, we can judge whether these five amplitude standards meet the requirements according to the A/D quantity of the fine code signal. The requirements of these five testing items are: (a) the peak amplitude is less than or equal to 98%; (b) The peak amplitude is greater than or equal to 75%; (c) The valley amplitude is greater than or equal to 2%; (d) The valley amplitude is less than or equal to 25%; (e) The amplitude error is less than 65438 00%.
4. Real-time inspection of coding continuity
If we want to ensure the basic functions of the whole system to work normally, we need the correct coding rate. What is the correct coding? Directly speaking, there is no code skipping. If there is code skipping, the related system will be out of control, and even the whole system will be paralyzed. Because of this, we have added the function of real-time carry check to the encoder signal processing system, which can not only accurately detect the encoder code, but also give an alarm when errors are found, and then inform the upper computer system, so that the upper computer can take corresponding measures in time to avoid huge losses caused by out of control.
In the experiment, we also use parabola fitting algorithm to calculate the position of future position points by sampling several continuous position points at equal time. If the position deviation of the future point is within the error range, we judge that the coding is continuous, otherwise, if an alarm appears and the upper computer system is notified, it is discontinuous.
Verb (abbreviation of verb) conclusion
We use all kinds of simulation software to simulate and analyze the high-frequency electronic circuit, understand its characteristics, and test the change law of output waveform and detected waveform of amplitude modulation signal. The spectrum relationship of key nodes in the circuit is observed and analyzed, and the results are consistent, that is, the virtual simulation results correspond to the theoretical analysis. Applying simulation software efficiently and reasonably to the experimental teaching of high-frequency electronic circuits can make many abstract theoretical teaching more simple and clear, and enable students to learn relevant knowledge from experiments more effectively. Hope that through a series of simulation experiments, it can also be used? Integrated circuit is the foundation of the whole electronic information industry. With the rapid progress of computer technology, the integration of high-frequency circuits has become an important direction of the development of high-frequency electronic circuits. On the one hand, it can save time, on the other hand, it can save costs and shorten the cycle. Therefore, all kinds of concise and convenient simulation software are constantly emerging and widely recognized.
References:
[1] Wu Qingping, Luo Jinhong; Application of PSPICE in simulation analysis of high frequency circuits [J]; Journal of Changzhou Institute of Information Technology; 2003,(02)
[2] Ma Lihua, Xi Hui; Application of MATLAB in power electronics experiment teaching [J]; Laboratory research and exploration; 2005,(02)
[3] Jingbo Liu; ; Construction and exploration of high-frequency electronic circuit practice teaching [J]: Journal of Electrotechnics and Electronics Teaching; 2006,(04)
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