[I just tried two chapters without going to prevent theft, and the subscription will be reduced immediately. What can I do? Realistic and various forms of sentient beings.]

...

Gao Jian was completely in an educative tone. Liu Chen took a breath and thought to himself, it’s really a long time since no one dared to guide me on skills, so just listen. If you don’t say it well, I will guide you.

"I ask you, how do you turn the negative and half-week cycle of a sine waveform to the positive and half-week cycle? What is this called transformation?"

"Well, this is called..." Huang Kai pretended to think, and Zhang Jun said, "Is it a rebellion?"

"Didn't that turn the original positive half-week signal into negative again? What's the difference between it and the original signal? I don't understand it so simply. There is this transformation in elementary school mathematics, absolute value! The circuit that implements this function is called an absolute value circuit. I ask you, how many ways are there to process the absolute value of the signal?" Gao Jian was very popular.

Now the two of them have no idea. It’s okay to read a book and deal with the exam. The theory and practice cannot be combined at all. They are not even able to distinguish between basic electronic components.

The two of them squeaked.

Gao Jian was furious: "Have you learned power electronics technology in vain?"

The two of them still couldn't keep up with their thoughts, their faces flushed a little, and they were scolded very badly.

"Ha, Dr. Gao, I can't remember it now, just tell us."

"Yes, I can't remember it."

Gao Jian asked: "Does the rectifier circuit have a bridge circuit?"

“There is this.”

"yes."

The two became vocal insects.

"What happens if four diodes are connected in series and then connected in parallel, depending on the unidirectional conductivity of the diode?"

"Um……"

"Forehead……"

I can't keep up with the idea at all.

Gao Jian's tone was even more severe, "Is it equivalent to absolute value processing when the signals entered from both ends and then taken out from the middle connection point?"

You two are so stupid pigs! You are holding back this sentence, and your fair faces are red.

After hearing what he said, the two nodded repeatedly and said yes.

Gao Jian snorted, looked at Liu Chen and Han Jiaren again, his eyes stayed on Liu Chen, condescending. He showed off his superiority in his skills, "Do you understand?"

Obviously he was very upset about not asking him just now.

Liu Chen nodded and asked, "Let's understand, the signal is a weak signal. Unlike the rectifier structure commonly used in strong power in switching power supplies, the bridge circuit composed of four diodes does have the effect of absolute value processing."

"I didn't realize that you really understand a little."

More than just understanding a little, Liu Chen smiled and said, "But Brother Gao, have you ever thought that the one-way conduction of the diode actually requires a start-up current. This start-up value is very small and can be ignored when dealing with strong electricity, but the signal is weak. In this way, it will distort when crossing the zero point and the signal will be distorted."

Liu Chen was surprised that Gao Jian was questioning his skills in person, and he was more angry. His temperament was already arrogant, and today he encountered something that made him extremely frustrated and angry. He couldn't control his temper at all, and he sneered: "Of course I know, that's not simple. Didn't I add an op-amp circuit in front of the bridge circuit? Do you know what it does?"

"Using the characteristics of op amps' virtual shortness and virtual breaking, the signal strength is enhanced without changing the original signal pattern and turning the passive signal into an active signal."

Gao Jian stared at him with bright eyes, but he didn't expect the boy to answer. He shouted: "What can I achieve the purpose of enhancing the signal by changing?"

Most people probably can't answer this question, and few people go into it in depth.

Liu Chen smiled and said, "It's actually equivalent to changing the input impedance of the signal." He asked back: "This method is indeed feasible, but why not directly design an absolute value circuit composed of an operational amplifier and diode? It's a bit too bulky to use four diodes to form a bridge."

Liu Chen completely answered it and asked a new question. Gao Jian said angrily: "This is the most practical and effective circuit, such as the one that separates the positive and negative half-cycle signals first. On one side, the op-amp circuit is reversed and then synthesized together is even more unsimple and impractical. It also requires at least three op-amps, which is also costly!"

He couldn't stand any technical doubts and almost ran away angrily, as if Liu Chen was just a disgusting man who hugged the girl he was pursuing early in the morning and wanted to grab Liu Chen's neckline and punch him a few times.

Alas, I was busy with my undergraduate studies and my master's studies. I was about to study for a doctorate. I felt lonely and by chance. I met a pretty girl and I was able to chat with her. The young man who had just fallen in love encountered such a thing.

The blow is not bad.

Liu Chen touched his chin, pretending to be thinking, and saying it directly would make him too embarrassed, but it would just dampen his aura rather than a blow.

Gao Jian thought to himself that he had seen this knowledge from somewhere. What did a boy who just came here know? How many circuit boards have I designed? How many switching power supplies have I debugged? Compared with me, it is still far behind!

He couldn't stand any technical doubts and said angrily.

Liu Chen is still thinking.

Gao Jian said aggressively: "Have you not figured it out yet? Or do you have no idea at all?"

Huang Kai relaxed and said: "Brother Jian's absolute value circuit is very practical and very good!"

Zhang Jun also said: "That's right, Dr. Gao is a big hardware expert, you can't make a mistake!"

About five minutes passed.

Liu Chen found paper and pen, quickly drew three absolute value processing circuits composed of op amps and diodes, and said calmly: "I can only think of three circuits for a moment. You can try it if it is feasible."

Gao Jian snorted and took it to look at it, frowned, and Huang Kai and Zhang Jun also looked over.

"I'll leave in advance. Next time I will come and study with Senior Brother Gao for more advice." Liu Chen has been delaying this for a long time, and it's time to find Professor Chang.

In Gao Jian's eyes, this is just because he is afraid of being exposed and fled. Can this casual circuit be used?

It's simply funny! Is a stable structure circuit so easy to design? These three pictures even mark the parameters of the components.

It would be nice for a graduate student to understand some complex circuits. Looking at Huang Kai and Zhang Jun, both waste materials, can’t even understand them.

Gao Jian couldn't tell whether it was possible or not. The operational amplifier would increase the complexity of the circuit analysis, and it was difficult to see the effect at once. Seeing that Liu Chen was about to leave, he shouted: "Wait a moment! Can it be used? Just use P-p-p-m to do simulation!"

Liu Chen shook his head slightly and stopped.

Sure enough, he is a master of technology. Gao Jian is proficient in various tools. He opened the p-p-private m on the computer and quickly made a simulation model based on the first picture. He added a sine wave signal source in front and a detection point in the output. His fingers clicked and dragged quickly on the mouse. He was very skillful and dazzled several people. Han Jiaren was admired.
Chapter completed!