Analog circuits. Before the control chip came out, all electronic devices used analog circuits. The world's first computer was built entirely with analog circuits, which covered a very scary area!

Therefore, all the functions that can be realized in digital control chips and analog circuits can be realized.

Addition, subtraction, multiplication, division, etc., absolute value circuits are also considered to be one of analog circuits. It is not difficult to say, but not easy to say. The most important thing is to use very commonly used devices, diodes.

The diode itself is unidirectional, and current can only flow from one end to the other, but the other side cannot. This is the basis of the absolute value circuit.

For both technical teenagers, they understand the basic knowledge of analog circuits, otherwise Chen Guohua would not laugh when he heard that it was an absolute value circuit and would not make a joke, and he thought it was too easy.

The two of them did not hesitate. The competition began soon. The various devices in the laboratory were very complete. They built circuits separately and soldered them with a blank board. Because the circuit itself was not complicated, Chen Guohua shook his head disdainfully while doing it. It was too simple!

In power electronics technology, there is a bridge rectifier circuit that can be used as a weak current absolute value circuit. Four diodes are connected in series and then parallel. The signals are connected at both ends in parallel. The two intermediate points in series are the absolute value signals!

This is an absolute value circuit. Chen Guohua completed it in about 1 minute. He plugged in four diodes and led out the four points connected in parallel and series. How long does it take?

Think about it, I think the circuit composed of this pure diode is too rough. The diode is a passive device. The circuit composed of is a passive circuit and requires driving power.

When the input signal is too weak, it may not be able to drive the diode to conduct! Thinking of this problem, Chen Guohua solved it with a change of thought, which was too easy to deal with. Add an op-amp circuit in front to turn the passive signal into an active signal.

Op-amps have the function of changing the input and output resistors of front and rear stages.

"Done!" In less than ten minutes, Chen Guohua finished work and looked at Liu Meng who was still busy.

Liu Meng didn't care about his situation and chuckled. He continued to weld his own circuit. His circuit was a little complicated and used two op amp structures.

In analog circuits, op-amps and comparators are the two most basic devices, especially op-amps. The functions that can be achieved by using the characteristics of virtual shortness and virtual breaking are beyond imagination.

"Okay." After about a quarter of an hour, Liu Meng also completed the production of the circuit.

But from the appearance, Chen Guohua's circuit failed, but Chen Guohua didn't think so. "You can think of such a simple circuit, and compare it with it!" Chen Guohua said with a pout.

"Simple is not simple. After comparing, I realized that I can enter a set of signals with triangles, pulses, and random noise to see the effect." Facts are better than words, and Liu Meng is too lazy to care about who is better and who is worse first.

Chen Guohua was also very skilled. He immediately wrote a program to use the FPGA to emit a set of sinusoidal signals with extremely loud noise, which were respectively connected to the circuits welded by two people. The waveforms observed with an oscilloscope.

An expression of calmness was originally seen, and I couldn't help but scream. "Why is this happening?"

As expected, Liu Meng was not surprised at all and said: "Implementing functions is only the initial stage. Implementing functions at high quality and industrial levels is what a mature product needs to have."

Chen Guohua's face suddenly turned red. Liu Meng wanted to hit his arrogance, and then said: "Diodes are a very rough device, and they should be used as little as possible. You used four at once. If it is a beautiful waveform signal input, the output signal is not obvious, but with more clutter noise, the temperature deviation of the diode and zero-point drift all ran out. After all, it is a passive device."

It is obvious that Chen Guohua's absolute value circuit has shown obvious zero point drift. This is because with noise, the diode cannot find the exact zero point. After the absolute value is transformed, the waveform is distorted, while Liu Meng's circuit is relatively much better.

"Why?" Chen Guohua couldn't help but ask, this was obviously the simplest circuit.

"My absolute value circuit has two op amps, only two diodes are used, and they cancel each other out zero point drift. The input signal is connected to the negative phase of the first op amp through the first resistor. The positive phase of the first op amp is grounded, and the second resistor is connected to the output. The input signal is connected to the positive phase of the second op amp through the second resistor. The third resistor is connected in series with the first fast diode, the fourth resistor is connected in series with the second fast diode, and the two series circuits are connected in parallel between the negative phase and the output of the second op amp. The direction of the first fast diode and the second fast diode is opposite, and the parameter errors are canceled out. The contact point of the third resistor and the first fast diode or the contact point of the second fast diode is connected to the negative phase of the second op amp through the fifth resistor."

Liu Meng explained the principle of his circuit in one breath.

"All electronic devices will produce errors, which are particularly obvious in extreme environments. When considering the circuit structure, you must think of this point, otherwise you can only achieve good results when you are in an ideal state. What's the use? Just like many music players on the market nowadays can also play music, but the sound quality is so bad, which is why."

Liu Meng talked freely, and he wanted to attack Chen Guohua. The technology work must be because of a fanatical interest and can immerse himself in and study. The biggest disadvantage is that he is too proud. After this grinding, maybe Chen Guohua can really improve one more stage and become a technical master.

Chen Guohua was hit and his face turned bloody. He was even more ashamed and embarrassed than the argument with Aunt Qiu just now. However, he also knew that Liu Meng's level and vision were indeed much higher than him.

He is still in the stage of realizing his functions. He thinks he is awesome all day long and doesn't take anyone seriously.

After comparing with Liu Meng, I realized that there is heaven beyond heaven and there are people outside of others, and I can't help feeling ashamed and negative.

The main reason is that Chen Guohua has been developing products but has not entered the market, and users have no exact feedback. Naturally, he has never thought about striving for excellence to improve performance.

"Brother Liu, it is indeed an extremely excellent technical talent. We are really ashamed of comparing with you."

Wang Meng saw that Liu Meng was indifferent and unique, unlike an exaggerated person. With this move, he believed that what he said was true. He really used his own technology to create a world, which was far better than the two. He thought that following this kind of boss who was engaged in technology and commercial promotion was the best choice.

After a while, Chen Guohua swallowed a few words, "I lost, you are much better than me, convinced."

He has a straightforward personality, you are really better than him. He is convinced.

Liu Meng smiled and patted his shoulder, "Actually, your skills are no worse than mine, but I took a little advantage. This circuit is what I know well, and it is also careless for a moment. It's understandable. Don't take it to heart."

The blow is almost done, so you should give a sweet date at the right time.

He didn't want to force the two of them too much. Liu Meng said immediately, "It's just a technical exchange. As for whether he agrees with my acquisition plan, you should think carefully. Let's do it. Today we will leave first. Within three days, we will consider it clearly and call me at any time."

Originally, Chen Guohua and Liu Meng's fight meant that they would agree to the acquisition if they lost, but Liu Meng laughed it off and obviously didn't want to make a fuss about it. This made Chen Guohua feel better about him and couldn't help but lower his head.

As he said that, Liu Meng pulled the two girls away. After he got outside, the two girls gasped hard, and Cheng Fei shouted, "I almost suffocated to death. I really can't understand the world of otaku. It's so scary. I saw a few young men crawling around just now."

Min Ran also patted her chest, "That's right? One of them almost crawled on my feet. No wonder these otakus couldn't find a girlfriend."

Liu Meng smiled in his heart when he heard this, and remembered himself before, which was similar to these two people. He always wanted to create a great product and find a girlfriend when he succeeded. It was really a deviation and was not down-to-earth.

He smiled and said, "Two sisters, thanks to you today. I'll treat you to a big meal and take me to the car city."

The two girls were naturally little chickens pecking at rice and nodded in agreement.

"Wow, Xiao Mengzi, I didn't expect that your skills are so powerful. These two are famous madmen in our school. They are above the top and don't even take the lecturers seriously. They have confronted each other several times in person, otherwise there wouldn't be any class that has not been able to take the exam." Min Ran looked at Liu Meng with his eyes shining brightly and said.

In fact, most teachers in college, especially those who teach basic courses, just make a living. The research is not necessarily in-depth. It is normal for students who do not have specialized to be awesome, but there are still very few people who are refuted in person by students. After all, they must respect teachers and respect their principles.

Min Ran felt that he hadn't seen each other for three months. Although he saw that Liu Meng was still the same, his abilities were completely different. He was mature, calm, confident, and firm, and he had the qualities that a successful entrepreneur had.

Cheng Fei's feelings were roughly the same, and he couldn't help but secretly glance at this junior. He still remembered that because he wanted to experience the feeling of a green train, he met Liu Meng, a simple boy. How long has it been, he grew up so fast.

"I have a specialty in my career. He was so proud of me that I asked me to have a problem. Why would I be polite to him? Of course I have to choose the one I know most, haha." In front of my sisters, it would be better to be humble, otherwise I would be punished.

"No, not bad, Xiao Mengzi, my sister has decided, don't you have a factory in Ice City? My sister is having sex with you! How about it?" Min Ran said with a smile.

"How can I accommodate Sister Min Ran, my little temple, be it? I can't do it, I can't do it."

"Your sister Min Ran is a family of law and is a law student. When the company grows bigger, this aspect is bound to be indispensable. You kid, you can seize the opportunity quickly. There will be no such store after passing this village." Cheng Fei said teasingly.

When Liu Meng heard this, he realized that Min Ran was actually studying law. Thinking that during the last trial of Huang Sheng, there was indeed a lack of a capable legal talent, he hurriedly bowed and said sincerely: "I don't know Taishan, I apologize to Sister Min Ran. I beg to join, but we are still small now, can we get paid?"

"You kid wants to treat your sister as Yang Bailao? Sure enough, he is a traitor. He looks like a pirate boss. Why do you feel like you are on a pirate ship? No, no, Cheng Fei can't escape. She is a dual cultivation economy and finance, which is even more in short supply." Min Ran knew that Liu Meng was joking, but pretended to shout.

Cheng Fei smiled pursed her lips, "You guys have had a good conversation, why are you doing this again?"

When Liu Meng heard this, he found that it was Cheng Fei or a talent in this field. His small company really needed it. Su Ling was a rare talent in sales. It is important to hand over the law and financial convenience to someone he trusted. And he really doesn’t need to stay in charge at the moment. He just needs to deal with it on weekends.

There is no one available at my hand, so it is a good choice to invite two girls in. The team should be trained in advance, otherwise the development will become bigger and bigger, and the shortcomings in these aspects will be obvious at that time.

At that moment, Na Tou bowed again and said the lines just now, which made Cheng Fei laugh.

After two more invitations, the two women "ruthlessly" agreed.

The gains of this trip are really great. The prototype of his small company is already very complete. In terms of technology, Chen Guohua and Wang Cheng are still very good. The sales are handed over to Su Ling, the legal affairs are Min Ran, the finances are Cheng Fei, and I am responsible for the intellectual property rights. Haha, it is really a comparison for large foreign companies.

It’s up to the news from Huacheng Electronics. I hope these two people won’t act impulsively, they can see the situation as soon as possible and make a decision in a timely manner.

While happy, Boss Liu immediately launched a bribery attack and invited the two sisters to have a big meal, have a feast, and have some wine. It was so good.

The next day, we went shopping together in the car city. This car city is famous for cars. Almost half of the city is wrapped in a giant car manufacturing factory. It is not a provincial capital. It was moved here on a major transportation road and there are very few views available.

After half a day, I took a look at some attractions and went shopping together. Liu Meng hung up big bags on his body, and took the responsibility to become a young follower.

"Xiao Mengzi, you are all a little boss now, and you are still a follower for your sisters. Do you want to?" Min Ran said with a smile.

"Yes, if you don't want to raise it, we are all very democratic and will not force you." Cheng Fei continued.

After saying that, both of them looked at the coolie man in a slight manner.

"What are the words of the two sisters? It is my honor to be your followers. Others have not had this opportunity yet!" Liu Meng pretended to argue very seriously.

He really had the intention of winning over two women. His small company was just starting out, and Du Yi would never sit idly by and watch himself grow bigger. He would inevitably make trouble and needed talents from all walks of life.

PS: In the future, try to update at around 8 o'clock in the evening, and usually update two chapters directly. Oh, I need to review the exam, and the fat man is already faster as soon as possible. In the past two days and weekends, 7,000 words a day, which is quite good. Please support the subscription.
Chapter completed!