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Analog circuits, before the control chip came out, all electronic equipment used analog circuits, and the world's first computer was built entirely with analog circuits, which covers a very scary area!

Therefore, the functions that can be realized in the digital control chip can be fully realized by the analog circuit.

Addition, subtraction, multiplication, division, etc., absolute value circuit is also regarded as a kind of analog circuit, it is not difficult to say, it is not easy to say easy, the most important thing is to use a very commonly used device, diode.

Diodes are inherently unidirectional, and current can only flow from one end to the other, not vice versa, which is the basis of absolute value circuits.

For the two technical nerds, the basic knowledge of analog circuits is understood, otherwise Chen Guohua will not laugh when he hears that it is an absolute value circuit, and he thinks it is too easy.

The two did not hesitate, the game started immediately, and all kinds of devices in the real room were complete, building circuits separately and soldering them together 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, which can be used as an absolute value circuit for weak current, four diodes are connected in parallel after two by two, and the two ends of the parallel connection signal are connected, and the two middle points of the series are the absolute value signal!

This is an absolute value circuit, Chen Guohua can do it in about 1 minute, plug in four diodes, and draw out the four points of parallel and series connection, how long can it take.

Come to think of it, I think that this kind of circuit composed of pure diodes is too rough, and the diode is a passive device. The circuit is composed of passive circuits that require driving power.

When the input signal is too weak. Thinking of this problem, Chen Guohua solved it with a turn of his mind, it was too easy to deal with, and an operational amplifier circuit was added in front of it to turn the passive signal into an active signal.

The operational amplifier has the effect of changing the input and output resistance of the pre- and post-stages.

"That's it!" In less than ten minutes, Chen Guohua called it a day, and looked at Liu Meng, who was still busy, very proudly.

Liu Meng didn't care about the situation on his side, and chuckled at the corner of his mouth. Continuing to solder his own circuit, his own circuit is slightly more complex, using a two-op amp structure.

In analog circuits, operational amplifiers and comparators are the two most basic devices, especially operational amplifiers, which can achieve unimaginable functions by using the characteristics of virtual shortness and virtual breaking.

"Alright. "About a quarter of an hour. Liu Meng also completed the production of the circuit.

But judging from the appearance, Chen Guohua's circuit failed, but Chen Guohua didn't think so, "Such a simple circuit, you can think of it, take it out and compare!" Chen Guohua pouted and said.

"It's not easy. After comparison, I realized that I would like to see the effect by passing in a set of signals with triangular, pulsed, and random noise. Facts speak louder than words, and Liu Meng doesn't bother to care about who is superior and who is inferior.

Chen Guohua is also very skilled, and immediately wrote a program to use the Fpga to generate a set of sinusoidal signals with extremely noisy noise, which were passed into the circuit soldered by the two people. Waveform observed with an oscilloscope.

originally had a calm expression, but couldn't help but scream. "Why is this happening?"

Unexpectedly, Liu Meng was not surprised at all, and said: "The realization of the function, that is only the initial stage, high-quality, industrial-grade realization of the function, this is what a mature product needs to have." ”

Chen Guohua's face turned red all of a sudden, Liu Meng just wanted to hit him a little arrogant, and then said: "The diode is a very rough device, which should be used as little as possible, and you use four at once, if it is a beautiful waveform signal input, the output signal is not obvious, but there is a lot of clutter noise, and the temperature deviation and zero drift of the diode are all running out, after all, it is a passive device." ”

Obviously, Chen Guohua's absolute value circuit has obvious zero drift, this is because of the noise, the diode can not find the accurate zero point, after the absolute value transformation, the waveform is distorted, and Liu Meng's circuit is relatively much better.

"Why?" Chen Guohua couldn't help but wonder, this is obviously just the simplest circuit.

"My absolute value circuit has two operational amplifiers, only two diodes are used, and they cancel each other out of zero drift, the input signal is connected to the negative phase of the first operational amplifier through the first resistor, the positive phase of the first operational amplifier is connected to ground, and the negative phase is connected to the output with a second resistor; the input signal is simultaneously connected to the positive phase of the second operational amplifier through the second resistor, the third resistor is connected in series with the first fast diode, the fourth resistor is reverse 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 operational amplifier, and the first fast diode is in opposite directions to the second fast diodeThe contact between the third resistor and the first fast diode or the contact between the fourth resistor and the second fast diode is connected with the negative phase of the second operational amplifier through the fifth resistor. ”

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

"All electronic devices will produce errors, especially in extreme environments, when considering the circuit structure, we must think of this, otherwise there is no surface, can only achieve the ideal state of the good effect, what is the use? ”

Liu Meng talked eloquently, he was sincere to hit Chen Guohua, engaged in technology, must be because of a fanatical interest, very immersed in the study, the biggest shortcoming is too proud, after this time of grinding, maybe Chen Guohua can really improve another stage, really become a technical master.

Chen Guohua was shocked, his face was blood-red, and he was even more ashamed than the dispute with Aunt Qiu just now, he was simply embarrassed, but he also knew that Liu Meng's level and vision were indeed much higher than him.

He is still in the stage of implementing functions, and he thinks he is awesome all day long, and no one pays attention to him.

Compared with Liu Meng, I knew that there was a sky outside the sky, and there were people outside the world, so I couldn't help but feel a little ashamed and negative.

The main reason is that Chen Guohua has been opening products and has not gone to the market, and users have no exact feedback. Naturally, I didn't think about improving performance.

"Brother Liu, he is really an excellent technical talent. The two of us are really ashamed to compare ourselves to you. ”

Wang Wei saw that Liu Meng's bearing was indifferent, different, not like an exaggerated person, this shot, he believed that what he said was true, and he did use his own skills to create a world, far better than the two. I want to follow this kind of boss who is engaged in technology and commercial promotion, which is the best choice.

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

He's just straightforward, and you're really better than him. He was also convinced.

Liu Meng smiled and patted him on the shoulder, "Actually, your skills are not worse than mine, but I took advantage of it, this circuit is familiar to me, and it is also careless, but it is understandable." Don't take it personally. ”

The blow is almost over, and I still have to give a sweet date when the time is right.

didn't want to force the two too much, Liu Meng said immediately, "It's just a technical exchange, as for whether to agree with my acquisition plan." The two of you should think about it carefully, so be it. Today we will go first, within three days, think it through, call me at any time. ”

Originally, the competition between Chen Guohua and Liu Meng meant that he would agree to the acquisition if he lost, but Liu Meng laughed it off, obviously not wanting to make a fuss about it, which made Chen Guohua feel better about him, and couldn't help but bow his head.

Saying that, Liu Meng pulled the two girls away, and after they got outside, the two girls gasped hard, and Cheng Fei shouted, "I almost suffocated me, the world of otaku, I really can't understand it, it's so scary, I saw a few Xiaoqiang crawling around just now." ”

Min Ran also patted his chest, "It's not, one of them almost climbed on my feet, no wonder these otaku can't find a girlfriend." ”

Liu Meng smiled when he heard this, remembering that his former self was similar to these two people, thinking about making a set of awesome products all day long, and finding a girlfriend when he became famous, it was really a deviation and not grounded.

smiled and said: "Two sisters, thanks to you today, please have a big meal, and then take the little brother to tour the car city." ”

The two girls were naturally chickens pecking rice, nodding in agreement.

"Wow, Xiao Mengzi, I didn't expect your skills to be so powerful, these two are well-known madmen in our school, their eyes are above the top, and they don't even pay attention to the teacher who lectures, and they have bumped into each other several times in front of them, otherwise there would be no class that has been passed the test. Min Ran looked at Liu Meng with bright eyes and said.

In fact, most of the teachers in the university, especially those who teach basic courses, are just eating with a mouth, and the research is not necessarily in-depth, and students who are not specialized are awesome, which is normal, but it is still very rare to be refuted by students in person, after all, it is necessary to respect teachers.

Min Ran felt that he hadn't seen him for three months, although he looked at Liu Meng and was still the same Liu Meng, but the ability he showed was completely different, mature, indifferent, confident, and firm, and he already had the essence of a successful entrepreneur.

Cheng Fei's feeling was about the same, and he couldn't help but sneak a few glances at this junior, and remembered that he met Liu Meng, a simple boy, because he wanted to experience the feeling of a green train, how long has it been, and he has grown up so fast.

"I have a career specialty, it's he who has raised it himself, let me have a topic, and be polite to him, of course, I have to choose the one I am most familiar with, haha. "In front of my sisters, it's better to be modest, otherwise I will be poisoned.

"Yes, yes, Xiao Mengzi, my sister has decided, don't you have a factory in Bingcheng, my sister is messing with you!," Min Ran said with a smile.

"How can my small temple accommodate the great god of Sister Min Ran, I can't help it, I can't help it. ”

"Your sister Min Ran is a legal family, and she studied law, and the company will become bigger in the future, this aspect must be indispensable, you kid don't hurry up to seize the opportunity, there is no such shop in this village." Cheng Fei said with a smile.

When Liu Meng heard this, he knew that Min Ran was actually studying law, thinking that when Huang Sheng tried the court last time, he really lacked a competent legal talent, so he bowed his head and said sincerely: "The kid has eyes and doesn't know Mount Tai, and he has made amends to Sister Min Ran, so I beg to join, but we are still small now, can we waive the salary?"

"You kid want to treat your sister as Yang Bailao's envoy? Sure enough, she is cunning, at first glance, she is a black-hearted boss, how can she feel like she is on a thief ship, no, no, Cheng Fei can't run, she is double studying economics and finance, which is even more scarce. Min Ran knew that Liu Meng was joking, but he also pretended to shout.

Cheng Fei pursed her lips and smiled, "You guys talked about it well, what do you care about me?"

When Liu Meng heard it, it turned out that Cheng Fei was still a talent in this area, his small company really needed it, Su Ling was a rare talent in sales, and it was very important to hand over the legal and financial convenience to someone he trusted, and he really didn't need to sit all the time at present, just deal with it on the weekend.

I don't have anyone at hand, so it's a good choice to invite the two girls in, and the team must be cultivated early, otherwise the exhibition will get bigger and bigger, and the shortcomings in these aspects will be obvious at that time.

At that moment, he bowed his head again, and said the lines just now, which made Cheng Fei giggle.

I asked for two more invitations, and the two girls "reluctantly" agreed.

The harvest of this trip is really not small, the prototype of this 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 finance is Cheng Fei, and the intellectual property rights are responsible for themselves, haha, it is really a match for large foreign companies.

It depends on the news from Huacheng Electronics, I hope that these two people will not be rash, and they can see the shape clearly and make a decision in time.

In addition to being happy, Boss Liu immediately launched a buying offensive, and invited the two sisters to have a big meal, feast, and drink some wine.

The next day, we walked around the car city, which is famous for its cars, and almost half of the whole city is wrapped in a giant car factory, which is not a provincial capital, and has only moved here because of the traffic artery, and there are very few views to see.

In half a day, I took a look at some scenic spots, and then went shopping together, Liu Meng hung a big bag on his body, and he was responsible as a little follower.

"Xiao Mengzi, you are now a small boss, and you are still a follower to your sisters, are you willing?" Min Ran said with a smile.

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

After saying that, both of them looked at the coolie man narrowly.

"What the two sisters said, it's my honor to be your follower, and others haven't had this opportunity yet!"

I really have the idea of encompassing the two daughters in my heart, my small company has just started, Du Yi will definitely not sit back and watch himself become bigger, and he will not be able to produce a moth, and he needs talents from all walks of life.

ps:In the future, I will try to update it at about eight o'clock in the evening.,Generally update two chapters directly.,Hey,To review the exam.,The fat man's degree has been as fast as possible.,These two days and weekends.,Seven thousand words a day.,It's not bad.,Please support the subscription.。