"If you want to design an analog circuit well, simply break down some circuits and understand them far from enough. Instead, you need to have an in-depth understanding of the operational amplifier. This is the cornerstone. If you truly understand this device, your analog circuit level can reach the first level." Liu Chen said.

Mingyuan disagreed and said, "There are so many things to say about op amps. The main feature is that they are short and ignorant. All the design foundations are based on this."

"If your understanding is only at this level, then you can only be in the introductory stage, even if you have rich experience." Liu Chen said without hesitation, "There are two difficulties in op amps, one is frequency response and the other is feedback, especially feedback. There are very few people who can really understand it. You design a sine wave waveform pre-circuit and add a comparator to change square wave to show me."

"What's the difficulty?" Mingyuan was quite dissatisfied and walked over and drew it quickly on the board on one side. He quickly made a circuit design, and added capacitors and resistors.

"Solve the equivalent circuit with or without Miller compensation separately, find the main pole and bandwidth expression, and eliminate the uncertain impact caused by the near zero point."

Mingyuan opened his mouth a little stupid. What is this? He couldn't understand it at all, and he was confused.

Liu Chen shook his head and said, "The circuit you designed like this cannot even determine the specific values ​​of the resistor and capacitor. It is just a function that is implemented. If it is used to process sound signals, I don't know how much noise it will cause. You don't even have the concept of bandwidth. How to deal with the frequency response of sound? You should also know that this is an important indicator of mp3."

"The software programming processing that enters the main control chip, even if the algorithm is not concise enough, the implementation of functions will have little impact on the sound quality. The key lies in the analog circuits of input and output. The first level I told you before is to be able to calculate manually, watch!"

Walking over, Liu Chen kept writing, and the complex formulas formed a wonderful beauty, and finally came up with several range parameters.

Seeing the formula full of solid formulas, Mingyuan felt a deep sense of frustration. Only then did he truly understand the meaning of the three realms that Liu Chen said. It turned out that he had always been a frog who was watching the sky in a well, and was still complacent all day long.

He lowered his head in shame and annoyed. At this moment, he was completely convinced that the young man in front of him was Yinba's chief engineer. He took a breath and asked, "How did you get to this point?"

Liu Chen smiled and said, "If you want to use the op amp well, the best way is to design it, understand the internal structure in detail, how the differential input tube converts the input voltage into the input current, and how to form a current mirror. What is DC paranoia, rather than the surface false breaks, you can see the so-called surging of the flow in your mind, just like seeing through the flow direction of every capillary in your body, and this is at the second level."

The gap is too big!

Mingyuan became more and more shocked the more he heard it. He was just getting started, and the young man in front of him was at least to the second level! A new world opened in front of him. He was originally complacent, but because he couldn't find the direction of progress. Now he knows how small it is.

The fanaticism in his eyes became more and more intense, and he grabbed Liu Chen's arm and said, "I want to learn, and I want to reach this level, can you teach me?"

"It's OK, but I can't teach you for no reason, and I can't teach you for a while. If you are willing to join the Yinba, it will be much more convenient."

Mingyuan was a little embarrassed, scratched his ears and cheeks very anxious, and said embarrassedly: "But I...I..."

Seeing this, Gong Hui said, "Is there any difficulty in Teacher Mingyuan?"

He waved his hand and said, "Don't mention any teacher. I'm so ashamed of me, but I... because I didn't study hard in college, I didn't pass the CET-4 exam, and I didn't get a degree certificate. I'm a dropout."

When I was looking for a job, I went to the electronics market to work as a repairman because of this, and I made a name for myself step by step, and I was free and easy.

"Why is it hard to say that we Yinba never value academic qualifications and certificates, but have a solid technical level." Liu Chen smiled.

"But I am used to being free and casual. I don't like being controlled by others." Mingyuan really wanted to learn from Liu Chen, but he also understood his own faults.

Most technicians are like this. Liu Chen knows this well. He is also very busy when he is busy. Others are noisy. Researchers in foreign companies were most annoyed by the most complex interpersonal relationships and intrigues. Technicians are like politicians, but now they are not like this in his own company.

"Don't worry, under the entire company's framework, the technicians are divided into groups, not under the jurisdiction of anyone, they are completely free, they only need to complete the final result, just like your current working model. Moreover, given your poor English, I will assign you a master's degree student to become the first free team for Yinba Company."

"Really?" Mingyuan has never heard of this model, and it is too innovative. It would be better if this is the case.

"Of course! Lan Jun, Sister Gong, I also hope that you two will understand my philosophy. Only in the most free environment can technicians exert their maximum creativity and efficiency, and do not interfere with it."

The two nodded. Lan Jun had contacted Liu Chen, and Kang Wenbin knew that once these people started to develop skills, they would ignore their relatives and disagree with each other. At this time, they should definitely stay away from them.

It was Liu Chen who built an atmosphere of technical freedom that made Yinba show extremely high efficiency in his subsequent development, and the value created per capita made scholars who study company management puzzled.

After confirming these things, Mingyuan couldn't wait to ask: "How should I start learning?"

"It's simple. First read Razavi's classic work, de n o analog ic five times, and then read all the papers on op-amps in JSSC for a preliminary understanding, and you will reach the second level." Liu Chen said with a smile.

Ah? Mingyuan instantly turned into a bitter face, but he was never afraid of hardship when he learned technology. He suddenly asked curiously: "Have you reached that third level?"

"In fact, there is also a fourth level above these three levels of realms."

"Ah? What is that?"

"Don't be impatient, you will naturally understand what it is then, and I believe you will definitely reach this level. Let's develop epoch-making products together."
Chapter completed!