The nine levels of analog circuit design are similar to those of lower chess. After reading from one stage to the other, you will know which stage you are in. Oh worth seeing. You just started entering this line. There is only a general understanding of what PMOS/NMOS/BJT is. You don't know the characteristics of various devices. You have no idea what kind of circuit is designed. Your circuit diagram is mainly Look at the articles in domestic magazines, or according to existing circuits in textbooks, you always feel that they are justified. The circuit that you make is mainly the small-scale module, do the differential amplifier, or the simulation of the band gap reference, you calculate the article, for fear that the paper is not enough. In general, basically see the amplifier or hairpin. You think spice is a very difficult and weird thing. You begin to know what is called circuit design, holding this textbook every day on a draft paper. You often start to mention some technical parameters, Vdsat, lamda, early voltage, GWB, ft and the like. It's always thought that circuits and hands are almost the same, and sometimes they feel that the difference is quite large. You also begin to care about voltage, temperature, and process variations. For example, low-voltage, low-power systems or something. Or what stuff is so high-speed and high-precision? When you designed the circuit, you started planning to tape out, although the tape out still looked far away. In this stage, you think that spice is very powerful, but often it is a big headache because of the wrong AC simulation results. You have been fighting with PVT for some time, but in general there are basically no successful design experiences. You think it's really hard to design a truly usable circuit. You are eager to establish your confidence, but you don't know what to do. You start to read some of the JSSC or doctoral dissertations, but what do you think they say is one thing, real chips or not. What do you think of Vdsat's indicators are not accurate enough, and the emulator's default settings are not enough to meet your requirements, so you try to adjust the parameters of the simulator, or try to replace the simulator, but they still give the result Sometimes it's sometimes not accurate. You go to the forum and you want to get expert guidance. But they are also very ambiguous, and sometimes they say something wrong. In this stage, you think spice is good, but the help book is too unclear. You have had a major tape failure experience. You know that to make a circuit, you need to keep improving and you need to carefully check every detail. You find that there are many problems that have never been envisaged in the design process, and that you want to do a good job of the circuit requires a complete grasp of every aspect. So you began to systematically relearn the textbooks that were sold when you graduated from college. You look closely at the relevant materials that you can find, hoping to find some more inspiring ideas. You already know the circuit metrics and performance that you need to achieve, and you also know that circuit design essentially requires a lot of reasonable compromises. But you can't figure out how this "reasonable" is determined, and how to choose between the different indicators. You feel that it is really hard to design a proper circuit that can work properly. You don’t believe that someone in this world can do what they claim to be so good because the Chengdu website is smart and you feel that you’re faced with such a Choosing helplessness, how can they possibly do it? At this stage, you feel that the spice function is still too limited, and often dazzles with the "TIme step too small" error message. Occasionally you will create a huge simulation file to crash everyone and your computer. You think that many competitors are nothing more than that. You begin to have a more familiar design method. But you don't know how to optimize your tools better. You have used some scripting languages ​​that have been programmed by others, but when you come across a lot of problems, you can't think of them using awk or perl. You start to occupy a lot of server simulation time. You believe that after a lot of simulation, you can clearly adjust the module you design to the right way. Sometimes you think that doing circuit design is simply boring. If it is not enough, you are considering whether or not to give up. In this stage, you feel that spice is good, but it is still far worse than the fast spice series of emulators; you start to distrust AC simulation and replace it with a large number of transient simulations. You begin to understand that there is only the most suitable design in the world and there is no best design. You begin to have a design method that really belongs to oneself, you will be inclined to one kind or two kinds of simulation tools, and can use them to assess your design skillfully. You begin to think about PVT changes in your design. You know the evolution of a circuit from the beginning to the present, and you can tailor them to different applications. You start to pay attention to power consumption and area, and your tape out chips start to have some products that meet the requirements. But sometimes you still can't fully understand the design methods of some complicated systems, and make some stupid mistakes and lead to disastrous consequences. When you start reading JSSC, it's not just a matter of picking up a piece or two. Maybe using JSSC as a toilet reading is a good choice for you. In this stage, you feel that spice is a great tool. You know how to simulate the accuracy and speed in Spice and make the most appropriate choice at any time. You begin to really understand the nature of analog circuit design, whether it is for high-precision systems or high-speed systems have their own unique views and experiences. You can trade off different module metrics at the system level in exchange for the best performance. You will understand a potential market and start your own product definition, and you know that as long as the method is correct, the product you design will be very competitive. You can calmly carry out the function and index division of the entire circuit from head to toe. You understand every technical detail inside and how their compromise will affect your product. You start to pay attention to the reliability of the design. At this stage, you feel that spice is a very useful tool and you liked Monte Carlo simulation, but you often complain that the server is too slow, although you often run simulations late at night. It is common for you to make a chip successfully at this time. It is like driving a veteran driver and stopping with a red light and a green light. The design of a product is almost unconscious to you. You don't need to constantly adjust the parameters and optimizations against the simulation results. More often you need a small amount of simulation to end the design of a module. You can clearly feel that a certain circuit module is technically possible or impossible. You don't have to worry about the noise figure or signal-to-noise ratio or distortion of a specific module at all. You only need to know that it can be designed. More detailed technical indicators are meaningless to you. You start to think that things on the JSSC are actually making up, and sometimes you think the JSSC is not even qualified as a toilet paper (too thin and brittle). You think that spice is good for occasional use, but it's not reliable. It's almost enough to look at the work point. At this time, you are already familiar with many circuits, and you can predict in advance the direction of the next round of many technologies. You only run several simulations a year, and it may be a simulation for a few years. When you rarely draw circuit diagrams, most of the time you are playing golf or fishing on a small island in the Pacific Ocean. Apart from the occasional affair on the ISSCC, you never talk about circuits with others because you know no one can understand.
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