Summary of Digital-Analog Circuits

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Summary of Digital-Analog Circuits [Copy link]

Author: JimXiao9 Submitted: 2006-3-14 20:42:00

Analog section

　　1. AC circuit with non-single parameter (5 points, one multiple-choice question and one long question)

　　Through the above two figures, I have concluded that the basic characteristics of non-single parameter circuits are that if the components are connected in series, their currents are the same, but what about the voltage? Because according to the single parameter AC path, the voltage of the inductor leads the point current by 90 degrees, and the voltage of the capacitor meets the point current by 90 degrees. Therefore, the coordinate axis of Figure a can know the relationship between the various components, and then according to this formula, the value of each point current, point voltage, resistance, and impedance can be calculated (some conditions are given). The same is true for parallel circuits.

　　A few points to note:

　　1. The voltage of the parallel circuit is fixed, and the current of the series circuit is fixed

　　2. When Xl>Xc, it becomes inductive; Xl

　　3. How to calculate active power.

　　II. Application of Thevenin's Theorem (8 points)

　　This is the focus of Chapter 2. Please read the book for details! You will understand it all after doing a few questions. The content to be mastered is:

　　1. The voltage across the load after the circuit is open (choose one to find the potential: 1 point)

　　2. How to calculate the equivalent resistance: the current source is turned on and the voltage source is short-circuited (there will be a question about calculating the equivalent resistance: 1 point)

　　3. Be able to draw equivalent circuits

　　3. Single tube amplifier circuit

　　Here are three key points: (For details, see Chapter 5)

　　1. Common emitter AC amplifier circuit, page 91;

　　2. Voltage-divider biased common-emitter amplifier circuit, page 102;

　　3. Common collector amplifier circuit (output device design), page 104.

　　You must know the static operating points of the three amplifier circuits and the methods of calculating Au, ro and ri. Don't get confused. The main thing is to master the drawing methods of each micro-variable equivalent circuit and branch flow path, and then summarize and see what you think of it. Tip: It is best to understand how their relationship is derived, so that it will be easier to remember.

　　IV. Integrated operational amplifier (12 points, two questions)

　　I think these 12 parts are the easiest. They are the contents of Chapter 7. I suggest you write down the amplification formulas of each circuit in the book, and then you will have no problem.

　　There are four basic ones:

　　1. Inverting input proportional operation;

　　2. Common-phase input ratio operation;

　　3. Integral operation circuit;

　　4. Voltage comparator (know what reference voltage is).

　　These are the four most basic ones I think. The others can be a combination of them. There are also circuits with Zener diodes and diodes that need to be analyzed.

　　5. Using Karnaugh Maps to Check Logic Functions (4 points)

　　There is nothing to say. If you don't know, don't take the test. One thing to note is that the four corners with 1 can be drawn into a big circle.

　　6. Analysis of the amplifier circuit (4 points)

　　This is basically easy, there are such possibilities:

　　1. There is no bias resistor, that is, Ib=0, and there is no current.

　　2. There is no output voltage, which may be caused by a short circuit of the capacitor.

　　Digital part

　　VII. Analysis of Combinational Logic Circuits (4-8 points)

　　This is the content of Chapter 3. It mainly involves knowing the steps to analyze circuits and being able to design simple logic circuits. Don’t forget to simplify the logical expressions. You are required to be able to write the truth table of the circuit, and then there will be basically no problem.

　　8. Write the function expressions of ROM array logic and PLA array logic (4 points)

　　This is easy. Just know the concept. No problem. It’s on pages 308 and 310 of the book.

　　IX. Analyze sequential circuits (8 points)

　　This is the highlight of digital circuits. In fact, there is nothing much to say. You just need to remember the four basic triggers and don't forget the characteristic equation (there is one multiple-choice question and one fill-in-the-blank question, 2 points), and then know the analysis steps. Just take it step by step, and you will be ok.

　　Supplements to each sub-topic:

　　I have mentioned several multiple-choice questions in the above content, so I will not repeat them here. There are also a few that will definitely be tested that I will mention:

　　1.555 timer;

　　2. OCL complementary symmetric circuit;