How to use Good Luck Release? What is the best op amp?

Hehe. The capable people are relatively busy and care about national affairs. I'm a little rookie, try your question.

Look at your topic, broadband DC amplifier this is the C question of the 09 National Electric Competition.

It looks like an amplifier, but in essence, it's a difficult question.

The signal frequency required for amplification is very wide, from DC to about 20MHz.

Now for your question:

1.How to use Good Luck Release?

First of all, not only for op amps, but for all integrated circuits, you must go to self-study and study the datasheet given by the manufacturer, which has very large information and typical application circuits. It's not enough to just look at the circuits that others have done, you must study the first-hand information, and the second-hand third-hand information is of little significance.

2.Learn about op amp materials.

The more basic thing is your modular textbook. Then, to talk more deeply, there is a foreign textbook translated by Professor Liu Shutang of Xi'an Jiaotong University called "Circuit Design Based on Operational Amplifiers and Analog Integrated Circuits", which contains very detailed theoretical calculations and can be studied and studied; In addition, the Higher Education Press has a copy of Xidian University, Xi'an Jiaotong University, Xi'an Jiaotong University, Xi'an Institute of Communication of the People's Liberation Army Several old professors compiled the "Electronic Design Guide", focusing on the electronic design competition, very practical, a very good book, you can find a look. In addition, it is the vendor's datasheet, so you must pay attention to this thing.

3.Other suggestions.

Read more books and do more hands. Don't always talk about it. Ask your teacher for advice, you must know that many students are not willing to study hard, and the teacher always holds back their knowledge and does not know who to tell it, so you must seize such an opportunity.

Don't be grateful, just study hard. Hehe.

Don't be discouraged when you encounter difficulties, have the courage to face difficulties and dare to challenge yourself!

The op amp user manual is a good choice.

In the op amp index, some indicators are high, and some are bound to be low, depending on your requirements, there is no best, only and not applicable!

There are many indicators of op amps, such as accuracy, bandwidth, input impedance, noise, output current, whether the output is full of power amplitude, and so on.

No single op amp is the best for all indicators, so the "best" choices will vary depending on the need.

For example, if you amplify a weak signal that changes slowly, a high-precision ICL7650 is good, if you are amplifying a high-frequency signal, you should choose a high-speed op amp, and if the output impedance of the signal source is very high, you should choose a high input impedance op amp such as CA3140.

1.Op amp power supply voltage size and mode selection;

2.Op Amp Package Selection;

3.Op amp feedback mode, i.e. VFA (voltage feedback op amp) or CFA (current feedback op amp);

4.op amp bandwidth;

5.the slew rate, which determines the bandwidth of the full power signal;

voltage and offset current selection;

7.The drift of the offset voltage with temperature, i.e., the magnitude of δvoffset δt;

8.Op amp input impedance selection;

9.Op amp output drive capacity size selection;

10.Op amp quiescent power consumption, i.e., ICC current size selection;

11.op amp noise selection;

12.Op amp drive load settling time.

13.Size and shape selection.

14.Parameter level and accuracy selection.

Here the op amp is used for error amplification, and the resistor capacitance is used for loop compensation, as shown in the following diagram (this is the basic topology of a linear regulator, similar to the circuit you provided).

vin is the ref side, which provides a reference signal. The real feedback signal is to the inverting input of the op amp. The compensation here must be added, and the circuit will oscillate without adding it, although they are all DC signals, but the spectrum of noise is very wide, if the phase shift is not limited by compensation, there may be positive feedback in the high-frequency component of the noise, and the system will oscillate.