Tips | How to determine the three levels of MOS tubes?
I believe that many engineers know about MOS tubes when they use electronic measuring instruments. Let’s take a look at what MOS tubes are.
1. How to determine the three poles of MOS?
The three pins on the MOS tube symbol must be grasped to identify the key points:
Needless to say, the G pole is easier to recognize. S pole, whether it is P channel or N channel, is where the two lines intersect. D pole, whether it is P channel or N channel, is the side of the separate lead.
2. Is it N channel or P channel?
After determining the polarity of the three pins, it is time to determine whether it is P channel or N channel:
Of course, you can also determine the channel type first, and then determine the polarity of the three pins. After determining the channel, determine the polarity of the three pins.
3. How to determine the direction of the parasitic diode?
Next, is the direction judgment of the parasitic diode:
Its judgment rule is: N channel, points from S pole to D pole; P channel, points from D pole to S pole.
4. Simple judgment method
The above method is not easy to remember. A simple identification method is:
(Imagine that the three broken lines on the DS side are connected)
Regardless of N-channel or P-channel MOS transistors, the direction of the arrow on the intermediate substrate and the direction of the arrow on the parasitic diode are always the same: either from S to D, or from D to S.
5. What is the function of MOS tube?
On the notebook motherboards we face every day, the MOS tube plays a very important role: the switching function.
The above MOS switch implements signal switching (high-low level switching). Let's look at an example of a MOS switch implementing voltage switching. An example of a MOS switch implementing voltage switching: 1.5V circuit generated from 1.5V_SUS
After reading the previous examples, can you summarize "the connection method of MOS tubes in the circuit when used as a switch"? In fact, the key is to determine which pole is connected to the input terminal; which pole is connected to the output terminal.
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