I believe that many engineers know MOS transistors when they use electronic measuring instruments. Let’s take a look at what MOS transistors are.
1. How to determine the three poles of MOS?
The identification of the three feet on the MOS tube symbol should grasp the key points:
G pole, needless to say, is easier to recognize. For the S pole, whether it is a P-channel or an N-channel, the two lines intersect. The D pole, whether it is P-channel or N-channel, is the side of the separate lead.
2. Are they N-channel or P-channel?
After the polarity of the three pins is judged, it is time to judge whether it is P-channel or N-channel:
Of course, you can also determine the channel type first, then determine the polarity of the three pins, and then determine the polarity of the three pins after the channel is determined.
3. How to determine the direction of the parasitic diode?
Next, the direction of the parasitic diode is judged:
Its judgment rule is: N channel, from S pole to D pole; P channel, 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 intermittent lines on the DS side are connected)
Regardless of N-channel or P-channel MOS transistors, the arrow direction of the intermediate substrate and the arrow direction of the parasitic diode are always the same: either all point from S to D, or all point from D to S.
5. Can MOS tube be used for it?
On the notebook motherboards we face every day, MOS tubes have a very important function: switch function
The above MOS switch realizes signal switching (high and low level switching). Let's look at an example of MOS switch to realize voltage on and off, an example of MOS switch to realize voltage on and off: +1.5V_SUS generates +1.5V circuit
After reading the previous example, can you sum up the "connection method of MOS tube 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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