Step 21: Driver Caps, Resistor Networks and Mosfets
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Update: Thanks to David K. A much more understandable description is provided: A B C
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| N |_________P________| N | Two N-type semiconductor regions are sunk into a P-type substrate. If a voltage is applied in either direction between A and C, the PN junctions will act as diodes, one forward biased and one reverse biased. Therefore, no current will flow. Applying a positive voltage to the B contact will drive the positive charge down and out of the region between the A and C contacts, temporarily making it N-type. The electric field of the B contact is what causes the charge to move, thus Field Effect. So in effect, you have a single continuous N-type region, and current can flow. The higher the voltage on B, the more P-charge moves, the thicker the resulting N region, and the more current can flow. The A contact is called the Source, where you connect the signal you want to control, the B contact is called the Gate, which is probably pretty obvious, and the C contact? Well, I can't tell you what it's called, because you don't want to hear the word. David is an avid viewer that is taking on this project successfully, you will see his creation on the upcoming "Creations Gallery" page.
____|___ _______|______ ____|____
------------| |------------------| |------------
| N |_________P________| N | Two N-type semiconductor regions are sunk into a P-type substrate. If a voltage is applied in either direction between A and C, the PN junctions will act as diodes, one forward biased and one reverse biased. Therefore, no current will flow. Applying a positive voltage to the B contact will drive the positive charge down and out of the region between the A and C contacts, temporarily making it N-type. The electric field of the B contact is what causes the charge to move, thus Field Effect. So in effect, you have a single continuous N-type region, and current can flow. The higher the voltage on B, the more P-charge moves, the thicker the resulting N region, and the more current can flow. The A contact is called the Source, where you connect the signal you want to control, the B contact is called the Gate, which is probably pretty obvious, and the C contact? Well, I can't tell you what it's called, because you don't want to hear the word. David is an avid viewer that is taking on this project successfully, you will see his creation on the upcoming "Creations Gallery" page.