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Results tagged with fet
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user 6334
Field Effect Transistor, a transistor in which most current is carried along a channel whose effective resistance can be controlled by a transverse electric field. Commonly used types of FETs include the Metal Oxide Semiconductor FET (MOSFET), and less common in recent designs, the Junction Gate FET (JFET or JuGFET).
5
votes
Accepted
Is the FET gate resistance counted on the RC time constant?
Your model doesn't make a lot of sense. You probably want something more like this
simulate this circuit – Schematic created using CircuitLab
The buffers here represent ideal devices, with the …
- 134k
6
votes
Accepted
OP amp voltage comparator for an FET
Second, choose one that can drive enough output current to pull the FET gate full swing quickly enough. On chat, you mentioned the DMG9M65CT, whose datasheet gives a gate capacitance of 2.3 nF. …
- 134k
6
votes
Accepted
Mosfet won't turn fully on
Since the gate is held at about 0.5*VBAT by the voltage divider R7 and R8, anything that tends to drive the source above this level will start to turn "off" the FET. … If you want to use it as a switch, you have a few options:
Move the NMOS FET to the low side of the load.
Use a PMOS FET on the high side and invert the gate-drive logic. …
- 134k
3
votes
AC analysis of a Bias Tee
Why DC current is frequency dependent,
Because at low frequecies the inductor (L1) doesn't do a good job of blocking signals from the AC source
it should have been a constant of about \$i=\frac{1 V …
- 134k