DC Analysis of a MOSFET Transistor Circuit

Posted on Feb 6, 2014

When doing DC analysis, all AC voltage sources are taken out of the circuit because they`re AC sources. DC analysis is concerned only with DC sources. We also take out all capacitors because in DC, capacitors function as open circuits. For this reason, everything before and after capacitors are removed, which in this circuit includes resistor, Rs.

DC Analysis of a MOSFET Transistor Circuit
Click here to download the full size of the above Circuit.

Now let`s do the calculations for DC analysis. Vgs is the voltage that falls across the gate and the source of the mosfet transistor. It is crucial to calculate because in order to solve for Ids, the current from the drain to the source, Vgs must be known. Once you solve for Ids, you will get two currents from solving that quadratic equation. The current that produces a Vgs which is greater than Vtn is the real current of the circuit and the other should be eliminated.

Leave Comment

characters left:

New Circuits



Popular Circuits

PC controls light dimmer
NiCads charger
RF wireless allarm magnetic switch PIC16F84
Audio-Frequency Doubler
12V 50W Switching Regulator by UC3844N
how do sim card works on mobile phones
AVR Dongle
using doorbell circuit control things radio control
Stroboscope Uses White LEDs
Thermocouple amplifier gain circuit