# Dependent Sources and MOSFETs Tutor`s

DependentSources and MOSFETs

Tutor’s

(Date)

1. Diagram of circuit, including measured resistance value. (5 pts)Measured resistance of resistor R=100.3 Ω

A

DMM

100.3Ω

ID

+

_

1. What MOSFET threshold voltage. (10 pts)

Fromthe data table obtained from the experiment the threshold voltage isapproximately 1.5V. Since current appears when voltage goes above1.5V.

1. Attach to this worksheet a table providing your measured gate-to-source voltage vs. drain current values and a plot of data. (15 pts)

 Voltage (V) Current I (mA) 0 0 0.38 0 0.5 0 1.1 0 1.5 0.02 1.77 0.31 1.96 0.77 2.28 1.73 2.97 4.25 3.4 6.2 4.05 9.63 4.75 14.56 5 16.48

4.What type of dependent source is the transistor behaving like? Why?(5 pts)

Thetransistor in this case is behavinglike a voltage dependent current source since the transistor controlsthe current that goes through the circuit based on the voltage on theMOSFET gate.

5.Estimated value of g for circuit. Annotate the plot attached to thisworksheet, indicating how the value of g was determined. (10pts)Usingexcel I obtained the linear part of the plot and calculated the slopeof best fit line of the graph. The slope obtained by Excel is 3.278which is the g for circuit.Estimateg is 3.278

6.DEMO: Have a teaching assistant initial this sheet, indicating thatthey have observed your circuits’ operation. (10 pts)

REFERENCE

AnalogDevices, 2016: Real Analog-Circits 1 DependentSources and MOSFETs.Retrieved

fromhttps://learn.digilentinc.com/Classroom/RealAnalog/circ1/Labs/1/lab1p2p2.pdf