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