# Lab 8

# Lab #8

# MOSFET BASICS

** 1. OBJECTIVES:**

To introduce you to the Metal Oxide Semiconductor Field Effect Transistor (MOSFET).

** 2. COMPONENTS USED AND SPECIFICATION:**

– BS170 MOSFET

– Several Resistors

– DC power supply

– Multimeter for voltage and current readings

– Waveform generator

– Oscilloscope with probes

– Computer with Multisim software for computer simulations

– Wire, alligator clips, and a breadboard

**3. DC Analysis:**

Figure 1

**a)** For the Figure 1 find the following: VG, VD, VS, VDS, VGS, and ID. Assume the MOSFET is in the Saturation region. If the results turn out to be a contradiction, recalculate your results for the correct region. Finally, state what region the MOSFET is in and your justification for your decision. For your calculations use: Vt = 1.824V, µnCoxW/L = 75.61mA/V2.

**b)** Assemble circuit as shown in Figure-1 **(Rsig= 10KΩ, R1= 500KΩ, R2= 500KΩ, RD= 6KΩ, RS= 6KΩ, RL= 2KΩ, VDC= 15V, and all capacitors are very** **large) **and measure the values (both software simulation and hardware)**.**

**4. AC Analysis:**

Figure 2

**a) ** Calculate the AC analysis values using the T-Model shown in Figure 2. Find RIN, ROUT, ro, gm, A*vo*, A*v*, and G*v*.

**b)** Assemble circuit shown in Figure-1 **(Rsig= 10KΩ, R1= 500KΩ, R2= 500KΩ, RD= 6KΩ, RS= 6KΩ, RL= 2KΩ, VDC= 15V, and all capacitors are very** **large) **and measure the values (both software simulation and hardware)**.**Set the sine wave generator to 50mVpp and 1KHz .Explain the discrepancy, if the measured gains are not within ± 0% of the calculated gains.

*Lab report is individual and Analysis part should be on your own words.*

*The Lab report must include**all lab procedures, all the observations from hardware and software simulations, and a detailed analysis*.

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