Experiment Report: Measuring Parameters of a Common Source Amplifier, Assignments of Digital Systems Design

Download Experiment Report: Measuring Parameters of a Common Source Amplifier and more Assignments Digital Systems Design in PDF only on Docsity! Section & group no.: ________________ Roll No.:________________ © Department of Electrical Engineering Page 1 of 4 University of Engineering and Technology Lahore EE216:Electronic Devices & Circuits Experiment 11 Objectives • To measure the following parameters of a Common Source Amplifier o Voltage Gain: Av o Input Resistance: Rin o Output Resistance: Rout o Maximum output swing Abbreviations DSO: Digital Storage Oscilloscope DMM: Digital Multimeter Components required 2N7000 NMOS,10 KΩ, 1.2 KΩ, 4.7 KΩ, 2x10 KΩ variable, 2x10uF. I have read and understood the NOTES section. Signature: Name: Date: NOTES • Always measure the currents by measuring the voltage drop across the resistors • Keep all connections as short as possible. • Before applying DC power supplies to the circuit make sure that they are all set to zero volts. • Switch off the power supplies before making any change in the circuit. • Always measure a resistor “out of circuit” • Use a pencil to draw all the graphs. Section & group no.: ________________ Roll No.:________________ © Department of Electrical Engineering Page 2 of 4 University of Engineering and Technology Lahore vsrc must be kept constant throughout the experiment, unless specified otherwise. 1- Connect the circuit shown in Figure 1. Set the 10 KΩ variable resistor R2 to achieve ID = 2 mA current. Measure VGS and make sure it is >= 0.7 V. If this is not the case, replace the transistor. VGS:________ 2- Using the signal generator, set vsrc so that vout is 1 V (pk-pk) sine wave, keeping the frequency at 10 KHz. Measure voltage gain Av as vout (pk-pk) / vsrc (pk-pk). Neglect 1/gm in the formula of Av for calculations: vsrc (pk-pk) :_________ Av(calc.):___________ Av(meas.):___________ 3- Observe vsrc and vout simultaneously. Measure the phase difference between vsrc and vout. Phase of vout (calc.):_________ Phase of vout (meas.):_________ Figure 1 4- We will measure the Rin by emulating a 10 KΩ variable resistor as a source resistance. We know that: 𝑣𝑜𝑢𝑡(𝑤𝑖𝑡ℎ 𝑅𝑠𝑟𝑐) = 𝑣𝑜𝑢𝑡(𝑤𝑖𝑡ℎ𝑜𝑢𝑡 𝑅𝑠𝑟𝑐) 𝑅𝑖𝑛 𝑅𝑖𝑛 + 𝑅𝑠𝑟𝑐 Now if Rsrc = Rin , 𝑣𝑜𝑢𝑡(𝑤𝑖𝑡ℎ 𝑅𝑠𝑟𝑐) = 1 2 𝑣𝑜𝑢𝑡(𝑤𝑖𝑡ℎ𝑜𝑢𝑡 𝑅𝑠𝑟𝑐) where vout (without Rsrc) = 1 Vpk-pk. Connect a 10 KΩ variable resistor in series with the signal generator shown in Figure 2. Adjust the variable resistor so that vout(pk-pk) becomes 10K var R2 vout VDD 15V + - vsrc + 10 uF R1 10K RD 4.7K RS 1.2K