Part-I Voltage Gain Measurements 1. Build the following circuit shown in Figure-

Question

Part-I Voltage Gain Measurements 1. Build the following circuit shown in Figure-3) with Vcc and - Vcc of +15 V and 15 V, respectively. Use RF-5 k ? and R1-1 K ?. 2. Display the input signal Vin on Chl of the CRO, and the output signal vo on Ch2 (Note: See Pin-out information provided in figure-2) 2 6 3 OLrr Figure-3 Inverting Amplifier circuit diagram 3. Set the function generator to produce a 10 mVp 1 KHz sine wave. 4. Measure the input voltage Vin at pin-2. p-p) 5. Measure the output voltage Vo at pin-6. (p-p) 6. Calculate the voltage gain. 7. Now increase the frequency by factor of two (that is 2 KHz) and measure the output voltage Vo. Calculate the gain Av. Record all values in Table-1 p-p) 8. Repeat this step until you reach 128 KHz. 9. Plot the gain versus the frequency of the input signal (This is called Frequency Response of the Amplifier) 10. Calculate the voltage gain at f- 1 KHz, 500 KHz, and 1 MHz. Compare with the measured results in Table-

Explanation / Answer

The above circuit shows the 1st question answer. It is an op-amp inverting amplifier.

4. To measur the input voltage , set function generator 10 mVp,1 KHZ sine wave

the peak to peak input voltage of inverting op amp is 10*2 = 20 mV p-p

Input voltage Vin = 20 mv p-p

5. Output voltage Vo at pin 6 is

Vo = -Rf / R1 x Vin

Rf = 5 kilo ohms R1 = 1 kilo oh Vin = 20 mv p-p

Vo = - 5 / 1 x 20

Vo = - 100 mvp-p

Conclusion : Vin = 20 mvp-p Vo = - 100 mvp-p . The input and output voltages are inverted so it is called as inverting amplifier.

6. voltage gain Av = -Vout / Vin = Rf / R1

Rf = 5 kiloohms R1 = 1 kilo ohm

Av = 5 kilo ohms/ 1 kilo ohm

Av = 5

Therefore the closed loop gain of the above inverting op amp is 5 .

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