module 4 and 5

Choose the effect of negative feedback amplifier

• Decrease the distortion

• Increase the noise

• Increase the voltage gain

  Determine the voltage gain with feedback for voltage series feedback having A= -150, Zi = 20KΩ, Zo = 50kΩ for feedback of β = -0.2

• -4.83

• -3.34

• -6.00

Name the circuit which has employed negative feedback.

• Amplifier

• Oscillator

• Filter

 Select the feedback system in which the feedback signal is fed in phase with input signal.

• Positive

• negative

• both negative and positive

Predict the output of a practical differential amplifier, if same signal is applied to both inputs.

• not equal to zero

• same as the input signal

• zero

Recall the expression of closed loop voltage gain (A_F) in terms of open loop gain (A) and feedback factor (β)

• A_F =A/Aβ

• A_F =A/(1+Aβ)

• A_F =A/A-β

Choose the amplifier in which the input impedance can be decreased from 5KΩ to 1kΩ.

• Voltage shunt feedback amplifier

• Voltage series feedback amplifier

• Current amplifier

At what condition the differential amplifier operate in common-mode configuration?

• When same voltage is applied to both input terminal.

• When different voltage is applied to both input terminal

• When input voltage is equal to the output voltage

Determine the value of CMRR, if A_DM = 3500 and A_CM = 0.35

• 10000

• 1000

• 0.010

Determine the output impedance with feedback for current series feedback having A=-50, Zi = 6KΩ, Zo=10KΩ for feedback of β = -0.1

• 57 KΩ

• 60 KΩ

• 40 KΩ