Chapter 8: Operational Amplifier

What is the voltage gain of an ideal inverting amplifier?

• 1 + Rf / Rin

• Rf / Rin

• -Rf / Rin

• -(Rin / Rf)

In a non-inverting amplifier, the input is applied to:

• Inverting terminal

• Non-inverting terminal

• Both terminals

• None of the above

In an INVERTING amplifier, if the input signal is 2V and the feedback resistors are Rf = 10 kΩ and Rin = 5 kΩ, what is the output voltage?

• -4V

• -2V

• 2V

• 4V

For an ideal op-amp, the input impedance of a non-inverting amplifier is:

• 0

• Infinite

• Equal to the feedback resistor

• Equal to the input resistor

In a summing amplifier with three inputs V1, V2, and V3, the output voltage is given by:

• Vout = Rf (V1 + V2 + V3)

• Vout = -(Rf/R1 V1 + Rf/R2 V2 + Rf/R3 V3)

• Vout = (V1 + V2 + V3)/Rf

• Vout = -V1 / Rf

What is the function of a comparator circuit?

• To amplify input signals

• To compare two input voltages and output a high or low signal

• To invert the input signal

• To buffer the input signal

In a multistage amplifier, the total voltage gain is:

• The sum of the voltage gains of each stage

• The difference between the voltage gains of each stage

• The product of the voltage gains of each stage

• The voltage gain of the final stage

Which configuration provides a phase inversion between the input and output signals?

• Non-inverting amplifier

• Inverting amplifier

• Buffer amplifier

• Comparator

In a NON-INVERTING amplifier, if the input signal is 2V and the feedback resistors are Rf = 10 kΩ and Rin = 5 kΩ, what is the output voltage?

• 4V

• 6V

• 10V

• 12V

The multistage amplifier has 3 stages of amplification with gain 2, 6, and 3. What is the overall gain of this multistage amplifier?

• 11

• 15

• 36

• None of the above