Electronics III - Chapter 1

What is the primary function of an op-amp in its basic operation?

• Amplifies the voltage difference between non-inverting and inverting inputs

• Converts voltage to current

• Filters high-frequency noise

• Acts as a digital switch

In a negative feedback system, what is one of the key advantages mentioned?

• Increases sensitivity to gain variations

• Improves stability and better control of circuit gain

• Reduces the open-loop gain

• Eliminates the need for resistors

In an ideal inverting amplifier, what is the effect on the polarity of the output signal?

• It remains the same as the input signal

• It is opposite to the input signal

• It is always zero

• It depends on the input frequency

In an ideal inverting amplifier, why is no current assumed to flow into the inverting input?

• The input impedance is infinite

• The output is grounded

• The non-inverting input is open

• The feedback resistor is too large

Why is the inverting input in an ideal inverting amplifier considered a "virtual ground"?

• It is physically connected to ground

• Inverting input voltage nearly matches non-inverting input due to high gain

• No current flows through the input resistor

• The output voltage is always zero

What is the primary function of an ideal non-inverting amplifier?

• Inverts the input signal polarity

• Amplifies the input signal without polarity reversal

• Sums multiple input signals

• Converts voltage to current

What is an ideal summing amplifier commonly referred to as?

• Voltage follower

• Signal mixer

• Differentiator

• Integrator

In the ideal differentiator circuit, what is the relationship between the output voltage and the input voltage?

• Vout = -RC Vin

• Vout = -RC dVin/dt

• Vout = Vin/R

• Vout = Vin C

Why is a basic differentiator circuit susceptible to high-frequency noise?

• The capacitor’s reactance increases with frequency

• The resistor limits the current flow

• Capacitor reactance drops with frequency, boosting closed-loop gain.

• The op-amp’s open-loop gain is constant

How can the high-frequency noise issue in an ideal differentiator circuit be mitigated?

• By removing the capacitor

• By adding a resistor in series with the capacitor

• By increasing the open-loop gain

• By grounding the non-inverting input