ECET 205 Chapter 16: Operational Amplifiers

What usually controls the open-loop cutoff frequency of an op amp?

Compensating Capacitance

A compensating capacitor prevents:

Oscillations

At the unity-gain frequency, the open-loop voltage gain is:

1

The cutoff frequency of an op amp equals the unity-gain frequency divided by:

Closed-Loop Voltage Gain

If the cutoff frequency is 20 Hz and the midband open-loop voltage gain is 1,000,000, the unity-gain frequency is:

20 MHz

If the unity-gain frequency is 5 Mhz, and the midband open-loop voltage gain is 100,000, the cutoff frequency is:

50 Hz

The initial slope of a sine wave is directly proportional to:

Frequency

When the initial slope of a sine wave is greater than the slew rate:

Distortion Occurs

The power bandwidth increases when:

Peak Value Decreases

A 741C contains:

Active-Load Resistors

A 741C cannot work without:

DC return paths on the two bases.

The input impedance of a BIFET op amp is:

Extremely High

An LF157A is a:

BIFET Op Amp

If the two supply voltages are ± 12 V, the MPP value of an op amp is closest to:

24 V

The open-loop cutoff frequency of a 741C is controlled by:

A Compensating Capacitor

The 741C has a unity-gain frequency of:

1 MHz

The unity-gain frequency equals the product of closed-loop voltage gain and the:

Closed-Loop Cutoff Frequency

If f-unity is 10 MHz and midband open-loop voltage gain is 200,000, then the open-loop cutoff frequency of the op amp is:

50 Hz

The initial slope of a sine wave increases when:

Peak value increases.

If the frequency of the input signal is greater than the power bandwidth:

Slew-Rate distortion occurs.

An op amp has an open base resistor. The output voltage will be:

Maximum positive or negative.

An op amp has a voltage gain of 200,000. If the output voltage is 1 V, the input voltage is:

5 uV

A 741C has supply voltages of ± 15 V. If the load resistance is large, the MPP value is approximately:

27 V

Above the cutoff frequency, the voltage gain of a 741C decreases approximately:

20 dB per decade.

The voltage gain of an op amp is unity at the:

Unity-Gain Frequency

When slew-rate distortion of a sine wave occurs, the output:

Appears Triangular

A 741C has:

All of the above.

The closed-loop voltage gain of an inverting amplifier equals:

The feedback resistance divided by the input resistance.

The noninverting amplifier has a:

Large closed-loop input impedance.

The voltage follower has a:

Closed-loop voltage gain of unity.

A summing amplifier can have:

Two or more input signals.