Op-amp Applications

A certain op-amp has an open-loop gain of 80,000. The maximum saturated output levels of this particular device are ±12 V when the DC supply voltages are ±15 V. If a differential voltage of 0.15 mV rms is applied between the inputs, what is the peak-to-peak value of the output?

• 24 Vpp

• 28 Vpp

• 30 Vpp

• 0 Vpp

Determine the output level for the comparator circuit shown. Suppose ±V_sat = ±14V.

• 1 V

• 0 V

• +14 V

• -14 V

Determine the output level for the comparator circuit shown. Suppose ±V_^sat = ±14V.

• 2 V

• 0 V

• +14 V

• -14 V

Determine the output level for the comparator circuit shown. Suppose ±V_sat = ±14V.

• +7 V

• +5 V

• +14 V

• -14 V

Calculate the V_UTP and V_LTP for the op-amp Schmitt trigger. V^_out(max) = ±10 V.

• V_^UTP = 7.23 V, V_LTP = -7.23 V

• V_UTP = 2.77 V, V^_LTP = -2.77 V

• V_UTP = 10 V, V_LTP = -10 V

• V_UTP = 7.23 V, V_LTP = 0 V

What is the hysteresis voltage for the op-amp Schmitt trigger?

• 5.54 V

• 2.10 V

• 7.25 V

• 3.80 V

A 6.2 V zener diode is connected from the output to the inverting input of the Schmitt trigger circuit, with the cathode at the output. What are the positive and negative output levels?

• 8.57 V and -0.968 V

• -8.57 V and 0.968 V

• 7.23 V and -2.77 V

• -7.23 V and 2.77 V

What is the frequency and peak-to-peak value of the square wave output signal generated by the op-amp circuit? Suppose V_sat = ±14 V.

• f₀ = 1.7 kHz and V_out = 28 V_pp

• f₀ = 17 kHz and V_out = 28 V_pp

• f₀ = 1.7 kHz and V_out = 14 V_pp

• f₀ = 17 kHz and V_out = 14 V_pp

The relaxation oscillator drives the integrator. Assume that the peak voltage from the relaxation oscillator is 13.5 V. If the integrator has R₄ = 10 kΩ and C₂ = 10 μF, what is the peak-to-peak value of the triangular output wave?

• 13.5 V

• 20 mV

• 40 mV

• 27 V

The triangular-wave generator shown here has the following circuit values: R₁ = 1 kΩ, R₂ = 100 kΩ, R₃ = 10 kΩ, R₄ = 100 kΩ, and C = 10 μF. What is the peak-to-peak output if V_sat = 13 V? What is the frequency of the triangular wave?

• V_out = 0.26 V and f = 250 Hz

• V_out = 0.13 V and f = 250 Hz

• V_out = 0.26 V and f = 2500 Hz

• V_out = 0.13 V and f = 2500 Hz