Electronics-Operational Amplifiers
Electronics-Operational Amplifiers
21. In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will:
- swing negative
- close the loop
- be balanced
- swing positive
22. With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio?
- –87.9 dB
- –43.9 dB
- 43.9 dB
- 87.9 dB
23. If the input to a comparator is a sine wave, the output is a:
- ramp voltage
- sine wave
- rectangular wave
- sawtooth wave
24. What three subcircuits does a phase locked loop (PLL) consist of?
- phase comparator, comparator, and VCO
- phase comparator, bandpass filter, and VCO
- phase comparator, bandpass filter, and demodulator
- phase comparator, low-pass filter, and VCO
25. The major difference between ground and virtual ground is that virtual ground is only a:
- voltage reference
- current reference
- power reference
- difference reference
26. If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?
- Common-mode
- Single-ended
- Double-ended
- Noninverting mode
27. If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value?
- 7.82 V
- saturation
- cutoff
- 9.52 V
28. The Schmitt trigger is a two-state device that is used for:
- pulse shaping
- peak detection
- input noise rejection
- filtering
29. When a capacitor is used in place of a resistor in an op-amp network, its placement determines:
- open- or closed-loop gain
- integration or differentiation
- saturation or cutoff
- addition or subtraction