Eletronics-Operational Amplifiers
Eletronics-Operational Amplifiers
31. An output that is proportional to the addition of two or more inputs is from which type of amplifier?
- differentiator
- difference
- summing
- analog subtractor
32. In a PLL, to obtain lock, the signal frequency must:
- come within the lock range
- be less than the capture frequency
- come within the capture range
- be greater than the capture frequency
33. An ideal amplifier should have:
- high input current
- zero offset
- high output impedance
- moderate gain
34. A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms?
- 1.4 mV rms
- 650 mV rms
- 4.55 V rms
- 0.455 V rms
35. The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals:
- the ratio of the input resistance to the feedback resistance
- the open-loop voltage gain Aol
- the feedback resistance divided by the input resistance
- the input resistance
36. What is the difference between common-mode and differential-mode input signals?
- phase relationship
- voltage
- current
- apparent power
37. A circuit that uses an amplifier with passive filter elements is called a(n):
- relaxation oscillator
- signal generator
- differential amplifier
- active filter