Quiz 2 (04) Flashcards
A differentiator is used to measure
the rate of change of the input voltage
In a comparator with output bounding, what type of diode is used in the feedback loop?
Zener
How many op-amps are required to implement this equation? Vo = V1
1
A ______ filter rejects all frequencies within a specific band and passes all those outside this band
band-stop
A _____ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band.
band-pass
Only the condition Ba = _____ must be satisfied for self-sustained oscillations to result
1
The attenuation of the three-section RC feedback phase-shift oscillator is
1/29
The feedback signal in a(n) _______ oscillator is derived from a capacitive voltage divider in the LC circuit.
Colpitts
Which of the following oscillators is (are) tuned oscillators?
Crystal, Colpitts and Hartley (All)
An ideal op-amp circuit has _____ input impedance, ________ output impedance, and _____ voltage gain
infinite, zero, infinite
The output signal of an op-amp is _____ out of phase with its input signal connected to the inverting input terminal
180 degrees
Negative feedback results in
decreased voltage gain
In which of the following are operational amplifiers (op-amps) used?
Oscillators, Filters, Instrumentation Circuits (All)
The output voltage of a summing amplifier is proportional to the sum of the input voltages (T or F)
True
The positive feedback voltage in an oscillator has no net phase shift (T OR F)
True
Crystal oscillators are inherently unstable (T or F)
False
Oscillators operate on negative feedback (T or F)
False
A band-pass filter can be created by cascading a high-pass filter and a low-pass filter (T or F)
True
An active filter uses capacitors and inductors in the feedback network (T or F)
False
A second-order filter has a roll-off of -20 db/decade (T or F)
False
The common mode rejection ratio (CMRR) is a measure of an op-amp’s ability to reject common-mode input signals (T or F)
True
Open-loop gain is always smaller than closed-loop gain (T or F)
False
Closed-loop gain is the gain with negative feedback (T or F)
True
