Basic Op-Amp Circuits Questions

• For a Wien-bridge oscillator to produce a sustained sine-wave output, the phase shift around the positive feedback loop must be greater than 0°.
• A two-pole active filter produces a roll-off rate of –20 dB/decade.
• The control element in a basic shunt voltage regulator is a zener diode.
• A Wien-bridge oscillator uses _________.
• In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the Acl _______.
• The reference voltage for the comparator in the given circuit equals ______.
• In the given circuit, VIN1 equals ______.
• The ______________ input makes the summing amplifier circuit possible.
• A mathematical operation that determines the rate of change of a curve is called __________.
• A mathematical operation for finding the area under the curve of a graph is called __________.
• The rate of change of the output voltage in the given circuit equals ______.
• The given circuit is a two-pole, active ______ filter.
• In the given circuit, if Rf is reduced to 8 kΩ, the circuit becomes the ______.
• The critical frequency for the active filter in the given circuit is approximately _______.
• Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.