Deck 54: The Operational Amplifier

Question 1

The operational amplifier is often used as a level detector or ____________________.

Answer 1

comparator

Question 2

In the inverting amplifier, which formula is used to calculate the amount of gain in the circuit?

A) R1 x R2
B) R2\R1
C) (R1 + R2)\R1
D) R2 \(R1 + R2)

Answer 2

B

Question 3

What is the difference between an oscillator and a pulse generator?

Answer 3

The difference between an oscillator and a pulse generator is the period of time the output is on compared to the period of time it is low or off. For instance, an oscillator is generally considered to produce a waveform that has positive and negative pulses of equal voltage and time. However, in a pulse generator, the positive pulse is of a much shorter duration than the negative pulse.

Question 4

The ____________________ of the amplifier is controlled by the ratio of resistor R2 to resistor R1.

Question 5

The op amp has two inputs, the ____ input and the ____ input.

A) eight-pin; sixteen-pin
B) inverting; noninverting
C) field effect; MOS
D) resistor; capacitor

Question 6

As a general rule, the 741 operational amplifier is not operated below a gain of about 100.

Question 7

In what three basic circuits are op amps used?

Question 8

All op amps use bipolar transistors for input.