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EENG 3510 > Chapter 2 > Flashcards

Chapter 2 Flashcards

1
Q

What are the internal stages of an op amp?

A
  • Differential Amp Stage
  • High-gain Amp Stage
  • Output Amp Stage
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2
Q

What is an op amp?

A

A DC coupled high-gain electronic voltage amplifier with a differential
input and, usually, a single-ended output

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3
Q

What are the 5 terminals of op amp?

A

*V+: non-inverting input
*V−: inverting input
*Vout: output
*VS+: positive power supply
*VS−: negative power supply

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4
Q

What is a Dual-In-Line or S.O. package?

A

The 741 IC that we used in the lab. (8 pins and rectangular shape)

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5
Q

What is a Ceramic Flatpak?

A

The square shaped 741 IC and 8 pins.

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6
Q

What is Metal Can Package?

A

The circle shaped 741 IC and 8 pins.

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7
Q

What is the inverting input?

A

The negative terminal.

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8
Q

What is the noninverting input?

A

The positive terminal.

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9
Q

What is the minimum number of terminals required by a single op amp?

A

5

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10
Q

What is the minimum number of terminals required on an IC package containing four op amps (called a quad op amp)?

A

14

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11
Q

What is the characteristic of a ideal op amp?

A
  • v3=A(v2 – v1)
  • Infinite input impedance
  • Zero output impedance
  • Zero common-mode gain (Acm = 0)
  • Infinite common-mode rejection
  • Infinite open-loop gain A
  • Infinite bandwidth
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12
Q

Basic (Closed Loop) Op amp Circuits

A

– Inverting amplifier
– Generalized impedances
* Inverting integrator
* Inverting differentiator
– Weighted summer
– Non-inverting amplifier
– Voltage buffer
– Difference amplifier
– Instrumentation amplifier

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13
Q

What is the differential input signal (Vid) ?

A

The difference between the
two input signals v1 and v2 (v2 - v1)

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14
Q

What is the common-mode input signal (Vicm) ?

A

The average of the
two input signals v1 and v2 ((v2 + v1) / 2)

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15
Q

What is v1?

A

Vicm - (Vd/2)

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16
Q

What is v2?

A

Vicm + (Vd/2)

17
Q

Which terminals are grounded and connected to the source in an inverting amp?

A

Negative Terminal Connected to Source
Positive Terminal Grounded

18
Q

Which terminals are grounded and connected to the source in an non-inverting amp?

A

Positive Terminal Connected to Source
Negative Terminal Grounded

19
Q

What is the application of a weighted summer amp?

A

Application: audio systems for mixing signals originating from different musical instruments

20
Q

What is a Buffer Amp?

A

Output voltage is equal in both magnitude and phase to the input source

21
Q

Why are the buffer amps useful?

A

The input impedance of the op-amp is very high, giving effective isolation of the output from the signal source.

22
Q

What is the effect of buffer amps?

A

When very high input impedance, very little current is drawn from the circuit, avoiding “loading” effects

23
Q

CMRR

A

Common Mode Rejection Ratio

24
Q

Common-Mode Gain

A

Ad = Vo / Vcm

25
Q

Differential Gain

A

Ad = Vo / Vd

26
Q

Instrumentation Amp

A
  • Two buffers at the input terminals.
  • W/ additional voltage gain.
  • W/ “floating” configuration.
  • Very high input resistance.
  • High differential gain.
  • Symmetric gain. (Assuming A1 and A2 match.
27
Q

Subtracter Vout

A

V1 - V2
- V1 drives an inverter with a voltage gain of unity, output of first stage –V1.
- Since the gain of each channel is unity, final output voltage equals v1 minus v

28
Q

Averager Vout

A

-(V1 + V2 + V3) /3
When all amplified outputs are added, an output is the average of all input
voltages.

29
Q

Virtual Ground

A
  • Voltage = Zero
  • Current does not go through.
30
Q

Inverting Integrator

A
  • Resistor is connected to negative terminal
  • Capacitor is the feedback
31
Q

Inverting Differentiator

A
  • Capacitor is connected to the negative terminal
  • Resistor is the feedback

EENG 3510 (4 decks)

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