Op Amps

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# Op Amps - PowerPoint PPT Presentation

Op Amps. Op-Amp Terms. Op-Amp- An active circuit element designed to perform mathematical operations of addition, subtraction, multiplication, division, differentiation and integration. (Textbook) High performance linear amplifier that requires a power source to operate. Gain-

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## PowerPoint Slideshow about 'Op Amps' - sandra_john

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Presentation Transcript

Op-Amp Terms

• Op-Amp-
• An active circuit element designed to perform mathematical operations of addition, subtraction, multiplication, division, differentiation and integration. (Textbook)
• High performance linear amplifier that requires a power source to operate.
• Gain-
• Amount of amplification produced by an Op-Amp. Gain is independent from the supply voltage (power given for the Op-Amp to operate).

Stuff The Book Dosen't Tell You

• Open-Loop Mode-
• Function of an Op-Amp when the feedback resistor (Rf) is zero. The Op-Amp operates as a comparator and not as a linear amplifier.
• Comparator-
• Compares the –V and +V inputs to see which is greater and returns a result.
• Bandwidth-
• The range of frequency at which an Op-Amp will function.
• (Ideal = ∞)

Input Offset Voltage-

• Even when there is no input voltage the Op-Amp gives off a small voltage. This can be canceled out by use of the Offset Null pin on the chip.
• (Non-Ideal)
• Common Mode Rejection Ratio (CMRR)- Ability of an Op-Amp to reject a signal applied to both inputs simultaneously.
• Slew Rate (V/µs)-
• Amount of time it takes for the Op-Amp to step to another voltage level. (Non-Ideal)

Total Harmonic Distortion (THD) (%)-

“Percent Error” of an Op-Amp. Amount of deviation from the ideal output signal. (Non-Ideal)

Large Amount of TMD

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8

2

7

3

6

4

5

741 Op-Amp

Maximum Ratings

Supply Voltage ±18 V

Power Dissipation 500 mW

Diff. Input Voltage ±30 V

Input Voltage ±15 V

Operating Temperature 0°C to 70°C

Characteristics

Input Offset Voltage 2 to 6 mV

Input Resistance .3 to 2 MΩ

CMMR 70 to 90 dB

Bandwidth .5 to 1.5 MHz

Slew Rate .5 V/µs

Offset

Null

Unused

- IN

+ V

+

-

Out

+ IN

Offset

Null

- V

1

8

2

7

3

6

4

5

1458 Dual Op-Amp

Maximum Ratings

Supply Voltage ±18 V

Power Dissipation 500 mW

Diff. Input Voltage ±30 V

Input Voltage ±15 V

Operating Temperature 0°C to 70°C

Characteristics

Input Offset Voltage 1 to 6 mV

Input Resistance .3 to 1 MΩ

CMMR 70 to 90 dB

Bandwidth .5 to 1.5 MHz

Offset

Null

Unused

-

+

- IN

+ V

-

+

Out

+ IN

Offset

Null

- V

1

8

2

7

3

6

4

5

386 Audio Amplifier

Maximum Ratings

Supply Voltage ±15 V

Power Dissipation 660 mW

Input Voltage ±.4 V

Operating Temperature 0°C to 70°C

Characteristics

Input Resistance 50 kΩ

CMMR 70 to 90 dB

Bandwidth 300 kHz

Total Harmonic Distortion 0.2%

+Gain

Gain

Bypass

- IN

-

+

+ V

+ IN

GND

Out

6

5

1

3

4

7

8

9

2

546 Audio Power Amplifier IC

+

-

Phase

Vcc

Bypass

Out

GND

In

Filter

NFB

Characteristics

Slew Rate .5 V/µs

Offset Voltage +3 to +7 mV

Output Current 20 mA

Maximum Ratings

Supply Voltage +3 to +32 V

Operating Temperature 0°C to 70°C

Voltage Noise 40 (nV/√Hz)

-

+

Basic Inverting Amplifier

R2

R1

In

Out

Amplifies and Inverts Input

Gain = -(R2/R1)

R3

+

-

Basic Non-Inverting Amplifier

In

Out

R1

R2

Amplifies Input

Gain = 1+(R2/R1)

-

+

Unity Gain Folower

Waste of an Op Amp?

+V

Out

In

-V

Used to amplify current or buffer signal.

-

+

Non-Inverting Comparator

V ref

V Out

V in

The Hardware “If / Else” Statement

Op Amps Are Cool

Op-Amps have many applications and can be used when a signal needs to be modified, amplified or compared.

Bargraph Voltmeter

+V

R2

LED

R1

+

R1

-

LED

R1

+

R1

-

LED

+

R1

R1

-

LED

+

R1

R1

-

-

+

-

+

-V

+V

In

-

+

Audio Mixer

R1

R1

Source 1

R1

Source 2

Out

R1

R1

Source 3

Jeckyll & Hyde Overdrive

Relient K

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