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The Inverting Mode Op-Amp The Inverting Mode Op-Amp

The Inverting Mode Op-Amp - PowerPoint Presentation

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Uploaded On 2015-10-17

The Inverting Mode Op-Amp - PPT Presentation

What is the Inverting Mode The opamp can be connected up in various ways or modes What it does depends on how it is connected up When connected up in the inverting mode it changes positive voltages to negative voltages It may also make them larger ID: 163902

mode amp gain inverting amp mode inverting gain output connected voltage input resistor voltages amplifier feedback solution

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Slide1

The Inverting Mode Op-AmpSlide2

What is the Inverting Mode ?

The op-amp can be connected up in various ways or

modes

.

What it does depends on how it is connected up.

When connected up in the inverting mode, it changes positive voltages to negative voltages. It may also make them larger.Slide3

The Inverting Mode Op-Amp

+

-

V

1

V

o

R

f

R

1

0 V

+V

s

-V

s

The

feedback resistor

(

R

f

) is used to control the gain of the op-amp.

The input voltage is fed in through the

input resistor

( R

1

).Slide4

Revision – The Gain of an Amplifier

You may remember from Standard Grade that the gain of an amplifier is the ratio of the output and input voltages.

 

The gain can also be expressed in terms of the resistors used to connect up the op-amp.

 Slide5

The Inverting Mode Gain Equation

 Slide6

Example 1

+

-

15 mV

V

o

200k

Ω

10 k

Ω

0 V

+V

s

-V

s

Calculate the output voltage from the op-amp below

.Slide7

Example 1 - Solution

 Slide8

Example

2

+

-

15 mV

-6 V

R

f

10 k

Ω

0 V

+V

s

-V

s

What size of feedback resistor would be required to produce an output voltage of – 6 volts ?Slide9

Example

2 - Solution