Noninverting Amplifier

3.3 Noninverting Amplifier

Figure 3–2 shows area 100 equipped with a single operational amplifier configured as a noninverting amplifier with single-supply power input.

Basic setup is done by choice of input and feedback resistors. The transfer function for the circuit as shown is:

VOUT +VIN ￿1 )R112R109￿)VREF1￿

The input signal must be referenced to VREF1.

To cancel the effects of input bias current, set R102 = R112 R109, or use a 0-jumper for R102 if the operational amplifier is a low input bias operational amplifier.

The TL431 adjustable precision shunt regulator, configured as shown, provides a low impedance reference for the circuit at about 1/2 V1+ in a 3 V system. Another option is to adjust resistors R113 and R111 for the desired VREF1 voltage. The formula for calculating VREF1 is:

VREF1 +1.24 V￿R111R113)R113

Figure 3–2. Noninverting Amplifier With Single Supply Using Area 100

 

 

 

 

 

V1+

 

 

 

 

V1+

 

 

 

 

 

 

 

 

 

 

C107

C108

 

 

 

R110

 

 

 

0.1 F

10 F

 

 

A101+

 

 

GND1

 

 

 

 

 

 

 

Jumper

 

 

 

Jumper 102 – to VREF1

 

 

 

 

 

 

R109

 

 

C105

C104

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A102–

 

 

 

 

 

 

 

 

 

 

V1–

 

 

 

 

 

A103+

R103

 

 

 

 

 

 

 

 

 

 

Power Supply Bypass

V1–

 

A104–

R102

 

 

 

 

 

 

 

 

 

 

 

 

 

V1+

 

 

 

 

+

 

 

 

R108

 

 

 

 

Vin

 

 

 

2.2 k

 

 

 

 

 

 

 

 

 

 

 

 

Jumper

 

 

VREF1 = 1.24 V

 

 

 

 

R111

 

 

 

 

C106

 

 

 

C

 

 

 

10

F

 

 

R

A

U102 = TLV431ACDBV5

 

Input Signal With

 

 

 

 

 

 

Reference to VREF1

 

R113

 

 

 

 

 

 

 

 

Voltage Reference

 

 

 

 

 

R114

 

C110

 

 

 

 

C109

 

R112

 

 

 

 

 

 

 

 

 

 

 

V1+

 

VOUT = VIN(1 + R109R112 )+ VREF4

 

2

7

8

 

 

 

 

 

 

SD

R104

3

 

6

 

1 OUT

+

U101

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

V1–

 

 

 

 

C101

 

R105

 

 

 

 

 

 

 

 

R106

 

 

 

 

 

 

1 FLT

 

 

C102

 

 

C103

 

 

 

 

 

 

R102 = R112 II R109,

 

 

 

 

 

or Short if Using Low Input

2

 

 

Bias Op Amp

 

 

 

6

 

 

 

 

 

 

 

 

 

3

+

5

 

 

 

 

 

 

1

Optional

R107

R101

100 k

5.6 k

V1–

Example Circuits

3-3

Page 21
Image 21
Texas Instruments SLOU061A manual Noninverting Amplifier, VREF1 +1.24 VR111R113R113

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