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Offset Voltage

+

–

V

IO

R

G

R

S

R

F

I

IB–

V

OS

I

IB+

+

–

S0280-01

(

)

RF

V

V

I

R

1

I

R

OS

IO

IB

S

IB

F

RG

æ

ö

= ±

±

´

+

±

´

ç

÷

+

-

ç

÷

è

ø

General Configurations

V

I

V

O

C1

+

–

R

G

R

F

R1

S0281-01

3dB

1

f

2 R1C1

-

=

p

O

F

I

G

V

R

1

1

V

R

1

sR1C1

æ

öæ

ö

=

+

ç

֍

÷

ç

÷

+

è

ø

è

ø

THS4021

THS4022

SLOS265C – SEPTEMBER 1999 – REVISED JULY 2007

the corresponding gains. The schematic and formula of Figure 35 can be used to calculate the output offset

voltage.

Figure 35. Output Offset Voltage Model

When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often required.

The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the amplifier (see

Figure 36).

Figure 36. Single-Pole Low-Pass Filter

Copyright © 1999–2007, Texas Instruments Incorporated

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