®

INA131

10

INA131

V

O

+10V

Bridge

Ref

INA131

I

B

R

V

IN

–

+

A

1

I

O

Load

I

O =

100 • V

IN

R

Ref

A1

IB Error

OPA177

±1.5nA

OPA602

1pA

OPA128

75fA

FIGURE 9. Differential Voltage to Current Converter.

FIGURE 7. Bridge Transducer Amplifier.

INA131

V

O

C

1

0.1µF

OPA602

Ref

R

1

1M

Ω

f

–3dB =

1

2

πR

1C1

= 1.59Hz

V

IN

+

–

FIGURE 8. AC-Coupled Instrumentation Amplifier.