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AMP03BJ

High-Speed Differential Amplifier

Analog Devices 

AMP03

AMP03

E2

R

E1

OP80EJ

I0 = (E1 – E2)/R

I0 LOAD

Figure 8. Differential Input Voltage-to-Current Converter

for Low IOUT. OP80EJ maintains 250 fA max input current,

allowing IO to be less than 1 pA.

–IN E1

A1

R2

R1

R2

AMP03

E0 OUTPUT

A2

+IN E2

E0 = (1 + 2R2/R1) (E2 – E1)

Figure 9. Suitable Instrumentation Amplifier Requirements

Can Be Addressed by Using an Input Stage Consisting of A1,

A2, R1, and R2. The following matrix suggests a suitable

amplifier.

System Design

Requirement

Source Impedance Low, Need Low

Voltage Noise Performance

Suggested Op Amp

For A1 and A2

OP27, OP37

OP227 (Dual Matched)

OP270 (Dual)

OP271

OP470

OP471

Source Impedance High

(RS ≥ 15 kΩ). Need Low Current

Noise

OP80

OP41

OP43

OP249

OP97

Require Ultrahigh Input Impedance

OP80

OP97

OP41

OP43

Need Wider Bandwidth and High

Speed

OP42

OP43

OP249

REV. F

–7–

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