1

1.5

2

2.5

3

10n

100n

1

10

100

1m

10m

m

m

m

Input Current (A)

Uncompensated Output

Compensated Output

Verifying Results

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5

Verifying Results

Making measurements on the LOG114EVM is fast and easy. Connect a digital voltmeter or oscilloscope to

the terminal of interest and record the results. Included with the graph of measured results is a table of

results for common values of input currents. In Figure 13, two curves are shown. Both curves use a

resistor input and V

the resistor as shown in Figure 11 and uses the high-current linearity correction circuitry. The

uncompensated curve (blue) uses the resistor connected to I

Figure 13. LOG114EVM Measured Results

Table 1 lists several typical results obtained with various input voltages.

Table 1. LOG114EVM Typical Results

Uncompensated

Compensated

Input

V

V

V

V

10 nA

1.36

1.15

1.36

1.15

100 nA

1.74

1.38

1.74

1.38

1

μA

2.11

1.60

2.11

1.60

10

μA

2.49

1.83

2.49

1.83

100

μA

2.87

2.06

2.87

2.06

1 mA

3.29

2.31

3.29

2.30

10 mA

4.11

2.82

4.11

2.67

12

LOG114EVM User Guide

SBOU110

– September 2011

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