lmc662c-mdc National Semiconductor Corporation, lmc662c-mdc Datasheet - Page 10

• Manufacturer Part Number: lmc662c-mdc
• Description: Cmos Dual Operational Amplifier
• Manufacturer: National Semiconductor Corporation

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Application Hints
BIAS CURRENT TESTING
The test method of Figure 11 is appropriate for bench-testing
bias current with reasonable accuracy. To understand its
operation, first close switch S2 momentarily. When S2 is
opened, then
FIGURE 11. Simple Input Bias Current Test Circuit
(Continued)
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A suitable capacitor for C2 would be a 5 pF or 10 pF silver
mica, NPO ceramic, or air-dielectric. When determining the
magnitude of I
must be taken into account. Switch S2 should be left shorted
most of the time, or else the dielectric absorption of the
capacitor C2 could cause errors.
Similarly, if S1 is shorted momentarily (while leaving S2
shorted)
where C
x
is the stray capacitance at the + input.
b
−, the leakage of the capacitor and socket