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LMC660 Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMC660
Description  CMOS Quad Operational Amplifier
Download  12 Pages
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

LMC660 Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Application Hints (Continued)
The designer should be aware that when it is inappropriate
to lay out a PC board for the sake of just a few circuits, there
is another technique which is even better than a guard ring
on a PC board: Don’t insert the amplifier’s input pin into the
board at all, but bend it up in the air and use only air as an in-
sulator. Air is an excellent insulator. In this case you may
have to forego some of the advantages of PC board con-
struction, but the advantages are sometimes well worth the
effort of using point-to-point up-in-the-air wiring. See
The test method of
Figure 8 is appropriate for bench-testing
bias current with reasonable accuracy. To understand its op-
eration, first close switch S2 momentarily. When S2 is
opened, then
A suitable capacitor for C2 would bea5pFor10pF silver
mica, NPO ceramic, or air-dielectric. When determining the
magnitude of I
b−, the leakage of the capacitor and socket
must be taken into account. Switch S2 should be left shorted
most of the time, or else the dielectric absorption of the ca-
pacitor C2 could cause errors.
Similarly, if S1 is shorted momentarily (while leaving S2
where C
x is the stray capacitance at the + input.
(a) Inverting Amplifier
(b) Non-Inverting Amplifier
(c) Follower
(d) Howland Current Pump
FIGURE 6. Guard Ring Connections
(Input pins are lifted out of PC board and soldered directly to components.
All other pins connected to PC board.)
FIGURE 7. Air Wiring
FIGURE 8. Simple Input Bias Current Test Circuit

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