LMC6061_14 Datasheet, PDF (12/21 Pages) National Semiconductor (TI) – PRECISION CMOS SINGLE MICROPOWER OPERATIONAL AMPLIFIER

LMC6061
SNOS648D – NOVEMBER 1994 – REVISED MARCH 2013
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Figure 27. Example of Guard Ring in P.C. Board Layout
Inverting Amplifier
Non-Inverting Amplifier
Follower
Figure 28. Typical Connections of Guard Rings
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 insulator. Air is an
excellent insulator. In this case you may have to forego some of the advantages of PC board construction, but
the advantages are sometimes well worth the effort of using point-to-point up-in-the-air wiring. See Figure 29.
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