LMC6024 Datasheet, PDF (11/22 Pages) National Semiconductor (TI) – Low Power CMOS Quad Operational Amplifier

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Guard Ring Connections
LMC6024
SNOS621D – AUGUST 2000 – REVISED MARCH 2013
Figure 29. Inverting Amplifier Guard Ring
Connections
Figure 30. Non-Inverting Amplifier Guard Ring
Connections
Figure 31. Follower Guard Ring Connections
Figure 32. Howland Current Pump Guard Ring
Connections
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 33.
(Input pins are lifted out of PC board and soldered directly to components. All other pins connected to PC board.)
Figure 33. Air Wiring
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