LPC660

SNOS554D – MAY 1998 – REVISED MARCH 2013

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Figure 29. (a) Inverting Amplifier

Figure 30. (b) Non-Inverting Amplifier

Figure 31. (c) Follower

Figure 32. (d) Howland Current Pump

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.

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