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LMC660CN Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LMC660CN Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 14 page Application Hints (Continued) cause only 0.05 pA of leakage current, or perhaps a minor (2:1) degradation of the amplifier’s performance. See Figure 6a,Figure 6b, Figure 6c for typical connections of guard rings for standard op amp configurations. If both inputs are active and at high impedance, the guard can be tied to ground and still provide some protection; see Figure 6d. 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 con- struction, but the advantages are sometimes well worth the effort of using point-to-point up-in-the-air wiring. See Figure 7. 00876716 FIGURE 5. Example, using the LMC660, of Guard Ring in P.C. Board Layout 00876717 (a) Inverting Amplifier 00876718 (b) Non-Inverting Amplifier 00876719 (c) Follower 00876720 (d) Howland Current Pump FIGURE 6. Guard Ring Connections www.national.com 9 |
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