![]() ![]() Distortion always gets worse as the loading increases. The no-load plot is indistinguishable from that of the testgear alone. No output load except for the feedback resistor. Output level 3 Vrms, gain 3.23×, rails ☑5 V. Shunt-feedback configuration eliminates CM input distortion. At heavier loadings the difference is barely visible because most of the distortion is coming from the output stage.įigure 4.32: Distortion versus loading for the TL072, with various loads. In particular compare the results for 3k3 load in Figures 4.32 and 4.33. 100 nF) per few centimeters is usually sufficient to deal with this, but normal practice is to not take chances, and allow one capacitor per package as with other op-amps.īecause of common-mode distortion, a TL072 in shunt configuration is always more linear. One or two rail-to-rail decoupling capacitors (e.g. TL072s are relatively relaxed about supply-rail decoupling, though they will sometimes show very visible oscillation if they are at the end of long thin supply tracks. There may be really horrible clipping, where the output hits the bottom rail and then shoots up to hit the top one, or the stage may simply latch up until the power is turned off. If the common-mode voltage gets to within a couple of volts of the V- rail, the op-amp suffers phase reversal and the inputs swap their polarities. ![]() It is a quirk of this device that the input common-mode range does not extend all the way between the rails. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |