ADWSystems
Member
Quick question. Let's say I configure an op amp for a non-inverting gain of 11. G=1+Rf/Rg so Rf=10xRg. What is the difference between selecting 1M and 100K versus 330K and 33K? Why would you choose one versus the other?
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Sometimes a tiny capacitance is generated by a "gimmick capacitor" consisting of two short insulated wires twisted together. The amount of capacitance can be adjusted to optimize the compensation by changing the length of the wires and/or the tightness of the twists..................................
The resistor values in the sim go from 1k/100 to 10k/1k to 100k/10k to 1Meg/100k as the peaking increases. Notice that the peaking never goes away entirely. This can be remedied by adding a cap across the feedback resistor, but the required value is so tiny that it is difficult to do.
Yes, that's what I was thinking. A true "trimmer" capacitor!Sometimes a tiny capacitance is generated by a "gimmick capacitor" consisting of two short insulated wires twisted together. The amount of capacitance can be adjusted to optimize the compensation by changing the length of the wires and/or the tightness of the twists.