Yes, unless you want to further minimize the offset voltage. This trimming is optional, you can entirely neglect the trimming parts if you do not want to trim the offset voltage.


This results in a noise gain of 1.5, which is below the required gain of 5, so your design is prone to oscillate!!!

Nearly all OPamps are internally compensated to guarantee a stable performance. Internal compensation means the introduce of an internal first order lowpass filter to give the open loop gain a slope of 20db decrease per decade. This also means the introduce of an internal phase shift between input and output of 90° as it is well known from a first order lowpass filter.

Only by this your OPamp will work at all. Now you can handle all gains without instability, provided that you do not introduce an additional phase lag by the feedback loop components of more than 60° for medium frequencies and 30° at unity gain bandwidth.

The disadvantage of an compensated OPamp, on the other hand, is, that you have less open loop gain and by this less loop gain than you could have without the compensation. So, if you have a high gain application you might not have enough loop gain to minimize distortion, drifts a.s.o. For this reason for high gain applications there's sometimes a sister (or brother) OPamp available, which is identical to the compensated OPamp, but which is partially decompensated (OP27/37, LF356/357, e.g.). This OPamp can be used in applications at gains higher than the specified minimum gain. But take care, at gains lower than the specified minimum gain the internal phase shift tends to 180° near unity gain bandwidth, making your design instable!

Take care, running a decompensated OPamp is always tricky, because the usually used external lowpass filter cap in the feedback loop can decrease the noise gain at the unity gain bandwidth again, resulting in a gain which is now lower than the minimum gain! Also, capacitive loads cannot be handled easily with such a decompensated OPamp.

Using a decompensated OPamp usually is something for an experienced professional, who can carry out a SPICE simulation of the whole design to guarantee stable performance.

Kai