Can op-amps be purchased with a selected offset voltage?
Not unless you plan to pay a premium price and order 100,000 units. Small scale special testing of this sort is very expensive. If you want parts with consistent offsets, you will have to screen them first. Our advice is to redesign your circuit to be less sensitive to offsets. This will also prevent trouble in the future if devices need to be replaced in the field, as they can throw in any “off-the-shelf” device, instead of a “selected” device. There are ways to add/force an external offset. Take a look at the fourth page of application note AN-31, “Op Amp Circuit Collection”, for some circuits for adjusting the offsets of various op-amp configurations.
