METHOD FOR ADJUSTING OP-AMP IC OUTPUT CURRENT AFTER ASSEMBLY
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2001-Nov-01
In applications using operational amplifiers it is sometimes desirable to be able to program the output drive capability of the device after it is assembled into a package, or perhaps even after insertion into an operating circuit. This need is of particular importance with devices using a PNP current source as the pull-up element, since with these the supply current is largely determined by the output drive current. The main reason such current consuming output stages are used is that they allow the output pin to rise almost to the positive supply rail and are able to provide this function for less current overall, than a resistive pull-up.