current source 12 is coupled to supply i ref to the output terminal the transconductance of the op amp is controlled by line 13 which is connected to the output terminal to create a feedback loop this will result in making i ref i out for this condition g m i ref v ref control line 13 can be coupled directly to op amps 14 and 15 along with any others not shown so that programmed op amp 10 can be used to slave the transconductances of a plurality of other op amps such an arrangement is particularly useful in cmos devices where substantial parameter variations are encountered in a production process the schematic diagram of fig2 shows a circuit that includes a programmed op amp 10 a v cc power supply is coupled to terminal 17 and to ground terminal 18 device 19 which is conventional provides a source of v cc 2 voltage for setting the circuit operating point as a function of the supply voltage transistors 20 and 21 are connected as a differential pair with transistors 23 and 24 providing a current mirror output load node 25 constitutes the op amp output the gate of transistor.