p channel mosfet 25 and output reference mirror section 24 is biased to reference bias voltage source 71 via the source terminal of first output p channel mosfet 27 source current 51 is mirrored as a reference current 53 at the drain terminal of second output p channel mosfet 29 when a reference signal mosfet switch 61 is closed direct output current mirror 30 comprises a first output signal p channel mosfet 31 and a second output signal p channel mosfet 33 incoming current is provided to both the drain and the gate terminals of first output signal p channel mosfet 31 and also to the gate terminal of second output signal p channel mosfet 33 when an output signal mosfet switch 63 is closed direct output current mirror 30 is biased by means of an output signal bias voltage 73 v dd which is applied to both the source terminal of first output signal p channel mosfet 31 and the source terminal of second output signal p channel mosfet 33 an output signal load 67 receives output current signal 57 from image sensing device 100 so as to provide an output voltage signal 77 v out relative to a ground rail voltage 81 v ss as shown in a preferred embodiment v dd is approximately 5 0 volt.