hello forum! i am trying to design, a bias circuit for an application. the circuit i am using this far is like that:
where, REF102 is a precicion voltage reference of 10v and ina 105 is a differential OP-amp. those components, are fixed, and are the becouse of their low noise... (i will be dialling with pA currents...) i will be using this, to bias a photoCell... i have to be able to bias it from -10v , up to +10v.
0 to 10v, is easy, with a potentiometer.. but what about -10v, to 10v?? how would i go, doint it without the use of a switch?? any advice is welcome!!
where, REF102 is a precicion voltage reference of 10v and ina 105 is a differential OP-amp. those components, are fixed, and are the becouse of their low noise... (i will be dialling with pA currents...) i will be using this, to bias a photoCell... i have to be able to bias it from -10v , up to +10v.
0 to 10v, is easy, with a potentiometer.. but what about -10v, to 10v?? how would i go, doint it without the use of a switch?? any advice is welcome!!