Current measuring circuit including operational amplifier - is connected to voltage controlled current generator which has two additional operational amplifiers

摘要

The circuit is for the measurement of the current flowings through an element at a fixed potential. It comprises an operational amplifiers (Ao), one of whose inputs (+) is connected to the fixed potential (VA) while its second input (-) is connected to the element through which the current to be measured is flowing. A voltage-controlled current generator is connected so that it is opposed to the operational amplifier and so that the output voltage of the operational amplifier is proportional to the current provided by the current generator. This current generator comprises a second and a third operational amplifier (A1, A2).