Accurate constant current generator

摘要

The present invention relates to a constant current generator including a reference voltage source providing a constant voltage with respect to a first ground; an operational amplifier receiving the constant voltage on a non-inverting input; and a follower transistor controlled by the output of the operational amplifier and connected between an input of a current mirror and a first resistor connected to the first ground. It further includes a second resistor connected between an output of the current mirror and a second ground, the output of the current mirror being also coupled to an inverting input of the operational amplifier; and a filtering circuit connected to reduce or eliminate, in the output signal of the operational amplifier, any high frequency ac component with respect to the first ground.