Patent ID: 9559584
Date: 2017-01-31
CPC Classifications: G05F,H02M,H05B,Y02B

Claim:
1. An electric circuit of a switchable current source, comprising: an input current path with a controllable current source to feed a changeable current to the input current path; an output terminal to provide an output current; an output current path being connected to the output terminal; a regulator circuit having a first input terminal to apply a first input signal and a second input terminal to apply a second input signal and an output terminal to provide an output signal, wherein the regulator circuit is arranged to provide an output signal in dependence on a comparison of the first and second input signals; a controllable output driver being controlled in dependence on the output signal, wherein the controllable output driver is arranged to change the output current in dependence on the output signal; and a feedback path coupled between the output current path and the first input terminal, wherein the first input terminal of the regulator circuit is connectable to the input current path and the feedback path, wherein the second input terminal of the regulator circuit is connectable to the input current path, wherein the regulator circuit comprises a first amplifier and a second amplifier, wherein the first amplifier has an input side including the first and second input terminals and an output side to provide a comparing signal, the first amplifier being arranged to compare the first and second input signals of the regulator circuit and to provide the comparing signal in dependence on the comparison of the first and second input signals of the regulator circuit, and wherein the second amplifier has an input side to apply the comparing signal and an output side to provide the output signal.