Patent ID: 7427854

Claim:
A current regulator circuit comprising: a first circuit node ( 32 ) which is operable to receive an external input voltage; a transistor (M 1 ) having an input, a first leg and a second leg, the first leg of the transistor being isolated from the first circuit node ( 32 ); an amplifier ( 10 ) having an output connected to the input of the transistor, a first amplifier input for receiving a reference voltage (V REF ) and a second amplifier input connected to the first circuit node ( 32 ); a low-pass filter ( 33 ) connected between the output of the amplifier and the first circuit node ( 32 ); a current mirror ( 36 ) connected in series with the second leg of the transistor (M 1 ) and having a first branch ( 38 ) for providing a regulated output current and a second branch ( 37 ) which connects to the first circuit node ( 32 ), wherein the first branch ( 38 ) is directly or indirectly coupled to an output stage ( 40 ), which comprises a further current mirror, wherein the further current mirror is an EMI-filtering current mirror.