Differential current buffer circuit and dc and alternating current source comprising the same

Differential current buffer circuit (100) comprising a differential input stage (300) that is powered from a first positive supply voltage (+V1) and a first negative supply voltage (−V1), wherein the differential input stage (300) has a first input circuit whose outputs are connected between a first current path (318) of a first output current mirror connected to a second positive supply voltage (+V2) and a first current path (322) of a second mirror connected to a second negative supply voltage (−V2), and a second input circuit whose outputs are connected between a first current path (310) of a third output current mirror connected to the second positive supply voltage (+V2) and a first current path (314) of a fourth output current mirror connected to the second negative supply voltage (−V2), wherein, referred to a reference potential, the second positive supply voltage (+V2) is higher than the first positive supply voltage (+V1) and the second negative supply voltage (−V2) is lower than the first negative supply voltage (−V1), and wherein a first output (O1) of the differential current buffer circuit (100) is tapped off between the respective second current paths (320, 324) of the first and second output current mirrors, and wherein a second output (O2) of the differential current buffer circuit (100) is tapped off between the respective second current paths (312, 316) of the third and fourth output current mirrors.