1. A high-frequency current source for an active EMI filter comprising a output provided by an output network with two bipolar transistor in a symmetric common-emitter configuration connected between a upper supply rail with a first potential and a lower supply rail with a second potential, an active bias network determining the operating point of the two bipolar transistors, an analogue control network receiving the output and producing a DC correction signal that is fed to an error input of the active bias network to stabilize a DC value of the output, and a HF input controlling a high-frequency output current, wherein the analogue control network is configured to maintain the DC value of the output in a predetermined interval in the middle of a potential difference between the first and the second potential, wherein the analogue control network comprises a gain stage and an integrator stage in a low-pass filter configuration, and the active bias network comprises a voltage reference providing a constant voltage and a temperature-sensitive element introducing a temperature-dependent change in the base voltages of the transistors in the output network such that the DC value of the output is stabilized.