Integrated limiter and active filter

A method of providing an integrated active filtering and current limiting for electrical power provided via a transistor, the method comprising:

• comparing a representation of an amount of current flow through the transistor with a first reference signal;
• comparing a representation of an output voltage associated with the transistor with a second reference signal;
• and
• controlling the transistor responsive to said comparison with the first reference signal and said comparison with the second reference signal such that said current flow representation does not exceed said first reference signal and said output voltage representation does not exceed said second reference signal.

An integrated limiter and active filter comprising:

• an input node;
• an output node;
• a transistor coupled between said input node and said output node;
• a first control means coupled to a control terminal of said transistor, said first control means arranged to limit an amount of current flowing through said output node to a first predetermined value, the first predetermined value responsive to a first reference signal;
• a second control means coupled to the control terminal of said transistor, said second control means arranged to limit the voltage appearing at said output node to a second predetermined value, the second predetermined value responsive to a second reference signal;
• and
• a third control means coupled to said input node and arranged to provide said second reference signal, said second reference signal responsive to the input voltage and to a predetermined maximum allowed output voltage.