Patent ID: 8368467

Claim:
An amplifier circuit for current amplification, comprising: an input stage adapted to receive an input signal; at least one current multiplication stage connected to the input stage, the current multiplication stage being adapted to receive a current signal from the input stage and produce a multiplied output current signal at an output of the amplifier circuit, wherein the current multiplication stage comprises at least two current multiplication circuits connected to each other, each current multiplication circuit being adapted to produce an output current signal essentially equal to the current signal from the input stage, such that the output current signal at an output of the amplifier circuit comprises a sum of the current signals received at each current multiplication circuit, and wherein the at least two current multiplication circuits, each comprising a first and a second transistor having their base terminals connected to each other, the first transistor adapted to receive an input signal current at its emitter terminal and to output an output current essentially identical but with reversed polarity to the input signal current on the collector terminal of the first transistor and the emitter terminal of the second transistor, the current multiplication circuit adapted to fulfil a function of the current multiplication stage in the amplifier circuit.