Patent ID: 7119623

Claim:
An output circuit for a semiconductor amplifier element having an output capacitance ( 20 , 42 ) that is to be cancelled out by a first LC circuit having a first inductance ( 22 , 44 ) and a first capacitance ( 24 , 46 ), said output circuit comprising an additional inductance circuit comprising an additional inductance ( 30 , 52 ) and an additional capacitance ( 32 , 54 ), said first inductance circuit and said additional inductance circuit compensating for the output capacitance ( 20 , 42 ) of the semiconductor amplifier element, while the first inductance ( 22 , 44 ) and the first capacitance ( 24 , 46 ) suppress the second harmonics within the output signal of the semiconductor amplifier element, wherein the additional inductance is connected to a node between the first inductance and the first capacitance.