Patent ID: 7737787

Claim:
An amplifier circuit comprising: a transistor element having an input terminal supplied with an input signal that is to be amplified, an output terminal at which the amplified input signal is emitted as an output signal, and a third terminal; a first reactance connecting said input terminal with said output terminal; a second reactance connecting said third terminal to a zero potential; one of said first reactance and said second reactance being an inductor and the other of said first reactance and said second reactance being a capacitor; and said inductor having an inductance value and said capacitor having a capacitance value dimensioned to make a quotient of the inductance value and the capacitance value equal to the product of a desired input impedance effective at the input terminal and an output impedance associated with the output terminal, causing said output impedance associated with the output terminal to be mapped to the input terminal at the same level or at a scaled level.