Transistor amplifier providing improved linear and return loss performance characteristics

A transistor amplifier for coupling between a sending circuit having a source voltage at a predetermined frequency and a source resistance and a receiving circuit having a load resistance, the transistor amplifier comprising:

• a transistor having a base, a collector and an emitter, the base having an input impedance and the collector having an output impedance;
• a dual loop feedback control circuit for converting the input impedance to a conjugate of the source resistance and the output impedance to an optimum load impedance, the optimum load impedance equals the collector emitter voltage divided by the collector current, the dual loop feedback control circuit comprising a shunt feedback resistor electrically coupled between the collector and the base and a series feedback resistor electrically coupled between the emitter and a ground potential;
• and
• impedance matching circuit for converting the load resistance to a conjugate of the output impedance and the output impedance from the optimum load to a conjugate of the load resistance at the predetermined frequency, the impedance matching circuit electrically coupled between the collector and the receiving circuit.