Systems for amplifying a signal using a transformer matched transistor

A circuit for amplifying a source signal generated by a signal source having a first impedance, said circuit comprising:

• a transmission line transformer (TLT) having a first, a second, a third, and a fourth port, said TLT coupled to receive the source signal at the first port and configured to output a corresponding impedance matched signal at the first port, wherein the second port of said TLT is coupled to the third port of said TLT;
• a TLT load including one or more resistors and one or more capacitors, and having a first terminal coupled to the second port of said TLT and a second terminal coupled to a reference potential, wherein a first terminal of a first one of the resistors is coupled to the first terminal of said TLT load, a first terminal of a first one of the capacitors is coupled to a second terminal of the first one of the resistors, and a second terminal of the first one of the capacitors is coupled to the second terminal of said TLT load;
• a capacitor coupled to the fourth port of said TLT;
• and
• an amplifier device responsive to the impedance matched signal to generate an amplified signal, said amplifier device having a second impedance,
• wherein said TLT matches the first impedance of said signal source with the second impedance of said amplifier device such that the impedance matched signal and the source signal are substantially equal in magnitude.

A circuit comprising:

• a transmission line transformer (TLT) having a first, a second, a third, and a fourth port, with the second port coupled to the third port;
• a TLT load having a first terminal coupled to the fourth port of said TLT and a second terminal coupled to a reference potential, said TLT load comprising a resistor and capacitor coupled in series;
• and
• an amplifier device coupled to the second port of said TLT, said amplifier device having an impedance different than an impedance at the first port of said TLT.