System and method for a frequency doubler

A semiconductor circuit comprising:

• an input stage comprising a first transistor and a second transistor, wherein bases of the first transistor and the second transistor are coupled to an input port, and an emitter of the first transistor is coupled to an emitter of the second transistor;
• a cascode stage comprising a third transistor and a fourth transistor;
• a first transmission line element coupled between a collector of the first transistor and an emitter of the third transistor;
• a second transmission line element coupled between a collector of the second transistor and an emitter of the fourth transistor;
• and
• an output stage having a first input coupled to a collector of the third transistor, a second input coupled to a collector of the fourth transistor, and an output coupled to an output port.

A method of doubling a frequency, the method comprising:

• providing a first signal having a first frequency to an input port of a frequency doubling circuit comprising
• a differential transistor pair coupled to an input port of the frequency doubling circuit,
• a differential cascode stage having an input coupled to an output of the differential transistor pair,
• a plurality of first transmission line elements coupled between the output of the differential transistor pair and the input of the differential cascode stage, and
• an output combining network coupled between the differential cascode stage and an output port of the frequency doubling;
• and
• receiving a second signal from the output port of the frequency doubling circuit, the second signal having a second frequency that is twice the first frequency.