Precision High Frequency Phase Adders

An electronic circuit comprising:

• a differential multiplier circuit with a differential output having a first output line and a second output line;
• and
• a first feedback circuit with a differential input having a first input line and a second input line and having an output,
• the differential multiplier circuit comprising:
• a first triode interface circuit including a transistor that during operation is biased to operate in a triode region and having a load side and a bias current side;
• a second triode interface circuit including a transistor that during operation is biased to operate in a triode region and having a load side and a bias current side, wherein the first and second triode interface circuits are electrically connected together;
• a differential load circuit electrically connected to the load sides of the first and second triode interface circuits;
• and
• a bias current source unit electrically connected to the bias current sides of the first and second triode interface circuits;
• wherein the first input line of the first feedback circuit is for receiving a bias voltage, the second input line of the first feedback circuit is electrically connected to the first output line of the differential multiplier circuit, and the output of the first feedback circuit is electrically connected to the differential multiplier circuit.

An electronic circuit comprising:

• a differential multiplier circuit;
• a differential mixer circuit;
• and
• a current source section for providing bias currents to the differential multiplier circuit and the differential mixer circuit,
• wherein the differential multiplier circuit and the differential mixer circuit are electrically stacked together so that the bias currents that are provided to the differential multiplier circuit by the current source section also serve as bias currents for the differential mixer circuit.