Frequency multiplier

A frequency multiplier comprising:

• an input terminal;
• an output terminal;
• a transistor having a gate terminal which receives input of a signal including a first frequency from the input terminal, a source terminal and a drain terminal connected to the output terminal by a main line;
• an output matching circuit provided in the main line, the output matching circuit shutting off the first frequency while allowing an output frequency multiplied from the first frequency to pass therethrough;
• a branch line including a power supply terminal for connection to a power supply, the branch line branching off from a branch point in the main line;
• a first diode provided in the branch line, the first diode having an anode connected to the power supply terminal and a cathode connected on the branch point side;
• and
• a self-bias circuit with which a voltage of the source terminal is adjusted, the self-bias circuit having a grounding terminal for grounding connected to the source terminal, wherein the self-bias circuit includes a second capacitor and a second resistor connected in parallel with each other.

A frequency multiplier comprising:

• an input terminal;
• an output terminal;
• a transistor having a gate terminal which receives input of a signal including a first frequency from the input terminal, a source terminal and a drain terminal connected to the output terminal by a main line;
• an output matching circuit provided in the main line, the output matching circuit shutting off the first frequency while allowing an output frequency multiplied from the first frequency to pass therethrough;
• a branch line including a power supply terminal for connection to a power supply, the branch line branching off from a branch point in the main line;
• a first diode provided in the branch line, the first diode having an anode connected to the power supply terminal and a cathode connected on the branch point side;
• and
• a self-bias circuit with which a voltage of the source terminal is adjusted, the self-bias circuit having a grounding terminal for grounding connected to the source terminal, wherein the self-bias circuit includes a second capacitor and a second diode connected in parallel with each other, and
• wherein the second diode has an anode connected to the source terminal and a cathode connected to the grounding terminal.