# US 9,882,551 B2 · Frequency multiplier > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,551 B2 - Document ID: US9882551B2 - Status: Granted - Kind: B2 - Application number: 15/231,053 - Filed: 2016-08-08 - Published: 2017-05-25 - Granted: 2018-01-30 - Earliest claimed: 2015-11-19 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Hitoshi Kurusu; Takumi Sugitani - Web page: https://patentgrep.com/patent/US9882551B2 ## CPC - H03K 5/00006: {Changing the frequency (modulating pulses H03K7/00; frequency dividers H03K21/00 - H03K29/00; additive or subtractive mixing of two pulse rates into one G06F7/605; pulse rate dividers G06F7/68)} - H03H 11/30: Automatic matching of source impedance to load impedance - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) ## Abstract A frequency includes 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, and 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. ## Claims ### Claim 1 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 filter circuit for inhibiting entry of a radiofrequency signal, the filter circuit being provided between the first diode and the branch point, the filter circuit including a transmission line which is of ¼ wavelength with respect to the output frequency, and a first capacitor for grounding the branch line between the transmission line and the first diode. ### Claim 2 (depends on 1) The frequency multiplier according to claim 1, wherein the first diode is a junction transistor having its source and drain connected to each other. ### Claim 3 (depends on 1) The frequency multiplier according to claim 1, wherein the first diode is a bipolar transistor having its base and collector connected to each other. ### Claim 4 (depends on 1) The frequency multiplier according to claim 1, wherein the gate terminal receives input of a signal including the first frequency through an input matching circuit. ### Claim 5 (depends on 1) The frequency multiplier according to claim 1, wherein the filter circuit includes an inductor. ### Claim 6 (depends on 1) The frequency multiplier according to claim 1, wherein the filter circuit includes a first resistor. ### Claim 7 (depends on 1) The frequency multiplier according to claim 1, further comprising 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. ### Claim 8 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. ### Claim 9 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. ### Claim 10 (depends on 9) The frequency multiplier according to claim 9, wherein the second diode is a junction transistor having its source and drain connected to each other. ### Claim 11 (depends on 9) The frequency multiplier according to claim 9, wherein the second diode is a bipolar transistor having its base and collector connected to each other.