# US 12,113,263 B2 · Antenna port termination in absence of power supply > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,263 B2 - Document ID: US12113263B2 - Status: Granted - Kind: B2 - Application number: 18/497,928 - Filed: 2023-10-30 - Published: 2024-04-25 - Granted: 2024-10-08 - Earliest claimed: 2020-01-23 - Assignees: pSemi Corporation - Applicants: pSemi Corporation - Inventors: Sivakumar Ganesan - Web page: https://patentgrep.com/patent/US12113263B2 ## CPC - H01P 1/24: Terminating devices - H01Q 1/50: Structural association of antennas with earthing switches, lead-in devices or lightning protectors - H03K 17/687: the devices being field-effect transistors - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - 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) ## Abstract Methods and devices to address antenna termination in absence of power supplies within an electronic circuit including a termination circuit and a switching circuit. The devices include regular NMOS devices that decouple the antenna from the switching circuit in absence of power supplies while the antenna is coupled to a terminating impedance having a desired impedance value through a native NMOS device. The antenna is coupled with the switching circuit via the regular NMOS device during powered conditions while the antenna is decoupled from the terminating impedance. ## Claims ### Claim 1 An electronic circuit comprising: a termination circuit including a first switch, the first switch selectively coupling an antenna to ground; a switching circuit; and a second switch coupling the antenna and the termination circuit to the switching circuit, wherein a threshold voltage of the first switch is less than a threshold voltage of the second switch. ### Claim 2 (depends on 1) The electronic circuit of claim 1, wherein the termination circuit further includes a termination impedance disposed in series with the first switch. ### Claim 3 (depends on 2) The electronic circuit of claim 2, wherein: in a powered condition, the antenna is connected to the switching circuit and disconnected from the termination impedance, and in an unpowered condition, the antenna is connected to the termination impedance and disconnected from the switching circuit. ### Claim 4 (depends on 3) The electronic circuit of claim 3, wherein the switching circuit comprises radio frequency (RF) switches. ### Claim 5 (depends on 4) The electronic circuit of claim 4, wherein: in the powered condition, the first switch is in an OFF state and the second switch is in an ON state, and in the unpowered condition, the first switch is in the ON state and the second switch is in the OFF state. ### Claim 6 (depends on 5) The electronic circuit of claim 5, wherein in the powered condition of the electronic circuit, the first switch receives a first supply voltage, and the second switch receives a second supply voltage different from the first supply voltage, and wherein in the unpowered condition of the electronic circuit, the first and the second switches receive zero bias voltages. ### Claim 7 (depends on 6) The electronic circuit of claim 6, wherein, in the powered condition of the electronic circuit, the first supply voltage is negative, and the second supply voltage is positive. ### Claim 8 (depends on 7) The electronic circuit of claim 7, wherein the first switch comprises a stack of two or more serially connected transistors. ### Claim 9 (depends on 8) The electronic circuit of claim 8, wherein the second switch comprises a stack of two more serially connected transistors. ### Claim 10 (depends on 7) The electronic circuit of claim 7, wherein the second circuit comprises a plurality of single-pole single-throw (SPST) switches. ### Claim 11 (depends on 10) The electronic circuit of claim 10, wherein each SPST switch of the plurality of SPST switches comprises a through switch and a shunt switch. ### Claim 12 (depends on 11) The electronic circuit of claim 11, wherein the though switch comprises a through switch stack comprising a plurality of native NMOS serially connected transistors. ### Claim 13 (depends on 12) The electronic circuit of claim 12, wherein the shunt switch comprises a shunt switch stack comprising a plurality of native NMOS serially connected transistors. ### Claim 14 (depends on 11) The electronic circuit of claim 11, wherein the through switch comprises a series connection of a first and a second through switch, both connected to the shunt switch. ### Claim 15 (depends on 14) The electronic circuit of claim 14, wherein each of the first and the second through switch and the shunt switch comprises a plurality of native NMOS serially connected transistors. ### Claim 16 (depends on 4) The electronic circuit of claim 4, wherein the first switch comprises one or more native NMOS transistors and the second switch comprises one or more regular NMOS transistors. ### Claim 17 A method of terminating an antenna comprising: providing a switching circuit including a plurality of switching transistors; coupling the antenna to ground through a first switch, the first switch having a first threshold voltage, and coupling the antenna to the switching circuit through a second switch, the second switch having a second threshold voltage being greater than the first threshold voltage. ### Claim 18 (depends on 17) The method of claim 17, wherein the antenna is coupled to ground through a termination impedance. ### Claim 19 (depends on 18) The method of claim 18, further comprising in a powered condition, turning the first switch to an OFF state, and the second switch to an ON state, and in an unpowered condition, turning the first switch to an ON state, and the second switch to an OFF state.