# US 2025/0096754 A1 · Transceiver interface with power detection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0096754 A1 - Document ID: US20250096754A1 - Status: Published application - Kind: A1 - Application number: 18/471,088 - Filed: 2023-09-20 - Published: 2025-03-20 - Earliest claimed: 2023-09-20 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Chuan WANG; Kai ZHAN; Bon-Hyun KU; Hyejeong SONG; Li LIU; Kevin Hsi-Huai WANG; Muhammad HASSAN - Web page: https://patentgrep.com/patent/US20250096754A1 ## CPC - H03F 3/245: {with semiconductor devices only} - H03F 3/62: Two-way amplifiers - H01F 27/2804: {Printed windings} - H03F 3/195: in integrated circuits - H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)} - H04B 1/40: Circuits - H04B 1/48: in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter {(H04B1/46 takes precedence)} - G01R 21/01: in circuits having distributed constants (G01R21/04, G01R21/07, G01R21/09, G01R21/12 take precedence) - H03F 2200/294: the amplifier being a low noise amplifier [LNA] - H03F 2200/451: the amplifier being a radio frequency amplifier - H03F 2200/534: Transformer coupled at the input of an amplifier - H03F 2200/537: A transformer being used as coupling element between two amplifying stages - H03F 2200/541: Transformer coupled at the output of an amplifier - H03H 7/383: {comprising distributed impedance elements together with lumped impedance elements} - H03F: AMPLIFIERS - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H04B: TRANSMISSION - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) ## Abstract An apparatus for wireless communications includes a power amplifier, a low-noise amplifier, a power detector, and a transformer. The transformer includes a first inductor coupled to an output of the power amplifier, and a second inductor coupled to an antenna, wherein the second inductor is magnetically coupled with the first inductor. The transformer also includes a third inductor coupled to an input of the low-noise amplifier, wherein the third inductor is magnetically coupled with the second inductor. The transformer also includes a coupling inductor coupled to an input of the power detector, wherein the coupling inductor is magnetically coupled with at least one of the first inductor and the second inductor. ## Claims ### Claim 1 An apparatus for wireless communications, comprising: a power amplifier; a low-noise amplifier; a power detector; and a transformer, wherein the transformer comprises: a first inductor coupled to an output of the power amplifier; a second inductor coupled to an antenna, wherein the second inductor is magnetically coupled with the first inductor; a third inductor coupled to an input of the low-noise amplifier, wherein the third inductor is magnetically coupled with the second inductor; and a coupling inductor coupled to an input of the power detector, wherein the coupling inductor is magnetically coupled with at least one of the first inductor and the second inductor. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the coupling inductor overlaps the first inductor or the second inductor. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the coupling inductor does not overlap the third inductor. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein: the first inductor includes a loop inductor; and a portion of the coupling inductor has a shape substantially matching a shape of a portion of the loop inductor. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the portion of the coupling inductor substantially overlaps the portion of the loop inductor. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein: the second inductor includes a loop inductor; and a portion of the coupling inductor has a shape substantially matching a shape of a portion of the loop inductor. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the portion of the coupling inductor substantially overlaps the portion of the loop inductor. ### Claim 8 (depends on 6) The apparatus of claim 6, wherein the third inductor is located within the loop inductor. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein: the first inductor includes a first loop inductor and a second loop inductor, wherein the second loop inductor is located within the first loop inductor; the coupling inductor includes a first planar inductor and a second planar inductor coupled in parallel; the first planar inductor overlaps a portion of the first loop inductor; and the second planar inductor overlaps a portion of the second loop inductor. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein: the first planar inductor has a shape substantially matching a shape of the portion of the first loop inductor; and the second planar inductor has a shape substantially matching a shape of the portion of the second loop inductor. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the first loop inductor and the second loop inductor are coupled in parallel. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the second inductor includes a third loop inductor between the first loop inductor and the second loop inductor. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the second inductor includes a fourth loop inductor within the second loop inductor. ### Claim 14 (depends on 1) The apparatus of claim 1, further comprising a directional circuit, wherein the coupling inductor is coupled between the directional circuit and the input of the power detector. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the directional circuit comprises a capacitor and a resistor coupled in parallel. ### Claim 16 (depends on 1) The apparatus of claim 1, further comprising a power controller coupled between an output of the power detector and the power amplifier, the power controller configured to adjust a power of the power amplifier based on the output of the power detector. ### Claim 17 (depends on 1) The apparatus of claim 1, further comprising an impedance matching circuit coupled between the second inductor and the antenna, the impedance matching circuit comprising: a first tunable capacitor coupled between a first terminal of the impedance matching circuit and a ground, wherein the first terminal is coupled the second inductor; a second tunable capacitor coupled between a second terminal of the impedance matching circuit and the ground, wherein the second terminal is coupled to the antenna; and an impedance matching inductor coupled between the first terminal and the second terminal. ### Claim 18 (depends on 1) The apparatus of claim 1, further comprising: a baseband processor; a first mixer coupled between an input of the power amplifier and the baseband processor; and a second mixer coupled between an output of the low-noise amplifier and the baseband processor. ### Claim 19 (depends on 18) The apparatus of claim 18, further comprising: a first intermediate frequency (IF) circuit coupled between the first mixer and the baseband processor; and a second IF circuit coupled between the second mixer and the baseband processor. ### Claim 20 (depends on 1) The apparatus of claim 1, wherein the antenna is one of multiple antennas in an antenna array. ### Claim 21 (depends on 1) The apparatus of claim 1, wherein the third inductor is coupled between the input of the low-noise amplifier and a ground. ### Claim 22 (depends on 1) The apparatus of claim 1, wherein the third inductor is coupled between the input of the low-noise amplifier and the antenna. ### Claim 23 (depends on 1) The apparatus of claim 1, wherein the apparatus includes the antenna. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the apparatus is a wireless device. ### Claim 25 (depends on 1) The apparatus of claim 1, wherein the output of the power amplifier includes a first output and a second output, and the first inductor is coupled between the first input and the second output. ### Claim 26 (depends on 1) The apparatus of claim 1, wherein the power detector is configured to measure an output power of the power amplifier. ### Claim 27 (depends on 1) The apparatus of claim 1, wherein: the power amplifier is configured to receive a first radio frequency (RF) signal at an input of the power amplifier, amplify the first RF signal, and output the amplified first RF signal at the output of the power amplifier; and the low-noise amplifier is configured to receive a second radio frequency (RF) signal at the input of the low-noise amplifier, amplify the second RF signal, and output the amplified second RF signal at an output of the low-noise amplifier. ### Claim 28 An apparatus for wireless communications, comprising: a power amplifier; a low-noise amplifier; a transformer, wherein the transformer comprises: a first inductor coupled to an output of the power amplifier; a second inductor magnetically coupled with the first inductor; and a third inductor coupled to an input of the low-noise amplifier, wherein the third inductor is magnetically coupled with the second inductor; an impedance matching circuit comprising an impedance matching inductor; a power detector; a first coupling inductor coupled between the second inductor and the impedance matching circuit; and a second coupling inductor coupled to an input of the power detector, wherein the second coupling inductor is magnetically coupled with the first coupling inductor. ### Claim 29 (depends on 28) The apparatus of claim 28, wherein the impedance matching circuit further comprises: a first tunable capacitor coupled between a first terminal of the impedance matching circuit and a ground, wherein the first terminal is coupled the second inductor; and a second tunable capacitor coupled between a second terminal of the impedance matching circuit and the ground, wherein the second terminal is coupled to an antenna, and the impedance matching inductor is between the first terminal and the second terminal. ### Claim 30 A method for wireless communications, comprising: amplifying a first radio frequency (RF) signal using a power amplifier; outputting the amplified first RF signal to a first inductor; coupling the amplified first RF signal to a second inductor via magnetic coupling between the first inductor and the second inductor; sensing the amplified first RF signal using a coupling inductor magnetically coupled with at least one of the first inductor and the second inductor; and measuring a power of the power amplifier based on the sensed amplified first RF signal.