# US 12,763,799 B2 · Circuits for filtering radio-frequency signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,763,799 B2 - Document ID: US12763799B2 - Status: Granted - Kind: B2 - Application number: 17/982,273 - Filed: 2022-11-07 - Published: 2023-05-11 - Granted: 2026-10-13 - Earliest claimed: 2021-11-08 - Assignees: Skyworks Solutions, Inc. - Applicants: Skyworks Solutions, Inc. - Inventors: David Richard Pehlke - Web page: https://patentgrep.com/patent/US12763799B2 ## CPC - H04B 1/0057: {using diplexing or multiplexing filters for selecting the desired band} - H04B: TRANSMISSION ## Abstract Embodiments of the invention relate to a switching circuit that includes a first signal path for a first frequency range, a second signal path for a second frequency range, and one or more switches. Each of the first and second signal paths may include one or more filters configured to pass a respective region of the first or second frequency ranges. The one or more switches are configured to select one or more signal path filters based on a control signal. Related methods for filtering a radio-frequency signal, radio-frequency modules and wireless devices are also provided. ## Claims ### Claim 1 A radio-frequency switching circuit, comprising: a first signal path for a first frequency range; a second signal path for a second frequency range, the first and second frequency ranges being adjacent to each other; first signal path filters each configured to pass a respective region of the first frequency range, the first signal path filters including a first filter and a second filter, the respective region of the first filter including a first band and a second band that are separate from each other in frequency, the respective region of the second filter including a sub-band of the first band and a sub-band of the second band such that the second filter has a reduced bandwidth relative to the first filter; second signal path filters each configured to pass a respective region of the second frequency range, the respective regions being smaller than the second frequency range and being between the first band and the second band, the second signal path filters including a third filter and a fourth filter, the respective region of the third filter having a larger gap in frequency offset from the first band than the fourth filter, and the respective region of the fourth filter having a larger gap in frequency offset from the second band than the third filter; and one or more switches configured to select one of the first signal path filters and one of the second signal path filters based on a control signal, and to connect the selected one of the first signal path filters with the selected one of the second signal path filters. ### Claim 2 (depends on 1) The radio-frequency switching circuit of claim 1 wherein the first band and the second band are used for cellular communication, and the second frequency range includes a frequency band used for wireless local area network signal communication. ### Claim 3 (depends on 1) The radio-frequency switching circuit of claim 1 wherein the first frequency range is separated from the second frequency range by a frequency gap that is smaller than or equal to approximately 15 MHz. ### Claim 4 (depends on 1) The radio-frequency switching circuit of claim 1 wherein the region of the first frequency range corresponding to the selected first signal path filter is separated from the second frequency range by a frequency gap that is greater than or equal to 20 MHz. ### Claim 5 (depends on 1) The radio-frequency switching circuit of claim 1 wherein the region of the second frequency range corresponding to the selected second signal path filter is separated from the first frequency range by a frequency gap that is greater than or equal to 20 MHz. ### Claim 6 (depends on 1) The radio-frequency switching circuit of claim 1 further comprising a low pass filter, the one or more switches configured to connect the selected one of the first signal path filters and the selected one of the second signal path filters to the low pass filter. ### Claim 7 (depends on 1) A radio-frequency module comprising: a packaging substrate configured to receive a plurality of components; and a semiconductor die implemented on the packaging substrate, the semiconductor die including the radio-frequency switching circuit of claim 1. ### Claim 8 (depends on 7) A wireless device including the radio-frequency module of claim 7 the wireless device further including antennas, an antenna switch module coupled between the one or more switches and the antennas, and a controller configured to provide a control signal to the radio-frequency switching circuit of the radio-frequency module. ### Claim 9 (depends on 1) The radio-frequency switching circuit of claim 1 wherein one or more switches are configured to disconnect all of the first signal path filters from the selected one of the second signal path filters when the first signal path is inactive. ### Claim 10 (depends on 1) The radio-frequency switching circuit of claim 1 wherein the one or more switches are configured to disconnect all of the second signal path filters from the selected one of the first signal path filters when the second signal path is inactive. ### Claim 11 (depends on 1) The radio-frequency switching circuit of claim 1 wherein the second frequency range corresponds to a Wi-Fi band. ### Claim 12 A radio-frequency switching circuit for multiple signal bands, comprising: a first signal path for a first frequency range; a second signal path for a second frequency range, the first and second frequency ranges being adjacent to each other; first signal path filters including a first filter and a second filter, the first filter configured to pass a first band and a second band within the first frequency range, and the second filter configured to pass a sub-band of the first band and a sub-band of the second band such that the second filter has a reduced bandwidth relative to the first filter; a second signal path filter configured to pass a region of the second frequency range that is between the first band and the second band, the region having a larger gap in frequency offset from the sub-band of the first band than the first band, and having a larger gap in frequency offset from the sub-band of the second band than the second band; and one or more switches configured to select one of the first signal path filters based on a control signal and to connect the selected one of the first signal path filters to the second signal path filter. ### Claim 13 (depends on 12) The radio-frequency switching circuit of claim 12 wherein the first band and the second band are cellular bands. ### Claim 14 (depends on 13) The radio-frequency switching circuit of claim 13 wherein the second frequency range corresponds to a Wi-Fi band. ### Claim 15 (depends on 12) The radio-frequency switching circuit of claim 12 wherein the one or more switches are configured to disconnect all of the first signal path filters from the second signal path filter when the first signal path is inactive. ### Claim 16 (depends on 12) The radio-frequency switching circuit of claim 12 wherein the first frequency range is separated from the second frequency range by a frequency gap that is smaller than or equal to 15 MHz. ### Claim 17 (depends on 16) The radio-frequency switching circuit of claim 16 wherein the region of the second frequency range is separated from the sub-band of the first band by at least 20 MHz. ### Claim 18 (depends on 12) The radio-frequency switching circuit of claim 12 further comprising a low pass filter, the one or more switches configured to connect the selected one of the first signal path filters to the low pass filter. ### Claim 19 A radio-frequency module comprising: a packaging substrate configured to receive a plurality of components; and a semiconductor die implemented on the packaging substrate, the semiconductor die including a radio-frequency switching circuit, the radio-frequency switching circuit including a first signal path for a first frequency range; a second signal path for a second frequency range, the first and second frequency ranges being adjacent to each other; first signal path filters including a first filter and a second filter, the first filter configured to pass a first band and a second band within the first frequency range, and the second filter configured to pass a sub-band of the first band and a sub-band of the second band such that the second filter has a reduced bandwidth relative to the first filter; a second signal path filter configured to pass a region of the second frequency range that is between the first band and the second band, the region having a larger gap in frequency offset from the sub-band of the first band than the first band, and having a larger gap in frequency offset from the sub-band of the second band than the second band; and one or more switches configured to select one of the first signal path filters based on a control signal and to connect the selected one of the first signal path filters to the second signal path filter. ### Claim 20 (depends on 19) A wireless device comprising the radio-frequency module of claim 19, antennas, an antenna switch module coupled between the one or more switches and the antennas, and a controller configured to provide a control signal to the radio-frequency switching circuit of the radio-frequency module.