# US 2014/0194075 A1 · Variable antenna match linearity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194075 A1 - Document ID: US20140194075A1 - Status: Published application - Kind: A1 - Application number: 13/738,087 - Filed: 2013-01-10 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Motorola Mobility LLC - Applicants: Motorola Mobility LLC - Inventors: Gregory R. Black; John P. Boos - Web page: https://patentgrep.com/patent/US20140194075A1 ## CPC - H04B 1/40: Circuits - H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)} - H04B 1/406: {with more than one transmission mode, e.g. analog and digital modes} - H04B 1/525: with means for reducing leakage of transmitter signal into the receiver - H04B: TRANSMISSION ## Abstract In embodiments of variable antenna match linearity, a wireless device includes a first transceiver and a second transceiver, an antenna via which signals are received, and a linearity controller that varies a linearity of an antenna match circuit associated with the antenna. The linearity controller can determine whether a frequency of an intermodulated signal that includes transmissions from the first and second transceivers is within one of a respective receive band of the first transceiver or the second transceiver. The linearity controller can increase a linearity of the antenna match circuit to mitigate an amplitude of the intermodulated signal in the receive band. ## Claims ### Claim 1 A method implemented in a multi-transceiver wireless device, the method comprising: determining respective operational modes of a first transceiver and a second transceiver of the wireless device; and: applying a first level of bias current to a PIN diode of an antenna match circuit when determined that the first and the second transceivers are each in respective transmission modes, the antenna match circuit associated with an antenna via which one of the first transceiver or the second transceiver receives signals; applying a second level of bias current to the PIN diode of the antenna match circuit when determined that the first transceiver is in the respective transmission mode and the second transceiver is in a respective non-transmission mode; or applying a third level of bias current to the PIN diode of the antenna match circuit when determined that the first transceiver is in a respective non-transmission mode and the second transceiver is in the respective transmission mode. ### Claim 2 (depends on 1) The method as recited in claim 1, wherein applying the first level of bias current to the PIN diode increases a linearity of the antenna match circuit effective to reduce an amplitude of an intermodulated signal caused by concurrent transmissions of the first and second transceivers. ### Claim 3 (depends on 2) The method as recited in claim 2, wherein the amplitude of the intermodulated signal is reduced effective to prevent a receiver of the first transceiver or the second transceiver from being desensitized or blocked. ### Claim 4 (depends on 2) The method as recited in claim 2, wherein a frequency of the intermodulated signal caused by concurrent transmissions of the first and second transceivers is within one of a respective receive band of the first transceiver or the second transceiver. ### Claim 5 (depends on 1) The method as recited in claim 1, further comprising applying the second level of bias current to the PIN diode of the antenna match circuit while the first and the second transceivers are each in respective transmission modes in response to determining that a frequency of an intermodulated signal caused by concurrent transmissions of the first and the second transceivers is outside of respective receive bands of the first transceiver and the second transceiver. ### Claim 6 (depends on 1) The method as recited in claim 1, further comprising applying the second level of bias current to a PIN diode of the antenna match circuit while the first and the second transceivers are each in respective transmission modes in response to determining that an amplitude of an intermodulated signal caused by concurrent transmissions of the first and the second transceivers is less than respective minimum levels of reception of the first transceiver and the second transceiver. ### Claim 7 (depends on 1) The method as recited in claim 1, wherein: the wireless device is configured for communication in accordance with a long term evolution (LTE) standard: the first transceiver is configured for data communication in LTE band 13; and the second transceiver is configured for voice communication in band 5. ### Claim 8 (depends on 1) The method as recited in claim 1, wherein the first level of bias current is within an approximate range of three to fifteen milliamps, the second level of bias current is within an approximate range of one half to three milliamps, and the third level of bias current is approximately zero milliamps. ### Claim 9 A wireless device comprising: a first transceiver configured to transmit in a first frequency band; a second transceiver configured to transmit in a second frequency band; an antenna match circuit associated with an antenna via which signals are received by the first transceiver or the second transceiver; and a linearity controller configured to: determine whether transmissions of the first transceiver in the first frequency band and transmissions of the second transceiver in the second frequency band will produce an intermodulated signal within a respective receive band of the first transceiver or the second transceiver at an amplitude sufficient to cause receiver desensitization; and increase a linearity of the antenna match circuit effective to mitigate an amplitude of the intermodulated signal in the receive band. ### Claim 10 (depends on 9) The wireless device as recited in claim 9, wherein the antenna match circuit comprises a PIN diode and further comprising applying an increased level of bias current to the PIN diode effective to increase the linearity of the antenna match circuit. ### Claim 11 (depends on 10) The wireless device as recited in claim 10, wherein the increased level of bias current is a first level of bias current and the antenna match circuit is optimized for at least two additional levels of bias current including: a second level of bias current at which the antenna match circuit is optimized to enable reception of the signals in the respective receive band of the first transceiver; and a third level of bias current at which the antenna match circuit is optimized to enable reception of the signals in the respective receive band of the second transceiver. ### Claim 12 (depends on 11) The device as recited in claim 11, wherein: the first level of bias current is approximately three to fifteen milliamps; the second level of bias current is approximately one half to three milliamps; and the third level of bias current is approximately zero milliamps. ### Claim 13 (depends on 9) The device as recited in claim 9, wherein the intermodulated signal is a third-order intermodulation distortion product of the transmissions of the first transceiver and the transmissions of the second transceiver. ### Claim 14 (depends on 9) The device as recited in claim 9, wherein the first transceiver is configured to transmit non-voice data and the second transceiver is configured to transmit voice data. ### Claim 15 (depends on 9) The device as recited in claim 9, wherein the first transceiver or the second transceiver is configured to implement a multiple-input multiple-output (MIMO) communication scheme. ### Claim 16 A method implemented in a multi-transceiver wireless device, the method comprising: receiving signals as feedback via an antenna of the wireless device, the signals transmitted from a first transceiver and a second transceiver of the wireless device via other antennas of the wireless device; determining whether a frequency of an intermodulated signal caused by signals transmitted from the first and second transceivers is within one of a respective receive band of the first transceiver or the second transceiver; and increasing a linearity of an antenna match circuit associated with the antenna to mitigate an amplitude of the intermodulated signal in the receive band. ### Claim 17 (depends on 16) The method as recited in claim 16, wherein the antenna match circuit comprises a PIN diode and increasing the linearity of the antenna match circuit includes increasing an amount of bias current applied to the PIN diode. ### Claim 18 (depends on 17) The method as recited in claim 17, wherein the increased amount of bias current applied to the PIN diode is within a range of approximately three to twelve milliamps. ### Claim 19 (depends on 18) The method as recited in claim 18, wherein the bias current applied to the PIN diode is increased from a range of approximately one half to three milliamps. ### Claim 20 (depends on 16) The method as recited in claim 16, wherein the first transceiver and the second transceiver are configured for receiving the signals through the antenna when operably connected to the antenna via a radio frequency (RF) switch.