Radio frequency systems with transmit and receive isolation
First Claim
1. A wireless device comprising:
- a power amplifier including a power amplifier output configured to provide a transmit signal;
one or more duplexers including a first duplexer associated with a first frequency band;
a plurality of antennas including a first antenna and a second antenna;
a plurality of switches configured to selectively connect the power amplifier output to the first antenna via a selected path chosen from a plurality of signal paths, the plurality of signal paths including a first signal path through the first duplexer and a duplexer bypass path that bypasses the one or more duplexers; and
an isolation detection system configured to control the selected path of the plurality of switches based on detecting an amount of antenna coupling between the first antenna and the second antenna, and to control switching between a duplexer mode in which the power amplifier output is connected to the first antenna through the one or more duplexers, and a duplexer bypass mode in which the power amplifier output is connected to the first antenna via the duplexer bypass path, the isolation detection system further configured to control switching between the duplexer mode and the duplexer bypass mode based on the detected amount of antenna coupling.
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Abstract
Radio frequency systems with transmit and receive isolation are provided. In certain configurations, a wireless device includes a power amplifier including a power amplifier output configured to provide a transmit signal, one or more duplexers including a first duplexer associated with a first frequency band, a plurality of antennas including a first antenna and a second antenna, a plurality of switches, and an isolation detection system. The plurality of switches are configured to selectively connect the power amplifier output to the first antenna via a selected path chosen from a plurality of signal paths, including a first signal path through the first duplexer and a duplexer bypass path that bypasses the one or more duplexers. Additionally, the isolation detection system is configured to control the selected path of the plurality of switches based on detecting an amount of antenna coupling between the first antenna and the second antenna.
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Citations
20 Claims
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1. A wireless device comprising:
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a power amplifier including a power amplifier output configured to provide a transmit signal; one or more duplexers including a first duplexer associated with a first frequency band; a plurality of antennas including a first antenna and a second antenna; a plurality of switches configured to selectively connect the power amplifier output to the first antenna via a selected path chosen from a plurality of signal paths, the plurality of signal paths including a first signal path through the first duplexer and a duplexer bypass path that bypasses the one or more duplexers; and an isolation detection system configured to control the selected path of the plurality of switches based on detecting an amount of antenna coupling between the first antenna and the second antenna, and to control switching between a duplexer mode in which the power amplifier output is connected to the first antenna through the one or more duplexers, and a duplexer bypass mode in which the power amplifier output is connected to the first antenna via the duplexer bypass path, the isolation detection system further configured to control switching between the duplexer mode and the duplexer bypass mode based on the detected amount of antenna coupling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radio frequency system comprising:
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a power amplifier module including a power amplifier output configured to provide a transmit signal; one or more low noise amplifiers; and a front end module configured to control access of the power amplifier module and the one or more low noise amplifiers to a plurality of antennas including a first antenna and a second antenna, the front end module including one or more duplexers including a first duplexer associated with a first frequency band, and a plurality of switches configured to selectively connect the power amplifier output to the first antenna via a selected path chosen from a plurality of signal paths, the plurality of signal paths including a first signal path through the first duplexer and a duplexer bypass path that bypasses the one or more duplexers, the front end module further including an isolation detection system configured to control the selected path of the plurality of switches based on detecting an amount of antenna coupling between the first antenna and the second antenna, and to control switching between a duplexer mode in which the power amplifier output is connected to the first antenna through the one or more duplexers, and a duplexer bypass mode in which the power amplifier output is connected to the first antenna via the duplexer bypass path, the isolation detection system further configured to control switching between the duplexer mode and the duplexer bypass mode based on the detected amount of antenna coupling. - View Dependent Claims (13, 14, 15, 16)
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17. A method for isolating radio frequency signals during transmit and receive operations, the method comprising:
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generating a transmit signal at an output of a power amplifier based on amplifying a radio frequency signal; detecting an amount of antenna coupling between a first antenna and a second antenna using an isolation detection system; controlling a selected path through a plurality of switches based on the amount of antenna coupling detected by the isolation detection system, the selected path chosen from a plurality of signal paths including a signal path through a duplexer and a duplexer bypass path that bypasses the duplexer; controlling switching with the isolation detection system based on the detected amount of antenna coupling between a duplexer mode in which the output of the power amplifier is connected to the first antenna through the duplexer, and a duplexer bypass mode in which the output of the power amplifier is connected to the first antenna via the duplexer bypass path; and connecting the output of the power amplifier to the first antenna via the selected path using the plurality of switches. - View Dependent Claims (18, 19, 20)
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Specification