Systems and methods related to improved isolation between transmit and receive radio-frequency signals
First Claim
1. A system for isolating radio-frequency signals during transmit and receive operations, the system comprising:
- a transmit path configured for passage of a first radio frequency signal;
a power amplifier including a first filter bank and a plurality of stages including an input stage and an output stage, the first filter bank disposed along the transmit path after the input stage and before the output stage, the first filter bank further configured to filter the first radio frequency signal;
one or more switches;
a first antenna connected to the transmit path via the one or more switches;
a second antenna connected to a receive path and configured to receive a second radio frequency signal, the first and second antennas separated from each other to provide isolation between the transmit and receive paths;
a duplexer path configured to facilitate a duplexer mode where both transmit and receive operations are performed with the first antenna, and a duplexer bypass, the one or more switches configured to allow switching between the duplexer mode and a duplexer bypass mode where both of the first and second antennas are being used; and
an isolation detection system configured to control a state of the one or more switches based on detecting an amount of antenna coupling between the first antenna and the second antenna, and to control switching between the duplexer mode and the duplexer bypass mode.
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Accused Products
Abstract
Disclosed are systems and methods for improving isolation between transmit and receive radio-frequency (RF) signals. In some embodiments, a system can be implemented for isolating RF signals during Tx and Rx operations. The system can include a Tx path and an Rx path, with the Tx path having a filter. In some embodiments, the Tx path can include a power amplifier having a plurality of interstages and an output stage, and the filter can be implemented at one of the interstages and before the output stage. The system can further include first and second antennas connected respectively to the Tx and Rx paths. The Tx path, the Rx path, and/or the first and second antennas can be configured to yield a desired level of isolation between the RF signal in the Tx and Tx paths.
30 Citations
20 Claims
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1. A system for isolating radio-frequency signals during transmit and receive operations, the system comprising:
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a transmit path configured for passage of a first radio frequency signal; a power amplifier including a first filter bank and a plurality of stages including an input stage and an output stage, the first filter bank disposed along the transmit path after the input stage and before the output stage, the first filter bank further configured to filter the first radio frequency signal; one or more switches; a first antenna connected to the transmit path via the one or more switches; a second antenna connected to a receive path and configured to receive a second radio frequency signal, the first and second antennas separated from each other to provide isolation between the transmit and receive paths; a duplexer path configured to facilitate a duplexer mode where both transmit and receive operations are performed with the first antenna, and a duplexer bypass, the one or more switches configured to allow switching between the duplexer mode and a duplexer bypass mode where both of the first and second antennas are being used; and an isolation detection system configured to control a state of the one or more switches based on detecting an amount of antenna coupling between the first antenna and the second antenna, and to control switching between the duplexer mode and the duplexer bypass mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A radio-frequency device comprising:
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a transceiver configured to process radio frequency signals; first and second antennas in communication with the transceiver to facilitate transmission and reception of the radio frequency signals; and a circuit configured to provide isolation of the radio frequency signals during transmit and receive operations, the circuit including a transmit path configured for passage of a first radio frequency signal, the circuit further including a power amplifier including a first filter bank and a plurality of stages including an input stage and an output stage, the first filter bank disposed along the transmit path after the input stage and before the output stage, the first filter bank further configured to filter the first radio frequency signal, the circuit further including one or more switches that connect the transmit path to the first antenna, the circuit further including a receive path configured to receive a second radio frequency signal from the second antenna, the circuit further including a duplexer path configured to facilitate a duplexer mode where both transmit and receive operations are performed with the first antenna, and a duplexer bypass, the one or more switches configured to allow switching between the duplexer mode and a duplexer bypass mode where both of the first and second antennas are being used, the circuit further including an isolation detection system configured to control a state of the one or more switches based on detecting an amount of antenna coupling between the first antenna and the second antenna, and to control switching between the duplexer mode and the duplexer bypass mode. - View Dependent Claims (17, 18, 19)
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20. A method for isolating radio-frequency signals during transmit and receive operations, the method comprising:
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passing a first radio frequency signal through a transmit path; amplifying the first radio frequency signal using a power amplifier that includes a first filter bank and a plurality of stages including an input stage and an output stage; filtering the first radio frequency signal using the first filter bank, the first filter bank disposed along the transmit path after the input stage and before the output stage; passing the first radio frequency signal to a first antenna to transmit the first radio frequency signal via one or more switches; receiving a second radio frequency signal through a second antenna; passing the second radio frequency signal through a receive path, the first and second antennas separated from each other to provide isolation between the transmit and receive paths; and controlling a state of the one or more switches based on detecting an amount of antenna coupling between the first antenna and the second antenna using an isolation detection system, including using the isolation detection system to control switching between a duplexer mode in which both transmit and receive operations are performed with the first antenna and a duplexer bypass mode in which both of the first and second antennas are used.
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Specification