Patent application number | Description | Published |
20130273859 | SYSTEMS AND METHODS RELATED TO IMPROVED ISOLATION BETWEEN TRANSMIT AND RECEIVE RADIO-FREQUENCY SIGNALS - 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. | 10-17-2013 |
20130273860 | SYSTEMS AND METHODS FOR REDUCING FILTER INSERTION LOSS WHILE MAINTAINING OUT-OF-BAND ATTENUATION - Disclosed are systems and methods for reducing filter insertion loss while maintaining out-of-band attenuation. In some embodiments, a system can be configured for processing of radio-frequency (RF) signals. The system can include a plurality of signal paths configured to accommodate multiple frequency bands, with each of the multiple bands having a passband. The system can further include a filter circuit disposed along each of the signal paths. At least one of the filter circuits can be segmented into two or more segments that substantially cover the passband corresponding to the filter circuit. The segmented filter circuit can be configured to provide a desired attenuation of out-of-band interferers and a desired insertion loss level. In some embodiments, the signal paths can include receive (Rx) paths. | 10-17-2013 |
20140321339 | DUPLEXER ARCHITECTURES AND METHODS FOR ENABLING ADDITIONAL SIGNAL PATH - Disclosed are architectures and methods for enabling additional signal path. In some embodiments, a frequency division duplexing (FDD) system can include a transmit (Tx) path configured for passage of a Tx signal in a first frequency band during operation in a first mode; a receive (Rx) path configured for passage of an Rx signal in a second frequency band during operation in a second mode, with the second mode being different than the first mode, and the second frequency band having at least some overlap with the first frequency band; and a bandpass filter disposed along the Tx path and along the Rx path, with the bandpass filter being configured to filter the Tx signal when in the first mode and to filter the Rx signal when in the second mode. Such a system can be advantageous in wireless devices capable of operating in different geographic locations. | 10-30-2014 |
20150133067 | SYSTEMS AND METHODS RELATED TO CARRIER AGGREGATION FRONT-END MODULE APPLICATIONS - Improved switched multiplexer architecture for supporting carrier aggregation in front-end applications. In some embodiments, an N-plexing system can include an assembly of filters configured to provide N filtered paths, and a switching circuit in communication with the assembly of filters. The switching circuit can be configured to provide a plurality of switchable paths between the assembly of filters and an antenna port to allow simultaneous operation between the N filtered paths and the antenna port. In some embodiments, N can be 4 for a quadruplexing system or 2 for a duplexing system, and such a system can be implemented in a front-end module (FEM) for wireless devices. | 05-14-2015 |
20160006556 | SYSTEMS AND METHODS RELATED TO TIME-DIVISION AND FREQUENCY-DIVISION DUPLEX PROTOCOLS FOR WIRELESS APPLICATIONS - Systems and methods related to time-division and frequency-division duplex protocols for wireless applications. In some embodiments, a wireless architecture can include a radio-frequency (RF) path configured to support a first modified time-division duplex (TDD) band operation and a second modified TDD band operation. Such a wireless architecture can allow consolidation of signal paths and/or re-use of components such as filters and duplexers, to advantageously reduce or eliminate some paths and/or components. | 01-07-2016 |
20160044677 | FRONT END ARCHITECTURE FOR INTERMITTENT EMISSIONS AND/OR COEXISTENCE SPECIFICATIONS - In an embodiment, an apparatus includes a first transmit path, a second transmit path, and a switch element. The first transmit path can provide a first radio frequency (RF) signal in accordance with a nominal specification. The second transmit path can provide a second RF signal in accordance with an intermittent specification, in which the first and second RF signals are within the same transmit band. The switch element can provide the first RF signal as a transmit mode output in a first state and provide the second RF signal as the transmit mode output in a second state. | 02-11-2016 |