The present invention relates to various embodiments of a Radio-Frequency (RF) front-end for use in a receiver, a diversity receiver and a method for operating a diversity receiver.

The present invention relates to various embodiments of a Radio-Frequency (RF) front-end for use in a receiver, a diversity receiver and a method for operating a diversity receiver.

Tunable filters, cancellers, and duplexers based on passive mixers. A tunable delay cell includes passive mixers electrically coupled together for receiving an input signal and outputting a delayed signal, each passive mixer comprising a plurality of mixer switches. The tunable delay includes a control circuit for providing, to each passive mixer, a respective plurality of local oscillator (LO) signals, one to each mixer switch of each passive mixer. The control circuit is configured to vary the LO signals to cause a target frequency band of the input signal to be delayed by a target delay time in propagating through the passive mixers.

Systems and methods for antenna impedance matching provide an integrated circuit (IC) configured to be placed proximate an antenna that includes a sensor based on a coupler having forward and reverse power detectors for detecting an impedance at the antenna and provides dynamic impedance matching. Further, exemplary aspects of the present disclosure contemplate using a single wire bus capable of supplying power and providing a bidirectional serial communication link to allow communication between the IC of the present disclosure and a control circuit (e.g., a bridge or transceiver). Further aspects of the present disclosure contemplate providing systems and methods for calibrating the IC at production. Further, the accuracy of the impedance sensor may be dependent on accurate determination of power and phase difference between forward and reverse coupled signals, and a system for removing an offset between the forward and reverse power detectors is disclosed.

Systems and methods for antenna impedance matching provide an integrated circuit (IC) configured to be placed proximate an antenna that includes a sensor based on a coupler having forward and reverse power detectors for detecting an impedance at the antenna and provides dynamic impedance matching. Further, exemplary aspects of the present disclosure contemplate using a single wire bus capable of supplying power and providing a bidirectional serial communication link to allow communication between the IC of the present disclosure and a control circuit (e.g., a bridge or transceiver). Further aspects of the present disclosure contemplate providing systems and methods for calibrating the IC at production. Further, the accuracy of the impedance sensor may be dependent on accurate determination of power and phase difference between forward and reverse coupled signals, and a system for removing an offset between the forward and reverse power detectors is disclosed.

A clamping circuit that may be used to provide efficient and effective voltage clamping in an RF front end. The clamping circuit comprises two series coupled signal path switches and a bypass switch coupled in parallel with the series coupled signal path switches. A diode is coupled from a point between the series coupled signal path switches to a reference potential. In addition, an output selection switch within an RF front end has integrated voltage clamping to more effectively clamp the output voltage from the RF front end. Additional output clamping circuits can be used at various places along a direct gain signal path, along an attenuated gain path and along a bypass path.

A clamping circuit that may be used to provide efficient and effective voltage clamping in an RF front end. The clamping circuit comprises two series coupled signal path switches and a bypass switch coupled in parallel with the series coupled signal path switches. A diode is coupled from a point between the series coupled signal path switches to a reference potential. In addition, an output selection switch within an RF front end has integrated voltage clamping to more effectively clamp the output voltage from the RF front end. Additional output clamping circuits can be used at various places along a direct gain signal path, along an attenuated gain path and along a bypass path.

Disclosed is an electronic device including an antenna module including one or more antennas transmitting or receiving a signal in a first frequency band and a second frequency band wirelessly, a first duplexer separating the first frequency band into a first transmission frequency band and a first reception frequency band and adjusting the first reception frequency band, a second duplexer separating the second frequency band into a second transmission frequency band and a second reception frequency band and adjusting the second reception frequency band, and a diplexer including a first terminal electrically connected to the antenna module, a first filter passing the first frequency band, a second terminal electrically connected to the first filter and the first duplexer, a second filter passing the second frequency band, and a third terminal electrically connected to the second filter and the second duplexer. The diplexer adjusts a cut-off frequency of the first filter or the second filter in connection with the first reception frequency band adjusted through the first duplexer or the second reception frequency band adjusted through the second duplexer. In addition, various embodiments as understood from the specification are also possible.

Disclosed is a radio frequency (RF) front-end chip provided with a first antenna port and including a RF analog front-end module, a filtering module, and a switching module. The RF analog front-end module includes a first transceiver unit transmitting and receiving a signal of a first frequency band, and a second transceiver unit and a third transceiver unit transmitting and receiving a signal of a second frequency band. The filtering module transmits the received signal to the first transceiver unit or the second transceiver unit and the third transceiver unit based on the frequency band of the received signal. The switching module switches the first antenna port to the first transceiver unit, the second transceiver unit, the third transceiver unit or the filtering module, so that the first transceiver unit, the second transceiver unit or the third transceiver unit receives or transmits a signal through the first antenna port.

Disclosed is a radio frequency (RF) front-end chip provided with a first antenna port and including a RF analog front-end module, a filtering module, and a switching module. The RF analog front-end module includes a first transceiver unit transmitting and receiving a signal of a first frequency band, and a second transceiver unit and a third transceiver unit transmitting and receiving a signal of a second frequency band. The filtering module transmits the received signal to the first transceiver unit or the second transceiver unit and the third transceiver unit based on the frequency band of the received signal. The switching module switches the first antenna port to the first transceiver unit, the second transceiver unit, the third transceiver unit or the filtering module, so that the first transceiver unit, the second transceiver unit or the third transceiver unit receives or transmits a signal through the first antenna port.