Abstract: For example, a wireless communication device may be configured to determine a Concurrent Multiple Band (CMB) routing scheme based on Quality of Service (QoS) requirement information and network condition information, the CMB routing scheme to route a plurality of application streams to a plurality of radios of the wireless communication device for wireless communication over a plurality of wireless communication bands, the plurality of application streams corresponding to one or more applications to be executed by the wireless communication device; and to route the plurality of application streams to the plurality of radios by determining, based on the CMB routing scheme, to which radio of the plurality of radios to route the application stream of the plurality of application streams.

Abstract: A radio frequency circuit includes: a first filter having a passband corresponding to a first frequency band of at least 5 gigahertz and less than a predetermined frequency; a second filter having a passband corresponding to a second frequency band of at least the predetermined frequency; a switch configured to switch connection of the first filter between a first transfer circuit and a third transfer circuit. The first filter is connected between a first antenna connector terminal and the first transfer circuit and between the first antenna connector terminal and the third transfer circuit. The second filter is connected between a second antenna connector terminal and a second transfer circuit. A first communication system or a second communication system is a wireless local area network (WLAN) system.

Abstract: A switch assembly includes a PIN diode connected between an antenna port and a receive port, a first shunt FET device connected between the receive port and ground, a first series FET device connected between the antenna port and a transmit port, a second shunt FET device connected between the transmit port and ground, and a plurality of bias control contacts configured to receive a corresponding plurality of bias control voltages to forward bias the first shunt FET device and the first series FET device into an ON state and to reverse bias the PIN diode and the second shunt FET device into an OFF state in a transmit mode, and to reverse bias the first shunt FET device and the first series FET device into the OFF state and to forward bias the PIN diode and the second shunt FET device into the ON state in a receive mode.

Abstract: A radio-frequency circuit is used in simultaneous transfer of a radio-frequency signal of 4G and a radio-frequency signal of 5G, and includes a first transfer circuit that receives the radio-frequency signal of 4G or the radio-frequency signal of 5G which are input in a switching manner, and transfers a radio-frequency signal of a first communication band including a first transmission band and a first reception band and a radio-frequency signal of a second communication band including a second transmission band and a second reception band. The first and second transmission bands at least partially overlap. The first transfer circuit includes a first power amplifier that amplifies transmission signals of the first and second communication bands, and a first transmission filter that has a first passband including the first and second transmission bands, and passes the transmission signals of the first and second communication bands output from the first power amplifier.

Abstract: A device includes a transmitter. A main antenna is coupled to the transmitter. A matching network coupled to the transmitter and configured to match an impedance of the main antenna, wherein one or more components of the matching network provide a desired radiation.

Abstract: Embodiments of wireless audio systems and methods for wirelessly communicating audio information are disclosed herein. In one example, wireless transceiver includes a first antenna, a second antenna, and a radio frequency (RF) module. The first antenna and second antenna are configured to establish communication links with an audio source and another wireless transceiver. The RF module is configured to receive audio information from the audio source based on a first communication link using the first antenna and the second antenna and receive audio play information from the another wireless transceiver based on a second communication link using the first antenna and the second antenna. A data transmission proportion of the first communication link allocated between the first antenna and the second antenna is dynamically adjusted based on qualities of data communicated by the first antenna and the second antenna through the first transmission link.

Abstract: A half-duplex transceiver includes an antenna, antenna-side transformer windings coupled to the antenna, and a low-noise amplifier coupled to the antenna by the antenna-side transformer windings.

Abstract: Front end systems with switched termination for enhanced intermodulation distortion performance are provided herein. The switched termination can be used on transmit paths and/or receive paths of the front end system to suppress impedance variation when the signal paths are inactive. For example, with respect to switched termination for transmit paths, a front end system can include a frequency multiplexing circuit connected to a band switch by a first radio frequency (RF) signal path and by a second RF signal path. The band switch selectively provides the frequency multiplexing circuit with a first transmit signal over the first RF signal path and with a second transmit signal over the second RF signal path. The front end system further includes a switched termination circuit in shunt with the first RF signal path and operable to turn on to suppress impedance variation when the first RF signal path is inactive.

Abstract: An apparatus for detecting worn and/or unworn status of a wearable host device includes one or more first antennas, a second antenna, and a radio-frequency (RF) circuit to measure a dielectric loading based on an RF isolation. The second antenna is placed within a portion of the wearable host device that is substantially in contact with the skin of a user, and the RF isolation is between at least one of the one or more first antennas and the second antenna.

Abstract: A biometric classification system includes a biometric capture system that captures a biometric identifier. A classifier includes a plurality of group classifiers. Each group classifier in the plurality of classifiers includes a group discriminator that determines, based on the captured biometric identifier, whether the biometric identifier belongs to a group of persons associated with the group discriminator, and includes a plurality of object discriminators. Each object discriminator is associated with a single person within the group of persons. The group discriminator determines whether the biometric identifier belongs to the group of persons. The object discriminator determines whether the biometric identifier belongs to the single person associated with the object discriminator.

Abstract: A cooperative multi-band wireless station architecture that enables full duplex operations of wireless stations (STAs). Such an STA includes a WIFI transceiver and one or more additional transceivers. The two transceivers (and the associated channels) operate in mutually exclusive WIFI bands or different types of protocols and therefore can transmit and/or receive simultaneously without signal interference to each other. The multiple transceivers can perform independent clear channel assessment (CCA) and then simultaneously perform signal transmission or reception jointly or independently. In a cooperative multi-band operation, one channel may be used as an independent assistant channel and responsible for supplying assistant information relevant to a transmission opportunity (TXOP) for the other channel (primary channel) to take corresponding actions.

Abstract: An apparatus can include a plurality of antennas. The apparatus can include a first transceiver coupled to the plurality of antennas. The apparatus can include a second transceiver. The second transceiver can be an RFID transceiver. The apparatus can include a controller coupled to the first transceiver and coupled to the RFID transceiver. The controller can detect the presence of an RFID tag. The controller can retrieve, in response to detecting the presence of the RFID tag, information corresponding to the RFID tag. The information can include radio-frequency shielding information regarding electrically conductive material of an article of clothing. The controller can adjust the first transceiver based on the information retrieved corresponding to the RFID tag.

Abstract: A user equipment (UE) may communicate using different radio access technologies on adjacent frequency bands. The UE may determine that the UE is not receiving wireless signals for a second radio access technology that utilizes a second frequency band adjacent to a first frequency band for a first radio access technology. The UE may place a transmitter of the UE in a filter bypass mode in which a transmit signal bypasses a transmit filter for the first radio access technology in response to determining that the wireless signals for the second radio access technology are not received. The UE may scan, using a receiver for the second radio access technology, while in the filter bypass mode, the second frequency band for a signal for the second radio access technology between scheduled transmissions for the first radio access technology.

Abstract: Technologies directed to cable-loss compensation are described. An apparatus includes a triplexer, a front-end module (FEM) circuit, and a control circuit. The triplexer is coupled to a radio frequency (RF) cable. The triplexer receives a first RF signal and a DC power signal from a device via the RF cable and sends a detection signal being indicative of a transmit power level of the first RF signal to the device via the RF cable. The transmit power level includes an insertion loss of the RF cable. The FEM circuit is coupled to the triplexer and includes a power amplifier (PA). The control circuit is coupled to the triplexer and measures the transmit power level of the first RF signal and converts the first RF signal into the detection signal. The control circuit sends the detection signal back to the device via the RF cable and enables the PA.

Abstract: A distribution element for a self-calibrating RF network and system and method for use of the same are disclosed. In one embodiment of the distribution element, the distribution element is located between a headend layer and an endpoint layer. An upstream directional control circuit and a downstream directional control circuit are positioned in a spaced opposing relationship such that respective upstream line and the downstream line are separated into a forward line and reverse line therebetween while being combined at the respective upstream directional control circuit and the downstream directional control circuit. A pair of amplifier circuits positioned between the upstream and downstream control circuits are under the control of a controller to amplify and shape the signal of the forward line and the reverse line. The controller monitor and analyzes signals through the distribution element.

Abstract: Polarimetric transceiver front-ends and polarimetric phased array transceivers include two receive paths configured to receive signals from an antenna, each including a respective variable phase shifter. A first transmit path is connected to the variable phase shifter of one of the two receive paths and is configured to send signals to the antenna. A transmit/receive switch is configured to select between the first transmit path and the two receive paths for signals. The transmit/receive switch has an element that adds a high impedance to the transmit path when the transmit/receive switch is in a receiving state.

Abstract: A transmission apparatus and method, respectively, mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system. To enable selection of robustness for transmission of data, the apparatus includes a frame forming mechanism mapping data blocks of at least two mapping input data streams onto frames of the mapping output data stream covering the channel bandwidth, each frame including a payload portion, the payload portion including plural data symbols and being segmented into data segments each covering a bandwidth portion of the channel bandwidth. The frame forming mechanism is configured to map the data blocks of the at least two mapping input data streams onto data symbols of the payload portion and includes a MIMO mode selector selecting a MIMO mode of the data blocks per data segment and/or per mapping input data stream.

Abstract: A wireless device comprising a first antenna and second antenna, a transceiver and a radio frequency front end system electrically coupled between the transceiver and the antennas. The RF front end system includes a first module operable to provide a high band transmit signal to the first antenna, receive a first high band receive signal and a first mid band receive signal from the first antenna. The first high band receive signal has a frequency range greater than that of the first mid band receive signal. The RF front end system further includes a second module operable to provide a mid band transmit signal to the second antenna, receive a second mid band receive signal and a second high band receive signal from the second antenna. The second high band receive signal has a frequency range greater than that of the second mid band receive signal.

Abstract: An electrical balance duplexer (EBD) may be used to isolate a transmitter and receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the EBD to cut-off access to the common antenna rather than duplicate the antenna impedance, the EBD is balanced. Such cut-offs may have a lower insertion loss than an EBD that merely duplicates the antenna impedance to separate the differential signals of the receiver/transmitter from the common mode signal.

Abstract: A system for enhancing isolation in coexisting time-division duplexed (TDD) transceivers includes: a blocker canceller that transforms a transmit signal of a TDD transceiver into a blocker cancellation signal configured to remove transmit-band interference in a receive signal; a first filter that filters the blocker cancellation signal; a second filter that filters the transmit signal; and a transmit-noise canceller that transforms the filtered transmit signal into a transmit noise cancellation signal configured to remove receive-band interference in the receive signal.

Abstract: A system and a control method for generating multiple independent alternating current (AC) voltages from a direct current (DC) voltage source in a single-inductor multiple-output (SIMO) inverter are disclosed. The system comprising: a DC voltage source (101) for providing electrical energy; a front-stage DC-DC power converter (105) comprising exactly one inductor as an energy storage element for power conversion and a main switching element; a plurality of selectable output branches (106), wherein each output branch comprises an output selection switch (107), a resonant tank (110), and a transmitter coil (109), wherein the resonant tank converts output power of the DC-DC power converter into AC power for feeding the transmitter coil; and a controller (104) for determining ON/OFF states of the main switching element and the output selection switch of each of the output branches.

Abstract: Technologies directed to antenna disconnection detection of distributed radio frequency (RF) ports in a wireless network are described. One method receives data from the wireless devices and generates an RSSI matrix including multiple elements, each storing a receive signal strength indicator (RSSI) value indicative of a signal strength of a wireless link between a transmitter-receiver pair. The method identifies a characteristic pattern in the RSSI matrix. The characteristic pattern includes i) two or more RSSI values in a same row being less than the threshold value and ii) two or more RSSI values in a same column being less than the threshold value. The method stores an indication that an antenna is disconnected from an RF port and sends a command to the second wireless device that causes the second wireless device to disable a radio that is coupled to the RF port.

Abstract: Disclosed is an electronic device. The electronic device according to an embodiment includes an antenna element configured to receive a signal in at least one frequency band of a first frequency band and a second frequency band, a signal distributor electrically connected with the antenna element, and including a first filter corresponding to the first frequency band and a second filter corresponding to the second frequency band, a matching circuit electrically connectable with the second filter, a transceiver electrically connected with the signal distributor, a switch connecting the second filter with the matching circuit or the transceiver, and a processor electrically connected with the transceiver. Moreover, various embodiments found through the present disclosure are possible.

Abstract: Provided is a Single Pole N Throw (SPNT) switch including: a transmission line unit including a plurality of transmission lines each connected between a plurality of selection terminals and a single common terminal; and a SPST switch unit including a plurality of SPST switches for grounding each of the plurality of transmission lines, wherein the SPST switches allows at least a part of the plurality of transmission lines and other transmission lines to operate as open nodes at the common terminal for different frequencies.

Abstract: In accordance with an embodiment, a circuit includes a plurality of filter circuits having a first port, a second port and a third port, where a second port of a first of the plurality of filter circuits is coupled to a first port of a second of the plurality of filter circuits, and each of the plurality of filter circuits includes a first passive filter, a second passive filter, a first coupler and a combining network. The first coupler includes an input port coupled to the first port, an isolated port coupled to the second port, a first phase shifted port coupled to the first passive filter and a second phase shifted port coupled to the second passive filter, and the combining network includes a first input coupled to the first passive filter, a second input coupled to the second passive filter, and an output coupled to the third port.

Abstract: A method for testing Bluetooth radiation performance of a terminal includes: acquiring first-type radiation parameters under various test conditions; acquiring a second-type radiation parameter under a first test condition; determining second-type radiation parameters under other test conditions according to the first-type radiation parameters under the various test conditions and the second-type radiation parameter under the first test condition; and determining a total Bluetooth radiation performance parameter of the terminal according to the second-type radiation parameter under the first test condition and the second-type radiation parameters under the other test conditions.

Abstract: Channel-based remote unit monitoring and optimization in a wireless communications system (WCS) is described herein. A remote unit control circuit receives a number of communications signals each uniquely associated with a signal channel and a remote unit communicating on the signal channel. The communications signals are received by the remote unit control circuit before being recombined based on signal sources. The communications signals may be analyzed to determine key performance indicators (KPIs) for a selected signal channel (s) and/or a selected remote unit (s). The KPIs may be used to optimize performance of the WCS on a per signal channel and/or per remote unit basis. By employing the remote unit control circuit to determining the KPIs based on a selected signal channel (s) and/or a selected remote unit (s), it is possible to support channel-based remote unit monitoring and optimization in the WCS, thus helping to provide optimized user experience in the WCS.

Abstract: The present disclosure relates to the field of communication devices and in particular, to a mobile device and a method for manufacturing the mobile device. The mobile device includes: a metal middle frame, a glass back shell covering the metal middle frame, and an FPC antenna disposed on an inner surface of the glass back shell. The FPC antenna includes a flexible substrate layer and a metal pattern layer attached to the flexible substrate layer, the flexible substrate layer is laminated onto the inner surface of the glass back shell, the metal pattern layer is formed on a surface of the flexible substrate layer by a LDS process, the FPC antenna is electrically connected to the metal middle frame, and the inner surface of the glass back shell faces the metal middle frame. The FPC antenna in the mobile device provided by the present disclosure has a better performance.

Abstract: Wireless communications systems and methods related to improving detectability of interference management signals are provided. A first wireless communication device communicates, with a second wireless communication device, a first reservation signal indicating a reservation for a first transmission slot in a spectrum accessed by a plurality of network operating entities. The first wireless communication device and the second wireless communication device are associated with a first network operating entity of a plurality of network operating entities. The first reservation signal includes a duration based on a power class associated with the first network operating entity. The first wireless communication device communicates, with the second wireless communication device, a first communication signal in the first transmission slot.

Abstract: An antenna module includes a connection member including at least one wiring layer and at least one insulating layer, an antenna package including a plurality of antenna members transmitting or receiving a radio frequency (RF) signal and a plurality of feed vias respectively electrically connected to the plurality of antenna members at one end and respectively electrically connected to a wiring corresponding to the at least one wiring layer at the other end, and positioned on a first surface of the connection member, an integrated circuit (IC) disposed on a second surface of the connection member and electrically connected to the wiring corresponding to the at least one wiring layer to receive an intermediate frequency (IF) signal or baseband signal and transfer an RF signal or receive an RF signal and transfer an IF signal or baseband signal, and a filter filtering an IF signal or a baseband signal.

Abstract: An electronic device is provided. The electronic device includes a housing; a communication circuit in the housing and configured to generate a signal for a time division duplexer (TDD) and a frequency division duplexer (FDD); an antenna electrically connected with the communication circuit; a plurality of electrical paths; and a control circuit, wherein each electrical path comprises a first transistor configured to connect with each electrical path in series, and a second transistor configured to connect with each electrical path and a ground, wherein the control circuit is configured to receive a wireless signal, select at least one of the TDD and the FDD to transmit the received wireless signal, and selectively activate a first transistor and a second transistor disposed in at least one electrical path and first and second transistors disposed in at least another electrical path among the plurality of electrical paths based on the selection.

Abstract: A learning protocol for distributed antenna state selection in directional cognitive small-cell networks is described. Antenna state selection is formulated as a nonstationary multi-armed bandit problem and an effective solution is provided based on the adaptive pursuit method from reinforcement learning. A cognitive small cell testbed, called WARP-TDMAC, provides a useful software-defined radio package to explore the usefulness of compact, electronically reconfigurable antennas in dense small-cell configurations. A practical implementation of the adaptive pursuit method provides a robust distributed antenna state selection protocol for cognitive small-cell networks. Test results confirm that directionality provides significant advantages over omnidirectional transmission which suffers high throughput reduction and complete link outages at above-average jamming or cross-link interference power.

Abstract: A radio frequency front end circuit includes a switch circuit, duplexers, and a capacitor. The switch circuit includes a main switch that switches connection between a common terminal and a selection terminal, a sub-switch that switches connection between the selection terminal and the ground according to exclusive ON and OFF relative to the main switch, a main switch that switches connection between the common terminal and a selection terminal, and a sub-switch that switches connection between the selection terminal and the ground according to exclusive ON and OFF relative to the main switch. The switch circuit is switched between a first connection form in which only one of the main switches is ON and a second connection form in which both the main switches are ON. The capacitor allows connection between the selection terminal and the selection terminal.

Abstract: Systems and methods to selectively attach and control antennas via diodes. In one embodiment, a system includes: a reader having a plurality of reader antennas of different polarizations to transmit radio frequency signals; and at least one radio frequency device. The radio frequency device includes: a plurality of tag antennas of different polarizations; a plurality of diodes coupled to the plurality of tag antennas respectively; a receiver coupled to the plurality of diodes to receive the radio frequency signals from the tag antennas when the diodes are forward biased; and a set of one or more current controllers coupled to the plurality of diodes. In a receiving mode the controllers selectively forward bias the diodes to receive the signals from the reader. In a transmitting mode the controllers selectively change the state of the tag antennas to transmit data via backscattering the radio frequency signals.

Abstract: Systems, methods, and circuitries enable selected signal components to be isolated in a feedback transmit signal that includes multiple signal components. In one example, a signal component cancellation system for a feedback receiver includes a transmit chain configured to transmit a transmit signal having at least two signal components with offset center frequencies. The system includes measurement circuitry configured to measure a received signal that results from feedback of the transmit signal and cancellation circuitry configured to cancel a selected signal component from the transmit signal to generate a cancellation signal. The system further includes subtraction circuitry configured to combine the cancellation signal with the measured received signal to generate a component signal corresponding to a contribution of the selected signal component to the received signal and provide the component signal to the feedback receiver.

Abstract: An automatic impedance matching method for a radio-frequency chain comprises: an impedance matching network having an input and an output, a first radio-frequency device connected to the input and a second radio-frequency device connected to the output, the impedance matching network exhibiting a reconfigurable topology and comprising a plurality of reactive elements, at least one of which exhibits a variable reactance, the method comprising the choice of the configuration of the impedance matching network allowing the implementation of impedance matching while minimizing losses. An automatic impedance matching module for implementing the method is provided. Radio-frequency transmission and reception chains comprising a module are also provided.

Abstract: A wireless communication device in a cellular wireless communication system activates (402) radio receiver circuitry during repeated time windows. The repeated activation has a nominal repetition time interval, T, and each repeated time window has a window duration, DT. During each DT, detection (404) is made of a plurality of synchronization signals that are transmitted by a respective cell. Based on the detected synchronization signals, calculation (406) is made of a respective cell quality value. These calculated quality values are then provided (408) to a mobility process. Depending (410) on the calculated quality values and at least a first quality threshold, any of T and DT are adjusted (412).

Abstract: In an embodiment, an apparatus includes a first radio frequency (RF) signal path and a second RF signal path. The first RF signal path can provide a first RF signal when active and the second RF signal path can provide a second RF signal when active. The second RF signal path can include a matching network with a load impedance configured to prevent a resonance in the second RF signal path due to coupling with the first RF signal path when the first RF signal path is active.

Abstract: A wireless device comprising a first antenna and second antenna, a transceiver and a radio frequency front end system electrically coupled between the transceiver and the antennas. The RF front end system includes a first module operable to provide a high band transmit signal to the first antenna, receive a first high band receive signal and a first mid band receive signal from the first antenna. The first high band receive signal has a frequency range greater than that of the first mid band receive signal. The RF front end system further includes a second module operable to provide a mid band transmit signal to the second antenna, receive a second mid band receive signal and a second high band receive signal from the second antenna. The second high band receive signal has a frequency range greater than that of the second mid band receive signal.

Abstract: Techniques and apparatuses are described that implement a compact multiple-input multiple-output (MIMO) antenna module with two monopole antennas and a decoupling circuit. Due to a physical proximity of the two monopole antennas within the compact MIMO antenna module, the two monopole antennas indirectly couple to each other through one or more coupling paths. The decoupling circuit attenuates the resulting interference by providing a direct coupling path between the two monopole antennas. In this way, the decoupling circuit effectively counteracts the indirect coupling between the two monopole antennas to enable the two monopole antennas to behave substantially independent of each other for MIMO applications. The compact MIMO antenna module can be implemented within space-constrained devices and realize improved performance relative to other antenna modules that have a similar antenna spacing and do not include the decoupling circuit.

Abstract: A high-frequency-signal transceiver circuit transmits and receives a signal between first to sixth antenna terminals and terminals near a high-frequency circuit. The high-frequency-signal transceiver circuit includes first to sixth circuits connected to the corresponding first to sixth antenna terminals. One of the first to sixth circuits transmits and receives only a signal of time division multiplexing communication.

Abstract: A communication device includes a base, a signal transceiver, a first antenna array and a second antenna array. The signal transceiver is configured to up-convert or down-convert the radio frequency signals. The first antenna array is disposed on the base and electrically coupled to the transceiver. The first antenna array is configured to receive or transmit a first radio frequency signal along a first orientation. The first radio frequency signal is transmitted between the first antenna array and the transceiver. The second antenna array is disposed on the base and electrically coupled to the first antenna array. The second antenna array is configured to receive or transmit a second radio frequency signal along a second orientation. The first radio frequency signal is transmitted between the second antenna array and the transceiver, via the first antenna array.

Abstract: A circuit arrangement (1) for compensating for a damping occurring in an antenna line between a mobile radio terminal (2) and an antenna (3), comprising a plurality of partial branches (T1, T2, T3) in each case for assigned transmission services for specific frequency bands, is described.

Abstract: A digital-to-analog converter (DAC) and a method for operating the DAC are disclosed. The DAC receives, over a first channel, a control signal that is transmitted in accordance with a binary protocol. The DAC also receives, over a second channel different than the first channel, data that is transmitted in accordance with a multilevel communication protocol that is different than the binary protocol. The DAC determines a plurality of first and second voltages based on the received data and identifies, based on the control signal, a time when data transmission or reception is switched between first and second antennas. In response to identifying, based on the control signal, the time when data transmission or reception is switched, the DAC outputs the determined plurality of first voltages to a first antenna tuning circuit or the determined plurality of second voltages to a second antenna tuning circuit.

Abstract: A computer stylus may be provided that includes an elongated body with a tip and an opposing end coupled together by a shaft that includes a metal tube. The stylus may include a substrate at the end of the elongated body and conductive traces on the substrate. The traces may form a sensor electrode for a sensor and an antenna resonating element for an antenna in the stylus. The sensor may include an electrode that gathers sensor signals. Control circuitry may wirelessly transmit the sensor signals to external equipment using the antenna. The sensor electrode may be coupled to the metal tube by a filter. The filter may form an open circuit at radio-frequencies and a short circuit at the frequency of the sensor signals. The filter may mitigate deterioration in wireless performance of the antenna associated with the presence of the sensor.

Abstract: Disclosed examples include differential amplifier circuits and variable neutralization circuits for providing an adjustable neutralization impedance between an amplifier input node and an amplifier output node, including neutralization impedance T circuits with first and second impedance elements in series between the amplifier input and output, and a third impedance element, including a first terminal connected to a node between the first and second impedance elements, and a second terminal connected to a transistor. The transistor operates according to a control signal to control the neutralization impedance between the amplifier input node and the amplifier output node.

Abstract: A system for enhancing isolation in coexisting time-division duplexed (TDD) transceivers includes: a blocker canceller that transforms a transmit signal of a TDD transceiver into a blocker cancellation signal configured to remove transmit-band interference in a receive signal; a first filter that filters the blocker cancellation signal; a second filter that filters the transmit signal; and a transmit-noise canceller that transforms the filtered transmit signal into a transmit noise cancellation signal configured to remove receive-band interference in the receive signal.

Abstract: A digital step attenuator (DSA) includes a switch control circuit which receives the attenuated signal output by the DSA from a buffer and generates a tracked control signal for switches within the DSA. Some switch control circuits include a capacitor coupled to receive the buffered signal, a supply voltage, and a switch control logic sub-circuit for each switch. Each switch control logic sub-circuit receives a control signal, for either the gate or the bulk terminal of the switch, and generates the tracked control signal. In other embodiments, switch control circuits include a complementary MOSFET switching device coupled to receive a control signal, and a capacitor coupled to receive the buffered signal, both of which are connected to an output terminal for the tracked control signal. In those embodiments, the DSA includes a switch control circuit for each switch connected to the DSA output.

Abstract: Aspects of the subject disclosure may include, for example, a guided wave launcher generates, in response to an output RF signal, a guided electromagnetic wave along a surface of a transmission medium, wherein the guided electromagnetic wave propagates along the surface of the transmission medium without requiring an electrical return path, and wherein the guided electromagnetic wave has a non-optical carrier frequency. A mismatch probe generates a mismatch signal based on the output RF signal, wherein the mismatch signal indicates an impedance mismatch of the guided wave launcher. A controller generates one or more control signals in response to the mismatch signal, wherein the one or more control signals adjust one or more adjustable circuit elements of an impedance matching circuit, wherein adjustment of the one or more adjustable circuit elements facilitates reducing the impedance mismatch of the guided wave launcher. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, adjusting a matching network utilizing a weighted tuning state resulting in a tuning where the weighted tuning state is determined from applying a weighting factor to multiple tuning states that are predetermined tuning states based on increasing performance associated with types of operation, comparing a measured performance metric to a weighted reference metric resulting in a comparison where the weighted reference metric is determined from applying the weighting factor to multiple reference metrics that are predetermined expected metrics based on the increasing performance associated with the types of operation, and responsive to a first determination that the measured performance metric satisfies a threshold according to the comparison, continuing the tuning utilizing the weighted tuning state. Other embodiments are disclosed.