Abstract: A protective cover with deployable supportive brace includes a housing, a bending member, and a support member. The housing has a receiving opening, and a recessed track. The bending member also has a bent portion, and a guide. The bent portion is received in the receiving opening, and has a first section, and a second section. The guide is received in and movable along the recessed track. The support member is received in the receiving opening, is pivotable relative to the first section, and has two end portions. One end portion is secured to the second section, and the other end portion is adjacent to the first section. When pulled out and deployed, the support member and housing can support the mobile device in a free-standing manner for long term viewing.

Abstract: A device includes a reconfigurable receiver front end having variable gain and variable bandwidth configured to tune to a plurality of communication channels in a communication band, the reconfigurable receiver front end responsive to a signal power level.

Abstract: Disclosed are devices and methods related to radio-frequency (RF) switches having silicon-on-insulator (SOI) field-effect transistors (FETs). In some embodiments, an RF switch can include an FET with shaped source, drain, and gate selected to yield a reduced per-area value of resistance in linear operating region (Rds-on). In some implementations, a plurality of such FETs can be connected in series to allow use of SOI technology in high power RF switching applications while maintaining a relatively small die size.

Abstract: Bias circuit for power amplifier. In some embodiments, a bias circuit for an amplifier can include an input node, an output node, a supply voltage node, and a ground node. The bias circuit can further include a first transistor and a second transistor, with each transistor having a base, a collector, and an emitter. The base, collector and emitter of the second transistor can be coupled to the output node, input node and ground node, respectively. The base and collector of the first transistor can be coupled to the input node and supply voltage node, respectively. The bias circuit can further include a voltage adjustment circuit implemented between the emitter of the first transistor and the output node, and be configured to adjust a voltage at the emitter of the first transistor to a voltage at the output node.

Abstract: In accordance with one or more embodiments, a transmission device includes a receiver configured to receive an interfering signal via an antenna. A transmitter is configured to generate first electromagnetic signals conveying first data. A coupler is configured to generate first guided electromagnetic waves in response to combined electromagnetic signals, wherein the first guided electromagnetic waves propagate, without requiring an electrical return path, along a surface of a transmission medium of a distributed antenna system. A cancellation circuit is configured to generate the combined electromagnetic signals, based on the interfering signal and the first electromagnetic signals, wherein the combined electromagnetic signals mitigate interference by the interfering signal with the first guided electromagnetic waves.

Abstract: Transmission and reception of communications via high frequency antenna systems employing cooled pure copper or high-temperature superconductor filters and/or amplifiers are presented. A comb linear amplifier combiner and comb limiter combiner may be modified with, for example, cryogenically cooled pure copper and/or high-temperature superconductor components, such as matching units of bandpass filters. A computer control unit may be coupled to the transmission circuit and reception circuit to control operation of one or more filters, and/or amplifiers.

Abstract: A mobile electronic device according to an embodiment includes an annunciator that performs notification about an event, and a controller that causes the annunciator to perform the notification about the event when a lifting operation that lifts the mobile electronic device has been detected. A mobile electronic device includes an annunciator performing notification about an event, and a controller causing the annunciator to perform the notification about the event when it is detected that the mobile electronic device has made a transition to a handheld state.

Abstract: A front end circuit includes a bypass circuit comprising a first bypass switch and a second bypass switch configured to bypass a signal to a first terminal according to switching operations of the first bypass switch and the second bypass switch; and an amplifier connected in parallel to the bypass circuit and configured to amplify the signal.

Abstract: A radio receiver has a front end having a shared amplification path for both radio frequency signals and intermediate frequency signals. In one example, the shared amplification path can include a low noise amplifier and an attenuator. By amplifying both radio frequency (RF) signals and intermediate frequency (IF) signals with the same shared amplification path, gains in power efficiency, and reductions in cost and circuit size can be achieved.

Abstract: An interface for inter-chip communication, comprises a transmitter part (TX) for transmitting a differential signal and a receiver part (RX) for receiving the differential signal, the transmitter part (TX) being provided in a first integrated circuit chip (CHIP A) and the receiver part (RX) being provided in a second integrated circuit chip (CHIP B). The transmitter part (TX) comprises a first transistor (Tx1) and a second transistor (Tx2) arranged in a common source configuration, and the receiver part (RX) comprises a third transistor (TR1) and a fourth transistor (TR2) arranged in a common gate configuration. Current flowing in the receiver part (RX) also flows through the transmitter part (TX).

Abstract: Aspects of this disclosure relate to a radio frequency system that includes an envelope generator configured to generate an envelope signal corresponding to an envelope of a radio frequency signal and at least two radio frequency components coupled to the envelope generator. One of the radio frequency components is a radio frequency switch configured to pass the radio frequency signal. The radio frequency switch is configured to receive the envelope signal to cause intermodulation distortion associated with the radio frequency switch to be reduced.

Abstract: The present invention provides a terminal control method and a terminal, and relates to the field of electronic devices. The method includes when a magnetic field sensed by a Hall device of a terminal in a standby state is less than or equal to a first preset threshold, activating a sensor of the terminal, where the Hall device is configured to sense a magnetic field generated by a magnet in a protective case of the terminal. The method also includes obtaining, by using detection data of the sensor, whether the terminal is obstructed, and maintaining the standby state of the terminal when it is obtained that the terminal is obstructed. The method and the terminal provided in the present invention are applied to the terminal.

Abstract: An electronic device and its operating method are provided. The method includes, while a display displays content, identifying, by a first processor, state information of the electronic device using a first sensor based on a first cycle, determining, by the first processor, whether the state information is maintained using the first sensor based on a second cycle, when determining that the state information is maintained based on the second cycle, providing, by the first processor to a second processor, first notification information corresponding to the determination, and changing, by the second processor, a state of the display in response to the first notification information.

Abstract: A monolithic integrated circuit (IC), and method of manufacturing same, that includes all RF front end or transceiver elements for a portable communication device, including a power amplifier (PA), a matching, coupling and filtering network, and an antenna switch to couple the conditioned PA signal to an antenna. An output signal sensor senses at least a voltage amplitude of the signal switched by the antenna switch, and signals a PA control circuit to limit PA output power in response to excessive values of sensed output. Stacks of multiple FETs in series to operate as a switching device may be used for implementation of the RF front end, and the method and apparatus of such stacks are claimed as subcombinations. An iClass PA architecture is described that dissipatively terminates unwanted harmonics of the PA output signal.

Abstract: RF communications circuitry, which includes a first tunable RF filter and a first RF low noise amplifier (LNA) is disclosed. The first tunable RF filter includes a pair of weakly coupled resonators, and receives and filters a first upstream RF signal to provide a first filtered RF signal. The first RF LNA is coupled to the first tunable RF filter, and receives and amplifies an RF input signal to provide an RF output signal.

Abstract: A mixing stage includes a first modulation stage that receives an input signal from a first common node of the mixing stage, a first local oscillator input that receives a local oscillator signal, and a first modulation signal output adapted to provide a first modulated signal. A second modulation stage of the mixing stage includes a second input that receives a phase inverted representation of the input signal from a second common node of the mixing stage, a second local oscillator input that receives the local oscillator signal, and a second modulation signal output adapted to provide a second modulated signal. A current generation circuit provides a supply current to the first common node and to the second common node. A current control circuit is adapted to superimpose an offset current to the current of at least one node of the first common node and the second common node.

Abstract: A tunable filter reduces the total number of filters used in TDD (Time-Division Duplex) communication circuitry. The communication circuitry may include a tunable filter and a first switch associated with the tunable filter. The tunable filter may include a tuning component and a filtering component. The tuning component may be located with the first switch on a first die. The filtering component may be located in a laminate underneath the first switch. Power amplifiers for amplifying transmission signals may be located on a second die, and the second die may be located on the laminate.

Abstract: A parallel amplifier and an offset capacitance voltage control loop are disclosed. The parallel amplifier has a parallel amplifier output, which is coupled to an envelope tracking power supply output via an offset capacitive element. The offset capacitive element has an offset capacitive voltage. The offset capacitance voltage control loop regulates the offset capacitive voltage, which is adjustable on a communications slot-to-communications slot basis.

Abstract: Noise parameters are used to characterize noise performance of linear devices, such as amplifiers. Such noise parameters have not been used for frequency conversion devices, such as mixers. Direct measurements of single-side-band noise figures are accurately represented by the measured noise parameters, which fully characterize the noise figure of the mixers for all harmonic impedance loading conditions. Each harmonic side band of frequencies contributing noise to the mixer output is associated with a set of noise parameters. A measurement method for extracting the noise parameters is described.

Abstract: A MMIC (microwave monolithic integrated circuit) based FET mixer and method for the same is provided. In particular, adjacent transistors, such as FETs (field effect transistors) share terminals reducing physical layout separation and interconnections. A smaller die size is realized with the improved system geometry herein provided.