92 results about "RF switch" patented technology

Disclosed is a technology related to a low noise amplifier applied between an RF receiver and an RF switch. A phase difference matching circuit having the same phase difference as a positive gain amplifier is added to an output terminal of an attenuator of a low noise amplifier having a variable gain switching structure. In addition, a variable impedance circuit connected to an output terminal of the positive gain amplifier and an output terminal of a phase difference matching unit to finely adjust the phase difference of each output terminal may be further included.

A device useful as a switch including an input waveguide coupled to an output waveguide; a first diode circuit integrated with the input waveguide at a first termination; a second diode circuit integrated with the output waveguide at a second termination; and wherein the biasing the diode circuits switches the switch between an off state and an on state and achieves high isolation in the off state by absorbing input power in, reflecting the input power from, and frequency multiplying the input power using the diodes in the diodes circuits when the input power is received from the input waveguide. In one embodiment, the switch is a tunable, solid-state SPST switch for Gband radar applications.

The invention provides a radio frequency power amplification circuit and an adjusting method thereof. The radio frequency power amplification circuit comprises an image transmission module, a first radio frequency switch, a radio frequency power amplification module, a radio frequency low-noise amplifier, a second radio frequency switch and an antenna module, the radio frequency power amplification module comprises a GaN radio frequency power amplifier, the image transmission module is connected with an RFC of the first radio frequency switch, the GaN radio frequency power amplifier is connected between RF1 channels of the first radio frequency switch and the second radio frequency switch, and the radio frequency low noise amplifier is connected between RF2 channels of the first radio frequency switch and the second radio frequency switch. The antenna module is connected with the RFC of the second radio frequency switch; the two radio frequency switches are configured to control a radio frequency signal transmitted by the image transmission module to flow to the GaN radio frequency power amplifier in a radio frequency transmitting state, and the radio frequency signal is transmitted to the antenna module after being amplified; in the radio frequency receiving state, radio frequency signals received by the antenna module are controlled to flow to the radio frequency low-noise amplifier and are sent to the image transmission module after being amplified. According to the invention, ultra-long distance image transmission of the unmanned equipment can be realized.

This invention provides a radio frequency (RF) switch circuit and module. The RF switch circuit includes a first resistor and stacked switching units. Each stacked switching unit comprises multiple stages of stacked field-effect transistor (FET) circuits connected in series. Each stage of the stacked FET circuit includes a FET, a second resistor, and a bootstrap unit, which includes one or two bootstrap circuits. The bootstrap unit in each stage of the stacked FET circuit is used to raise the gate voltage of the corresponding FET during electrostatic discharge (ESD) to assist in turning on the FET and allowing the ESD current to be discharged through the path formed by the FET. This invention can prevent gate oxide breakdown or thermal damage caused by localized overheating of the FET acting as a switch during an ESD event in the RF switch circuit, thereby improving the stability of the RF switch circuit.

This invention provides an unmanned aerial vehicle (UAV) image transmission system and image transmission method. The system includes: a radio frequency (RF) transceiver, a balanced amplifier circuit, a low-noise amplifier, and an RF switch. The balanced amplifier circuit includes at least two parallel power amplifiers configured to superimpose the amplified signals from each power amplifier in phase to synthesize the output power. The RF transceiver generates a time-division duplex control signal to synchronously control the switching of each component between transmit and receive modes. By employing a balanced amplifier circuit, this invention enables each power amplifier to operate in a region with better linearity, thereby improving transmit power while ensuring the signal quality required for high-order modulation, thus balancing long-distance transmission and high-definition image quality.

An apparatus of a radio unit (RU) may include a radio frequency (RF) switch selectively connected to an uplink path or a downlink path for time division duplex (TDD); at least one processor; and a memory including instructions. When executed individually or collectively by the at least one processor, the instructions may cause the apparatus to: receive a control plane message from a distributed unit (DU) within a downlink receive window; obtaining a segment for downlink scheduling based on data direction information and a segment type indicator of a generic header of the control plane message; and changing a path to which the RF switch is connected from an uplink path to a downlink path on the basis of the segmented command for increasing the symbol number and information for indicating the number of symbols.

This invention provides an automated testing device for UAV data links, including an industrial control computer, a display, a spectrum analyzer, a programmable DC power source, a programmable adjustable attenuator, a fixed attenuator I, a fixed attenuator II, a power divider I, a power divider II, an RF switch, a shielded box I, and a shielded box II. The software of the industrial control computer includes a system management module and an automated testing module. The advantages of this invention are: it uses general-purpose testing equipment, is based on a computer-automated program, and controls the settings of each testing device via a bus to simulate remote control, telemetry, image data transmission and reception, and bit error rate statistics; it achieves automated testing of core functional performance indicators of UAV data links such as power consumption, transmit power, spectrum, functionality, receiver sensitivity, bit error rate, and latency.

Embodiments described herein include radio frequency (RF) switches. Generally, embodiments described herein selectively bias an output of one or more switch transistors in the RF switch. Such coupling can provide a bias that significantly reduces gate lag effects. In one embodiment, the RF switch includes an antenna node, a first input / output (I / O) node, a second I / O node, a field effect transistor (FET), a FET stack, and a bias coupling circuit. In this embodiment, the bias coupling circuit electrically couples a gate terminal of the FET to one or more FET output terminals of the FET stack to provide a bias voltage to the one or more output terminals.

An improved architecture for a radio frequency (RF) power amplifier, impedance matching network, and selector switch. One aspect of embodiments of the invention is splitting the functionality of a final stage impedance matching network (IMN) into two parts, comprising a base set of off-chip IMN components and an on-chip IMN tuning component. The on-chip IMN tuning component may be a digitally tunable capacitor (DTC). In one embodiment, an integrated circuit having a power amplifier, an on-chip IMN tuner, and a selector switch is configured to be coupled to an off-chip set of IMN components. In another embodiment, an integrated circuit having an on-chip IMN tuner and a selector switch is configured to be coupled through an off-chip set of IMN components to a separate integrated circuit having an RF power amplifier.

This application proposes a microwave RF switch design method, device, and storage medium based on analytical mechanics. The method includes: acquiring switch specification information, multi-band performance constraint information, and technical platform constraint information; constructing an analytical mechanics model using scalar functions or scalar functionals; optimizing the analytical mechanics model based on the switch performance constraint information; inputting the switch specification information, multi-band performance constraint information, and technical platform constraint information into the optimized analytical mechanics model to output switch parameters that satisfy the multi-band performance constraint information; and generating design specifications for the microwave RF switch based on the switch parameters. Based on this, this application uses an analytical mechanics model to collaboratively design microwave RF switches by integrating multi-band performance constraints and technical platform constraints with switch performance. This leverages cross-band and technical platform synergy optimization to achieve cross-band switch performance trade-offs, ensuring that the microwave RF switch has optimal performance indicators.

1. Name of this product design: Radio Frequency Test Head. 2. Purpose of this design: To be installed on a test fixture for testing the conversion of an RF coaxial connector into an RF switch connector. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The invention provides a radio frequency switch interface multiplexing circuit which is applied to an interface circuit of an integrated circuit. The Schmitt trigger circuit comprises a plurality of first Schmitt triggers, a plurality of second Schmitt triggers and a charge pump module. The first Schmitt triggers are used for processing MIPI signals, and the input end of each first Schmitt trigger is connected with an external input voltage, so that the radio frequency switch works in an MIPI working mode by controlling the level of the external input voltage. And the second Schmitt trigger is used for processing the GPIO signal and is powered by the charge pump module. Since the first Schmitt trigger and the second Schmitt trigger are powered by different power supplies, the radio frequency switch chip for processing the MIPI signal and the radio frequency switch chip for processing the GPIO signal can be integrated only by changing the level of the external input voltage, false triggering can be avoided, and the reliability of the radio frequency switch chip is improved. And finally, the practicability is improved, and the application is wider.

This invention relates to the field of wireless communication technology, and provides a positive charge pump reset circuit and an RF switch chip. The circuit includes a low-dropout linear regulator, a positive charge pump, and a first capacitor. The input terminal of the low-dropout linear regulator is connected to a power supply, and its output terminal outputs a power supply voltage to the input terminal of the positive charge pump. The output terminal of the positive charge pump is used to boost the power supply voltage to a preset value to output a positive voltage. The first terminal of the first capacitor is connected to the output terminal of the positive charge pump, and its second terminal is grounded. The positive charge pump reset circuit also includes a reset circuit, whose input terminal is connected to either the input terminal or the output terminal of the positive charge pump. The reset circuit is used to reset the positive charge pump voltage when the received output voltage is greater than the preset value. The positive charge pump reset circuit of this invention has a fast charge reset speed and high reliability.

This invention discloses an adaptive dual-mode direction backtracking system based on double frequency conversion, comprising a radio frequency (RF) circuit, a control circuit, a local oscillator (LOO), and an antenna array. The RF circuit amplifies, filters, and mixes the RF signals received by the antenna array to form signal transmission links in mixed-mode and Van Atta array modes. The control circuit provides unified control over the RF switches and the transmit / receive delays of each channel, and outputs control signals according to the operating mode switching requirements. The LEO generates and distributes a fixed LEO signal and an adaptive LEO signal to achieve frequency matching under different incoming wave frequencies. The antenna array receives external incoming wave signals and transmits direction backtracking signals, employing an adjacent transceiver unit interconnection method in mixed-mode and a centrally symmetrical array element interconnection method in Van Atta array mode. This invention enables stable direction backtracking under different incoming wave frequencies and different application scenarios.

A magnetic resonance imaging (MRI) system includes a plurality of gradient coils positioned about a bore of a magnet. The MRI system also includes a radio frequency coil assembly. The MRI system also includes an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to the RF coil assembly to acquire MRI images of a subject within the bore. The at least one component of the MRI system is manufactured with microstructures having a braided configuration. The microstructures are configured to cancel out eddy currents that are induced in the at least one component by a magnetic field when the MRI system is utilized.

A radio frequency (RF) switch employing differential signal cancellation is disclosed. The differential RF switch enables high isolation and extremely small size by employing cascode current steering within a differential switching amplifier. Unlike series RF switches, isolation with the differential RF switch is limited by device mismatch, not switch parasitic capacitance, enabling high frequency operation. Since the differential RF switch can be placed within the already present cascode devices, there is no additional insertion loss from the switch.

This application relates to an omnidirectional three-dimensional beam-controlled reconfigurable smart surface system and a beam alignment method. Different operating modes correspond to one or more system units, each including a Luneburg lens, a hemispherical antenna array, and a reconfigurable RF switch circuit. During the sensing phase, the reconfigurable RF switch circuit determines the optimal receiving antenna unit and the optimal transmitting beam angle between the system and the signal source based on the signals received by each antenna unit, thus achieving beam alignment. During the relay phase, the optimal receiving antenna unit receives the signal transmitted by the signal source at the optimal beam angle and transmits the signal to the target direction through other antenna units. This application, while maintaining simple hardware and control logic, eliminates the scanning loss of traditional planar RIS at large angles, achieves omnidirectional high-gain coverage with an ultra-large field of view greater than ±80°, and supports in-situ power measurement, effectively solving the coverage dead zone problem in high-frequency wireless communication networks.

A method of manufacturing a layered structure 24 e.g., an RF switch, comprising growing an epitaxial layer 28 on a substrate 26, wherein the epitaxial layer has a first resistivity R1 near the substra

The invention discloses a Ka wave band bidirectional amplifier chip circuit. The circuit comprises a radio frequency switch circuit model, a low noise amplifier circuit model and a power amplifier circuit model. The radio frequency switch circuit is provided with an input port and two output ports which are respectively connected to the input ends of the low noise amplifier and the power amplifier, and half-duplex communication is realized by switching a receiving mode and a transmitting mode through a control signal. The radio frequency switch circuit adopts an asymmetric MOS stacked series-parallel structure, and low insertion loss and high isolation are realized through parallel inductors and short circuit branches; the low-noise amplifier adopts a three-level inductor distributed structure, and inductors are connected in series at a source electrode to realize negative feedback; and the power amplifier adopts a two-stage high-power Cascode structure. According to the method, the element-level model is established based on a circuit physical working mechanism, the linear / nonlinear electrical performance of the transceiving system can be accurately represented, the simulation efficiency is remarkably improved, and an effective simulation precondition is provided for a large complex network system.

This application provides a radio detection method and system for unmanned aerial vehicles (UAVs), belonging to the field of UAV technology. The method includes: dividing the airspace to be detected into multiple scanning areas based on the refresh rate requirements of the airspace; receiving full-band radio frequency (RF) signals from the multiple scanning areas using an antenna array to obtain raw RF signals; cyclically switching the raw RF signals using an RF switch array to obtain a time-sequentially processed signal; preprocessing and extracting frequency domain features from the time-sequentially processed signal to obtain target RF features; adjusting the cyclic switching period and gain parameters of the RF switch array based on the target RF features using an intelligent switching strategy constructed based on signal strength feedback, and calculating the direction of arrival and distance of the detected target based on an amplitude ratio direction-finding algorithm; and determining the position and trajectory of the detected target by analyzing the target RF features over a preset continuous period. This application improves the accuracy of UAV detection.

The present disclosure is directed to conductive structures that may be utilized in a radio-frequency (RF) switch. The embodiments of the conductive structures of the present disclosure are formed to balance the “on” resistance (Ron) and the “off” capacitance (Coff) such that the Ron·Coff value is optimized such that the conductive structures are relatively efficient as compared to conventional conductive structures within conventional RF switches. For example, the conductive structures include various metallization layers that are stacked on each other and spaced apart in a selected manner to balance the Ron and the Coff as to optimize the Ron·Coff figure of merit as a lower Ron·Coff is preferred.

This invention discloses a low-noise amplifier for suppressing switching glitches, belonging to the field of communication technology. It mainly consists of a bias circuit, an input matching circuit, a Cascode amplifier, an output matching circuit, an RF switch, a transmit / receive switching control network, and an output switch logic control network. During TDD transmit / receive switching, the amplifier generates glitches. By adding an RF switch at the amplifier output, this invention achieves suppression of amplifier switching glitches through timing control via transmit / receive switching control logic and RF switch control.

Methods and devices used to cancel non-linear capacitances in high power radio frequency (RF) switches manufactured in bulk complementary metal-oxide-semiconductor (CMOS) processes are disclosed. The methods and devices are also applicable to stacked switches and RF switches fabricated in silicon-on-insulator (SOI) technology.

A system and method for power control based antenna switching control mechanism is provided. The system includes a plurality of antenna modules arranged in a daisy chain configuration. The plurality of antenna modules is configured to receive a control signal having an input voltage (V in ) and a radio frequency (RF) signal from a radio frequency identification (RFID) reader via a communication line. Each antenna module includes an antenna element and at least one radio frequency (RF) switch configured to couple the antenna element with the RFID reader based at least on a comparison of the input voltage (V in ) to a threshold voltage (V th1 ) and a threshold voltage (V th2 ), wherein the at least one RF switch is configured to either (1) allow communication with the antenna module in a connected state or (2) pass the control signal to a next antenna module in a pass-through state.

This invention relates to the field of radio frequency (RF) switch technology, and discloses a power selection circuit, RF switch, and RF chip compatible with single and dual-pin control. The power selection circuit includes MOSFETs P1, P2, P3, and N1. The source of MOSFET P1 is electrically connected to the gates of MOSFETs P2, P3, and N1, respectively, for inputting a first external signal. The gate of MOSFET P1 is electrically connected to the drains of MOSFETs P3 and N1, respectively, and the source of MOSFET N1 is grounded. The drain of MOSFET P1 is electrically connected to the drain of MOSFET P2, for outputting a voltage VDD_INT. The source of MOSFET P2 is electrically connected to the source of MOSFET P3, for inputting a second external signal. In practical use, the power selection circuit of this invention can output a voltage VDD_INT regardless of whether a single-pin or dual-pin control input is used, thus meeting the power supply requirements of both control methods.

This invention relates to an automatically adjustable radio frequency (RF) attenuation circuit. It includes a detector unit, an RF switch, and an attenuation unit. The detector unit outputs a control voltage based on the magnitude of the input RF signal, driving the RF switch and attenuation unit to automatically switch between multiple attenuation levels. The attenuation unit is constructed using a π-type resistor network and switching diodes, with input and output voltage standing wave ratios (VSWRs) both less than 1.3. This invention requires no external control and can automatically adjust the attenuation based on the input signal amplitude. It is suitable for high-frequency and small-signal scenarios and has the advantages of low cost and stable performance.

A compact portable quantum sensor device consists of a very high efficiency RF antenna, a low power RF signal generator, an RF amplifier (if needed), an RF switch and isolator, a photodetector(s) with amplifier circuit, various optical components, a microcontroller, a Bluetooth communication board, a battery, a display, and control software and machine learning algorithms for noise reduction and data analysis. A battery-operated portable quantum sensor device prototype was built for magnetometry applications. A second prototype with a smaller sensor head footprint was also built for brain imaging through measuring magnetic fields induced by brain neuron action potentials. In a third photonic circuit approach, all of the optical and electronic components are integrated on the same chip.

A switch control circuit of an RF switch circuit is provided. The switch control circuit includes a decoder configured to output first and second command signals; a first driver configured to generate a first switching control signal having a turn-on voltage or turn-off voltage in response to the first command signal, and output the first switching control signal to a first switch; a delay cell configured to delay the second command signal; a logic gate configured to generate a third command signal through a logical operation performed on the second command signal and the delayed second command signal; and a second driver configured to generate a second switching control signal having a turn-on voltage or a turn-off voltage in response to the third command signal, and output the second switching control signal to a second switch connected between the first port and ground or between the second port and ground.

The invention belongs to the technical field of mobile communication, and particularly relates to a communication mode switching method for a radio frequency subsystem of a mobile communication terminal. The method comprises the following steps: a radio frequency subsystem of the mobile communication terminal enters a sleep state from a current working state in a current communication mode, and a non-core module is closed; immediately starting a 26M clock and frequency synthesizer circuit in a target mode; configuring a radio frequency switch parameter and a transceiver parameter of the target communication mode, and switching a radio frequency subsystem of the mobile communication terminal to a receiving state of the target communication mode; activating a receiving channel in the target mode and performing index measurement; returning or residing after the measurement is finished; the static power consumption of the radio frequency subsystem is obviously reduced, the power consumption waste of an invalid circuit is avoided, and the communication performance is ensured while the cruising ability of the terminal is improved.

This application discloses a radio frequency (RF) front-end circuit and an RF front-end module. The RF front-end circuit includes a first filter module, a second filter module, a third filter module, a resonant module, and an RF switch. The RF switch has an antenna terminal, a first terminal, a second terminal, and a third terminal. The first filter module is connected to the first terminal, the second filter module is connected to the second terminal, and the third filter module is connected to the third terminal. The resonant module is connected between the first filter module and the first terminal of the RF switch. The resonant module in this application can prevent second-band RF signals from entering the first transmission path, thereby effectively avoiding signal crosstalk and ensuring normal transmission of RF signals. In addition, the resonant module can also prevent third-band RF signals from entering the first transmission path, thereby effectively avoiding signal crosstalk.