23results about "Impedence matching networks" patented technology

An input matching circuit and a related apparatus are provided. The input matching circuit includes an inductive branch, a first resistor, and a field-effect transistor, the inductive branch includes one or more inductors and a second resistor, a first end of the first resistor is connected to a signal input end, and a second end of the first resistor is grounded. The signal input end is configured to provide a signal input for the input matching circuit, an input end of the inductive branch is connected to the signal input end, and an output end of the inductive branch is grounded. An inductance value of an equivalent inductor of the inductive branch between the signal input end and the ground varies with adjustment of a frequency of a signal input by the signal input end.

Apparatuses and methods for calibrating adjustable impedances of a semiconductor device are disclosed in the present application. An example apparatus includes a register configured to store impedance calibration information and further includes programmable termination resistances having a programmable impedance. The example apparatus further includes an impedance calibration circuit configured to perform a calibration operation to determine calibration parameters for setting the programmable impedance of the programmable termination resistances. The impedance calibration circuit is further configured to program the impedance calibration information in the register related to the calibration operation.

In one embodiment, an RF impedance matching circuit is disclosed. The matching circuit includes at least one electronically variable capacitor (EVC). Each EVC includes a fixed capacitor, each of the fixed capacitors having a corresponding switching circuit for switching the fixed capacitor into and out of the fixed capacitor to change the total capacitance of the EVC. Each switching circuit includes a switch including a PIN or NIP diode, a driver circuit operably coupled to the switch, a filter operably coupled between the driver circuit and the switch, and a clamp circuit operably coupled between the filter and the switch. The clamp circuit includes a blocking device having a first terminal operably coupled to a clamp power supply and a separate second terminal operably coupled to a terminal of the filter.

The impedance control circuit includes a configuration channel interface, a first resistor, a first transistor, a second transistor, a second resistor, and a third resistor. The configuration channel interface is coupled to a universal serial bus device. A first end of the first resistor is coupled to the configuration channel interface. A first end of the first transistor is coupled to a second end of the first resistor, and a second end of the first transistor is coupled to a system voltage terminal. A first end of the second transistor is coupled to the second end of the first resistor, and a second end of the second transistor is coupled to the system voltage terminal. A first end of the second resistor is coupled to the second end of the first resistor, and a second end of the second resistor is coupled to a control terminal of the second transistor. A first end of the third resistor is coupled to the second end of the second resistor, and a second end of the third resistor is coupled to the system voltage terminal.

The present disclosure discloses a phase shift attenuation circuit, a phase shift attenuation network, and a radio frequency (RF) microwave system. The phase shift attenuation circuit comprises a plurality of first differential circuits electrically connected in sequence; an electrical connection between two adjacent first differential circuits of the plurality of first differential circuits including at least one of a straight-through connection or a connection through an attenuator unit; wherein the phase shift attenuation circuit realizes 8-bit step attenuation through the attenuator unit; 7-bit step attenuation among the 8-bit step attenuation is configured to realize a phase shift function, and the 8-bit step attenuation is configured to realize phase shift and attenuation functions. The phase shift attenuation circuit is constructed based on a differential circuit architecture, and is capable of simultaneously realizing the phase shift and attenuation functions by the same circuit.

A multi-inductor common-ground on-chip millimeter wave single-pole double-throw radio frequency switch is provided. The radio frequency switch includes a first radio frequency port, a second radio frequency port, a third radio frequency port, a first switch arm and a second switch arm. Access points of output matching circuits in the two switch arms are respectively connected with a first compensation inductor and a second compensation inductor. The first compensation inductor, the second compensation inductor, and a first coupling inductor connected with the first radio frequency port are multiplexed to be grounded to a second coupling inductor.

The application discloses a swing enhancement type voltage mode driver and belongs to the technical field of integrated circuits. The driver comprises a driving switch, a controllable matching impedance and a swing enhancement module. The controllable matching impedance is adjusted in resistance value by a single controllable impedance MOS tube and a DAC, and replaces a traditional large-scale MOS array to save area. The swing enhancement module adopts a cascode current source structure, is controlled by the DAC to inject a current, and improves output swing without changing a power supply voltage and without destroying impedance matching. The application is suitable for various characteristic impedance transmission protocols, has stable output common-mode voltage, is suitable for a SERDES chip of 28 nm and below CMOS process, and has the advantages of low power consumption, small area and strong driving capacity.

The application belongs to the technical field of electromagnetic detection, and particularly relates to a self-adaptive multi-frequency resonance matching system and a design method, which comprises a magnetic coupling resonance module and a controllable variable impedance unit connected in series, a switch control capacitor comprising a matching capacitor and a control switch connected in parallel, and a switch control inductor comprising a matching inductor and a control switch connected in series; the magnetic coupling resonance module comprises an inductor and a capacitor connected in parallel, and the capacitor connected in series; the application improves the signal strength of a multi-frequency grounded electromagnetic transmitter, and realizes efficient transmission of a multi-frequency excitation signal.

This application relates to a method for adjusting the output impedance of a radio frequency (RF) remote unit device. The method includes: with the RF remote unit device operating at nominal full power, determining the expected reflected power based on the VSWR (Standing Wave Ratio) of the mismatched load connected to the output of the RF remote unit device and the rated transmit power; converting the power amplifier reflected signal of the RF remote unit device into a digital signal based on the feedback channel of the attenuator, the RF reflection link, and the radio transceiver; acquiring the digital signal through a field-programmable gate array (FPGA) using the high-speed serial interface of the RF remote unit device; determining the initial actual reflected power based on the digital signal using the FPGA; and adjusting the capacitor control voltage of a voltage-controlled capacitor according to the expected reflected power and the initial actual reflected power, thereby adjusting the output impedance of the RF remote unit device. This solution saves on manufacturing costs for mass production of the equipment and improves equipment stability.

The embodiment of the application provides a communication interface circuit and a communication interface, which are applied to a signal sending end and include a power supply end, a terminal impedance unit, a first conduction unit, a second conduction unit and a control signal end. Because the second conduction unit can conduct a path between the signal sending end and a third end of the terminal impedance unit when the power supply end is not powered on or in the power-on process, the potential of the third end of the terminal impedance unit is equal to the potential of the signal sending end, and then the terminal impedance unit can block the current flowing from the signal sending end to the power supply end, thereby preventing the current from flowing backward.

Circuitry (24) is provided that includes a matching circuit (100), a first mixer (50-1) coupled to the matching circuit and configured to receive a signal with an oscillation frequency, a second mixer (50-2) coupled to the matching circuit, a first transmission line path (102-1) coupled between the matching circuit (100) and an input of the first mixer (50-1), and one or more capacitors (104) coupled to the input of the first mixer (50-1) and configured to reject signals at a harmonic frequency of the oscillation frequency. The wireless circuitry (24) can further include a second transmission line path (102-2) coupled between the matching circuit (100) and an input of the second mixer (50-2). The transmission line path can include a first transmission line for conveying signals between the matching circuit (100) and the first mixer (50-1), a second transmission line for conveying signals between the matching circuit (100) and the first mixer (50-1), and a floating transmission line interposed between the first and second transmission lines.

This invention relates to the field of electronic communication connector technology, specifically to a multi-protocol compatible high-speed connector front-end adaptive dynamic impedance matching system. The system includes a signal transmission channel, a tunable dynamic impedance matching module, a signal detection module, a protocol identification unit, and a central control unit. Based on feedback data from the signal detection module, the central control unit calculates the optimal impedance parameters using a simulated annealing algorithm and outputs control signals to the coarse and fine adjustment units. This allows the input impedance of the high-speed connector after connecting a load to be dynamically adjusted within the target range of the corresponding protocol. This addresses the technical problem that existing fixed-impedance connectors cannot simultaneously and perfectly match different protocol standards, and cannot cope with dynamic impedance drift in high-frequency environments.

The application discloses an impedance matching method, device and equipment of a radio frequency power supply system, a storage medium and a computer program product, and relates to the technical field of radio frequency power supply, wherein the method comprises the following steps: obtaining a target value of input impedance of a matching device according to a target value of load impedance of an output end of a radio frequency source and a transmission line model; generating a control instruction according to the target value of the input impedance of the matching device, and sending the control instruction to the matching device. The application realizes high-precision and low-cost impedance matching of the radio frequency power supply system.

Various embodiments of a wireless connector system are described. The system has a transmitter module and a receiver module that are configured to wirelessly transmit electrical energy and / or data via near field magnetic coupling. The wireless connector system is designed to increase the amount of wirelessly transmitted electrical power over a greater separation distance. The system is configured with various sensing circuits that alert the system to the presence of the receiver module to begin transfer of electrical power as well as undesirable objects and increased temperature that could interfere with the operation of the system. The wireless connector system is a relatively small footprint that is designed to be surface mounted.

The application discloses a chip input and output circuit, relates to the technical field of integrated circuits, and comprises a variable impedance transmission circuit, an impedance matching detection circuit and an input and output interface. The application dynamically adjusts the impedance of a transmission path by arranging a variable resistor in the variable impedance transmission circuit and combining the real-time feedback of the impedance matching detection circuit, and does not need to additionally design a peripheral matching circuit. The design saves additional impedance matching elements and wiring on a PCB, reduces material cost and design workload, and significantly reduces the overall design complexity and implementation cost of the system.

This application provides a broadband filtering 180° phase shifter, chip, and device based on magnetically coupled path switching, including an RF input terminal, a magnetically coupled path switchable network, a matching network, and an RF output terminal. The magnetically coupled path switchable network includes a first inductor, second and third inductors forming positive and negative magnetic couplings with it respectively, and first and second transistors connected to the second and third inductors respectively. The matching network includes first and second series matching units and a parallel matching unit. By alternately controlling the transistors to be on and off, the phase shifter exhibits a consistent third-order bandpass response in both the reference state and the phase-shifted state: the first capacitor and the first inductor at the input terminal are connected in parallel to form a first resonator; the off transistor and the connected inductor form a second resonator; the on transistor grounds the corresponding series matching unit, forming a third resonator with the parallel matching unit, and another series matching unit provides inter-stage coupling. This application achieves broadband high-amplitude phase consistency, significantly improving phase-shifting accuracy.

The application discloses a precise equivalent resistance generation method and system based on duty cycle modulation, and the system comprises a main circuit and an auxiliary circuit; the main circuit comprises a test power supply, a low-pass filter, a high-speed electronic switch, a high-precision standard reference resistance and a current acquisition module which are sequentially connected; the auxiliary circuit comprises an analog-digital conversion module ADC, a digital controller and a digital pulse sequence generation unit which are sequentially connected, wherein the digital controller comprises a calibration and compensation module; the digital pulse sequence generation unit is connected with the high-speed electronic switch; the analog-digital conversion module ADC is connected with the current acquisition module; and the current acquisition module is connected with the test power supply. The application can generate an equivalent resistance with continuous resistance value, stepless, high-resolution adjustment, high absolute precision and excellent temperature stability.