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211 results about "Dynamic impedance" patented technology

Dynamic impedance is the slope of the voltage vs current curve. For example, with a diode, You might have a voltage of 0.6V and a current of 1mA.

Tunable microwave devices with auto-adjusting matching circuit

An embodiment of the present invention provides an apparatus, comprising an input port and a dynamic impedance matching network capable of determining a mismatch at the input port and dynamically changing the RF match by using at least one matching element that includes at least one voltage tunable dielectric capacitor. The matching network may be a “Pi”, a “T”, or “ladder” type network and the apparatus may further comprise at least one directional coupler capable of signal collection by sampling a portion of an incident signal, a reflected signal or both. In an embodiment of the present invention, the apparatus may also include a control and power control & logic unit (PC LU) to convert input analog signals into digital signals and sensing VSWR phase and magnitude and processing the digital signals using an algorithm to give it a voltage value and wherein the voltage values may be compared to values coming from the coupler and once compared and matched, the values may be passed to a Hi Voltage Application Specific Integrated Circuit (HV ASIC) to transfer and distribute compensatory voltages to the matching network elements.
Owner:NXP USA INC

Microwave array applicator for hyperthermia

Apparatus (10) for treating skin tissue with microwave radiation (e.g. having a frequency of 1 GHz to 300 GHz) is disclosed in which an array of radiating elements (18), e.g. patch antennas are arranged on a flexible treating surface (16) for locating over and conforming with a region of skin tissue (24) to be treated. The radiating elements (18) receive microwave energy from a feed structure and are configured to emit outwardly a electromagnetic field which permits the region of skin to a substantially uniform penetration depth. Each radiating element (18) may have an independently controllable power supply to permit relative adjustment of the field across the treatment surface. Each radiating element may have a monitoring unit to allow adjust based on detected reflected power. Each independently controllable power supply may include a dynamic impedance matching unit.
Owner:UNIV OF WALES BANGOR

Tunable microwave devices with auto-adjusting matching circuit

An embodiment of the present invention provides an apparatus, comprising an input port and a dynamic impedance matching network capable of determining a mismatch at the input port and dynamically changing the RF match by using at least one matching element that includes at least one voltage tunable dielectric capacitor. The matching network may be a “Pi”, a “T”, or “ladder” type network and the apparatus may further comprise at least one directional coupler capable of signal collection by sampling a portion of an incident signal, a reflected signal or both. In an embodiment of the present invention, the apparatus may also include a control and power control & logic unit (PC LU) to convert input analog signals into digital signals and sensing VSWR phase and magnitude and processing the digital signals using an algorithm to give it a voltage value and wherein the voltage values may be compared to values coming from the coupler and once compared and matched, the values may be passed to a Hi Voltage Application Specific Integrated Circuit (HV ASIC) to transfer and distribute compensatory voltages to the matching network elements. Additional embodiments are disclosed.
Owner:NXP USA INC

Dynamic real-time calibration for antenna matching in a radio frequency transmitter system

Real-time calibration of a tunable matching network that matches the dynamic impedance of an antenna in a radio frequency transmitter system. The radio frequency transmitter system includes two non-linear equations that may be solved to determine the reflection coefficient of the antenna. The tunable matching network is repeatedly perturbed and the power reflected by the antenna is measured after each perturbation at the same node within the tunable matching network. The power values are used by an optimizer in converging to a solution that provides input impedance of the antenna. The elements of the matching circuit are adjusted to match the input impedance of the antenna.
Owner:MALIKIE INNOVATIONS LTD

Dynamic impedance compensation circuit and method

An impedance compensation circuit and method for an input / output buffer provides dynamic impedance compensation by using programmable impedance arrays and a dynamically adjustable on-chip load. Accordingly, among other advantages, only a single off-chip or external calibrated impedance resistor is used and only a single test pad is necessary.
Owner:ATI TECH INC

Spectral resistor, spectral capacitor, order-infinity resonant tank, EM wave absorbing material, and applications thereof

A spectral resistor based on the constitute law of “elasticity of electricity” derived from the Riemann-Lebesgue lemma is provided to build a substantial order-∞ resonant tank. The substantial order-∞ resonant tank according to embodiments of the present invention can function as many different roles such as an electric filter, a harmonic and sub-harmonic power waveform distortion filter, a dynamic damper, a dynamic impedance matching circuit and a kind of electromagnetic wave absorbing material. By attaching an order-∞ resonant tank according to the present invention to an ordinary system with equivalent inductance in a suitable topology as an electric filter, a substantial snubber network, or so-called DeLenzor, is obtained. The duality of an electric system can be handled by coupling the system with an order-∞ resonant tank according to the present invention, and thus the disadvantageous effects caused by the duality of the system can be canceled immediately without any drawbacks. Furthermore, the reactive (or so-called regenerated) power caused by the duality of the electric system can be recycled according to embodiments of the present invention.
Owner:CHANG MING HOO +3

Matching device and matching method for ultrasonic power supply

The invention discloses a matching device and matching method for an ultrasonic power supply. The matching device for the ultrasonic power supply comprises an ultrasonic signal generator, a drive isolation circuit, an ultrasonic power amplification circuit, a matching transformer, a tuning inductor, an ultrasonic transducer, a voltage sampling circuit, a current sampling circuit, a filtering and shaping circuit, a phase discriminator, an A / D converter, a single-chip microcomputer and a stepping motor. The output end of the matching transformer is connected with the tuning inductor; the output end of the tuning inductor is connected with the ultrasonic transducer; the voltage sampling circuit is used for collecting real-time working voltage signals at the two ends of a unit formed by the tuning inductor and the ultrasonic transducer, and transmitting the real-time working voltage signals to the phase discriminator. According to the matching device and matching method for the ultrasonic power supply, static impedance matching and dynamic impedance matching can be achieved, the matching inductance value can be tracked and adjusted through the phase difference of working currents and working voltages of the ultrasonic transducer, it can be ensured that the ultrasonic transducer always works at a resonance point, the maximum useful power output of the ultrasonic transducer can be achieved, in addition, the adjusting response speed is high, and accuracy is high.
Owner:HOHAI UNIV CHANGZHOU

Magnetic carrier, two-component developer and image forming method

A magnetic carrier having magnetic carrier particles each containing at least a magnetic core particle and a resin; the magnetic carrier having a resistivity of from 1.0×106 Ω·cm or more to 1.0×1010 Ω·cm or less at an electric-field intensity of 1.0×103 V / cm as found by measuring dynamic impedance; electric-field intensity E(109) at which the resistivity of the magnetic carrier comes to 1.0×109 Ω·cm being 2.0×104 V / cm or less, and electric-field intensity E(108) at which the resistivity of the magnetic carrier comes to 1.0×108 Ω·cm being from 5.0×103 V / cm or more to 2.8×104 V / cm or less; and the electric-field intensity E(108) and the electric-field intensity E(109) being in a ratio, E(108) / E(109), of from 1.0 or more to 5.0 or less.
Owner:CANON KK

System and method for dynamic impedance matching

An integrated circuit provides dynamic, on chip resistor trimming, including a digital control loop for stabilizing impedance matching among multiple devices communicatively linked over a data transmission line. The digital control loop stabilizes input / output impedance matching of various devices to within a precise ohmic range that is far narrower than standard process variations, such as sheet resistance, within the components themselves. The impedance matching circuit also overcomes EMI problems normally associated with digital control and thus provides dynamic on-chip digital control without non-linearity and with tighter tolerance than is presently possible. Accordingly, the circuit boosts performance of peripheral devices that communicate over a standard USB port, without the need for a computer as a go between or intermediate interface. This makes device to device communication possible as between USB On-the-Go capable devices.
Owner:TAKLA NABIL

Resonant circuit tuning system with dynamic impedance matching

A resonant circuit tuning system and a method for tuning are provided. The resonant circuit tuning system may include a resonant circuit having a first capacitive element in series between a transmitter and an antenna coil and a second capacitive element in parallel with the transmitter and the antenna coil. At least one of the first capacitive element and second capacitive element may be configured to be varied. The resonant circuit tuning system also may include a controller for controlling a variable value of at least one of the first and second capacitive elements.
Owner:TYCO FIRE & SECURITY GMBH

Time domain reflectometer touch screen sensor

TDR (time domain reflection) technology may be used in optical domain or in electrical domain. For electrical TDR, single layer ITO glass may form a transmission line as a base TDR touch sensor. When the touch sensor is paired, the existing internal metal line of the display device may be reused as a TDR sensor and the ITO glass may be removed. When touched, the TDR profile is changed dynamically from baseline to the particular profile due to its dynamic impedance profile change across the display screen. Likewise, for optical TDR touch sensing, 2 dimensional optical slab waveguide is used to carry OTDR signal. When touched, the profile is changed due to this perturbation mainly by evanescent field changes on that particular position.
Owner:KIM KIHONG JOSHUA

Method and system for characterizing cardiac function based on dynamic impedance

ActiveUS20140276125A1ElectrocardiographyEvaluation of blood vesselsElectricityCardiac function curve
A method and system are provided for characterizing cardiac function. The method and system comprise collecting cardiac signals associated with electrical or mechanical behavior of a heart over at least one cardiac cycle; identifying a timing feature of interest (FOI) from the cardiac signals; collecting dynamic impedance (DI) data over at least one cardiac cycle (CC), designated by the timing FOI, along at least one of i) a venous return (VR) vector or ii) a right ventricular function (RVF) vector; and analyzing at least one morphologic characteristic from the DI data based on at least one of i) a VR-DI correlation metric to obtain a VR indicator associated with the CC or ii) a RVF-DI correlation metric to obtain a RVF indicator associated with CC.
Owner:PACESETTER INC

Resonant circuit tuning system with dynamic impedance matching

A resonant circuit tuning system and a method for tuning are provided. The resonant circuit tuning system may include a resonant circuit having a first capacitive element in series between a transmitter and an antenna coil and a second capacitive element in parallel with the transmitter and the antenna coil. At least one of the first capacitive element and second capacitive element may be configured to be varied. The resonant circuit tuning system also may include a controller for controlling a variable value of at least one of the first and second capacitive elements.
Owner:SENSORMATIC ELECTRONICS CORP

Dynamic real-time calibration for antenna matching in a radio frequency receiver system

This disclosure relates to real-time calibration of a tunable matching network that matches the dynamic impedance of an antenna in a radio frequency receiver system. The radio frequency receiver system includes two non-linear equations that may be solved to determine the reflection coefficient of the antenna. Control system that calculates, in realtime, a value of an input impedance of the antenna to match a load in a receiver system, wherein said impedance is calculated directly using a closed-form solution. The reflection coefficient of the antenna may be used to determine the input impedance of the antenna. The elements of the matching circuit are then adjusted to match the input impedance of the antenna.
Owner:MALIKIE INNOVATIONS LTD

Microwave and RF ablation system and related method for dynamic impedance matching

An electrosurgical system and method for performing electrosurgery is disclosed. The electrosurgical system includes an electrosurgical generator adapted to supply electrosurgical energy to tissue. The electrosurgical system includes an electrosurgical instrument, such as an electrosurgical antenna, knife, forceps, suction coagulator, or vessel sealer. The disclosed system includes an impedance sensor, a controller, dynamic impedance matching network, and an electrosurgical energy generator. The dynamic impedance matching network includes a PIN diode switching array configured to selectively activate a plurality of reactive elements. The disclosed arrangement of reactive elements provides real-time impedance correction over a wide range of impedance mismatch conditions.
Owner:TYCO HEALTHCARE GRP LP

Plasma production device and method and RF driver circuit with adjustable duty cycle

A reactive circuit is disclosed as part of a method and system for generating high density plasma that does not require the use of a dynamic matching network for directly driving a plasma exhibiting a dynamic impedance. The reactive network is designed to provide a small total reactance when the plasma reactance is at a first plasma reactance and presents a reactance that does not exceed a specified limit at a second plasma reactance. The first and second plasma reactance span a substantially fraction of an expected dynamic plasma reactance range. The first and second plasma reactance values may, for example, correspond to a high expected plasma reactance limit and a low expected plasma reactance limit respectively or the first plasma reactance may correspond to an average expected plasma reactance.
Owner:LAM RES CORP

Lithium battery dynamic impedance parameter identification method based on equivalent circuit model

A lithium battery dynamic impedance parameter identification method based on an equivalent circuit model is disclosed. Firstly, a charge / discharge system is made based on a first order RC equivalent circuit; a charge / discharge test on a to-be-tested lithium battery is carried out according to the charge / discharge system; and test data is obtained, and parameters are extracted. According to the invention, online estimation of dynamic internal resistance of a lithium battery in different charged states and charge / discharge conditions can be conducted, and a battery module which is simple and practical can be obtained on the basis. The invention takes correlation of impedance and charge / discharge current into consideration, improves the accuracy of lithium battery impedance parameter extraction, provides a simple and feasible charge / discharge test method and a specific parameter extraction algorithm, and has high practical operability.
Owner:NAT UNIV OF DEFENSE TECH

Method and system for lna adjustment to compensate for dynamic impedance matching

Aspects of a method and system for LNA adjustment to compensate for dynamic impedance matching are provided. In this regard, an antenna matching network may be configured to maximize received signal strength for a determined frequency and an amplifier gain may be adjusted based on the maximized signal strength such that output levels of the amplifier are between specified limits. The antenna matching network may be programmatically controlled via one or more switching elements. The amplifier gain may be programmatically controlled via one or more bias points. The antenna matching network may be configured for a plurality of frequencies in a frequency band, such as an FM broadcast band, and a configuration for each frequency may be stored. Accordingly, when the receiver is tuned to a frequency, a corresponding configuration may be retrieved from memory.
Owner:BROADCOM CORP

Method and apparatus for dynamically matching impedance

InactiveUS6973183B1Facilitate dynamic impedance matchingReduce or eliminate at least some of the shortcomingsMultiple-port networksInterconnection arrangementsControl signalDynamic impedance
In one aspect of the invention a communication device including circuitry operable to facilitate dynamic impedance matching includes an image impedance operable to be coupled to a receiver / transmitter pair associated with a line impedance. The device also includes matching circuitry coupled to the line impedance and the image impedance, the matching circuitry operable to measure an impedance mismatch between the line impedance and the image impedance and to generate a control signal based on the measured impedance mismatch. The image impedance is operable to be varied to more closely match the line impedance based at least in part on the control signal.
Owner:SAGEMCOM BROADBAND

Active implantable medical device including means for the evaluation of intracardiac volume

An active implantable medical device having a plurality of connection terminals able to be connected to electrodes placed in at least three distinct respective sites in a myocardium; circuits for measuring an intracardiac bio-impedance, comprising circuits for injecting a current and circuits for collecting a voltage at respective poles of a configuration of said connection terminals, and circuits able to deliver at an output a dynamic impedance signal that is a function of the injected current and the collected voltage; and circuits for evaluating an intracardiac volume, receiving at in input the impedance signal and delivering at an output a dynamic value of volume representing an instantaneous absolute value of intracardiac volume.
Owner:ELA MEDICAL

Dynamic impedance compensation circuit and method

An impedance compensation circuit generates per-group pull-up impedance information and per-group pull-down impedance information to calibrate a plurality of input / output pads and dynamically updates impedance information on a per channel basis. A group refers to a group of I / O pads having similar output drive strengths in a channel. A channel refers to all I / O pads, which collectively provide a bus interface to an external device. For example, all the I / O pads interfacing with a memory module may be grouped into a channel, and address I / O pads in a channel may be arranged into a “group.” Memory I / O pads may be grouped together into a channel since memory interface pads have input / output characteristics that may be different from those of other types of I / O pads in the chip. According to one embodiment, per-group programmable offset information provides calibration information that may be different for each group in each channel.
Owner:ATI TECH INC

Dynamic Impedance Matching Network and Method for Matching an Impedance Between a Source and a Load

An impedance matching network includes an impedance matching circuit for dynamically matching an impedance between a source and a load. Matching is done by varying the real part and the imaginary part of the impedance of the impedance matching circuit independently.
Owner:QUALCOMM TECHNOLOGIES INC
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