58results about How to "Eliminate impedance" patented technology

The present invention is an RF filter that translates impedances of an IF circuit to create a filter with an RF center frequency having the high Q roll-off characteristics of an IF filter. The RF filter is self-aligned with the frequency of an RF local oscillator. The RF filter has an impedance divider, which is formed by coupling an RF impedance circuit to a translated IF impedance circuit. The translated IF impedance circuit includes an RF passive mixer and an IF impedance circuit. The mixer translates the impedance of the IF impedance circuit by mixing an RF input signal with an RF local oscillator signal, which determines the RF center frequency. Filtered RF signals may be provided by the impedance divider. Filtered IF signals may be provided by the IF impedance circuit. To effectively translate and preserve the IF impedance characteristics, the IF impedance circuit presents a high impedance at harmonics of the RF local oscillator signal.

An electromagnetic composite metamaterial including an electromagnetic medium and a plurality of spaced electromechanical resonators disposed in or on the electromagnetic medium configured to control electromagnetic wave propagation properties in the electromagnetic composite metamaterial.

An electromagnetic composite metamaterial including an electromagnetic medium and a plurality of spaced electromechanical resonators disposed in or on the electromagnetic medium configured to control electromagnetic wave propagation properties in the electromagnetic composite metamaterial.

A programmable gain low noise amplifier includes a tail current transistor (Q3) having a source coupled to a first reference voltage (VDD) and a drain coupled to a tail current conductor (18) and, in a differential input embodiment, a plurality of pairs (Q4,5, Q7,8, Q10,11, Q13,14) of differentially coupled input transistors. Each pair includes a first input transistor having a gate coupled to a first input conductor (19A) and a drain coupled to a first output conductor (26A) and a second input transistor having a gate coupled to a second input conductor (19B), a source coupled to a source of the first transistor, and a drain coupled to a second output conductor (26B). The sources of the first and second input transistors of some or all of the pairs are selectively coupled to the tail current conductor (18) in it response to corresponding gain control signals (B1,2,3).

The invention discloses a power amplifier output matching circuit, a radio frequency front-end module and a wireless device. The power amplifier output matching circuit is used for being connected with a first power amplifier output and a second power amplifier output of a push-pull power amplifier output stage, and comprises a load balun, a first blocking circuit, a second blocking circuit, a first feed circuit and a second feed circuit; a main coil of the load balun is provided with a first balun input and a second balun input; the first balun input is connected with the first power amplifier output through the first blocking circuit, and the first balun input is connected with the first power amplifier output through the first feed circuit; the second balun input is connected with the second power amplifier output through the second blocking circuit, and the second balun input is connected with the second power amplifier output through the second feed circuit. The circuit can effectively eliminate the influence of parasitic inductance on load line impedance and load line insertion loss, and guarantees the output power and power conversion efficiency of the push-pull power amplifier.

A socket terminal includes front and rear terminals. The front terminal includes a front contact-point portion that wipes off foreign material adhered to a terminal surface of a plug terminal. The rear terminal includes a rear contact-point portion that contacts the terminal surface wiped by the front contact-point portion. The socket terminal also includes a movable portion between a circuit-board connection portion and circuit board. The movable portion cancels a reduction in impedance of at least the front terminal and rear terminal for a transmission signal flowing from the circuit-board connection portion connected to the circuit board. This can provide a socket terminal allowing the rear contact-point portion to contact the terminal surface from which foreign material has been wiped off, and allowing impedance mismatching at a terminal transmission path to be eliminated; and to provide an electric connector including the socket terminal.

The invention discloses a multifunctional force cell sensor. The multifunctional force cell sensor comprises a cross elastic shaft, an output and input collecting ring, magnetic conductive connecting rods, a Fe-based nanometer microcrystalline alloy adhesion layer, excitation coils, measuring coils and an anti-magnetic interference shielding cover, wherein the four arms of the cross elastic shaft have the same length, the two ends in the vertical direction of the cross elastic shaft are provided with pulling force rings for pulling force measuring; the two ends in the horizontal direction of the cross elastic shaft are respectively provided with a shaft coupling for torque measuring and a pressure head for pressure measuring; the Fe-based nanometer microcrystalline alloy adhesion layer is attached to the bearing surface of the cross elastic shaft; the surface of the Fe-based nanometer microcrystalline alloy adhesion layer is wound by the measuring coils; the magnetic conductive connecting rods are connected with the end portions of the cross elastic shaft and thus a rhombus magnetic conductive steel frame is formed; the magnetic conductive connecting rods are wound by the excitation coils; and the whole sensor is arranged inside the anti-magnetic interference shielding cover. The multifunctional force cell sensor can measure not only pulling force and but also pressure and torque, and also has higher precision and sensitivity.

The invention discloses an active leaked current on-line measurement method for a power distribution network, and the method is used for the measurement of the active leaked current of a grounding distribution network where a neutral point is in series connection with a damping resistor through an arc extinguishing coil. The method comprises the steps: injecting a non-power-frequency specific frequency current signal to the distribution network through the zero-sequence voltage transformer of the distribution network; measuring a returned voltage signal in the arc extinguishing coil through avoltage transformer; calculating the ground leakage conductance of the distribution network and the active leaked current of the distribution network. The method achieves the online measurement of theactive leaked current, does not need to change the primary side wiring of the distribution network during measurement, avoids the impact on the normal operation of the distribution network, can eliminate the impact from the internal impedance and damping resistance of the voltage transformer, and is simple, convenient, economical and precise in measurement.

The invention discloses a converter control device. Due to the uncertainty of power grid conditions, the problems of access current harmonic amplification, power fluctuation, converter instability andthe like of a converter caused by impedance mismatching (a weak power grid) can be caused to endanger the safety of the converter and to shorten the life of the converter when the grid-connected converter is accessed under different power grid conditions, so that matching of output impedance of the converter under different power grid conditions and power grid impedance needs to be ensured to reduce the mutual influence of the converter and the power grid. By adopting a strategy of connecting a group of active power conversion devices to a grid-connected filter capacitor branch of the converter in series, the power grid impedance and the grid side harmonic component are eliminated and complete decoupling of the power grid is achieved through combining a common terminal (PCC terminal) grid-voltage unit feedforward control unit with the active devices.

The present invention is directed to a circuit assembly that includes an integrated circulator assembly. The circuit assembly has a first substrate, which contains a continuous circuit trace that includes a circulator component from the circulator assembly and at least one electrical component from the circuit assembly. A second substrate is disposed beneath the first substrate and includes a cladding on one surface. The second substrate contains an aperture that accepts a ferrite element, which is axially aligned with the circulator component of the circuit trace. A conductive material is placed across the ferrite element so that it forms a continuous ground plane with the cladding, which is common to the entire circuit trace. The circulator assembly also contains a magnet bonded to the ferrite element. The circulator assembly may also include a yoke disposed below the magnet to shield the circulator from external magnetic fields.

The present invention relates to a contactless card in smart card field and a control method thereof. The contactless card comprises a card chip, an antenna resonant circuit, and a confirmation unit. The confirmation unit, being separated from the antenna resonant circuit and connected to the I / O interface of the card chip, is used for confirming a card operation command by a cardholder so as to send a confirmation message to the card chip. The control method can be realized according to the following steps: putting a contactless card into a valid range for its reader; determining by the contactless card whether a command transmitted from the reader needs to be confirmed by the cardholder, if not, responding to the command by the contactless card, otherwise waiting for confirmation message by the contactless card; and receiving the confirmation message from the cardholder and responding to the command by the contactless card. The present method provides the cardholder with the light on the control of command execution and prevents the information stored in the card from being stolen or mis-operation to the card, which improves the usability of the contactless card and eliminates the impedance and enhances the continuity of the antenna resonant circuit and brings the convenience to the cardholder.

A miniaturized semiconductor device has a package substrate, a semiconductor chip mounted on the main surface of the package substrate and having plural LNAs each for amplifying a signal, an RF VCO for converting the frequency of the signal supplied from each LNA, and an IF VCO for converting the frequency of a signal supplied from a baseband. A plurality of ball electrodes are provided on the back surface of the package substrate. The package substrate is provided with a first common GND wire for supplying a GND potential to each of the LNAs, with a second common GND wire for supplying the GND potential to the RF VCO, and with a third common GND wire for supplying the GND potential to the IF VCO. The first, second, and third common GND wires are separated from each other.

An adjustable impedance high speed data connector, and methods for assembling and operating thereof. The adjustable impedance high speed data connector of this invention includes a printed circuit board accommodated within, or printed or stamped onto, a tray, the printed circuit board including sets of terminals respectively extending on opposite ends of the printed circuit board. Mounted onto the printed circuit board and electrically connected thereto is at least one electric module having a fixed or adjustable capacitance or a fixed or adjustable inductance, which may be combined in any desired combination to achieve a desired impedance for the connector. By adjusting the variable capacitance or inductance of the electric module (or the variable combinations of capacitance and / or inductance of a plurality of electric modules), the impedance within the connector is adjustable for allowing the connector to operate at various ranges of bandwidths.

The wiring needed to control all the functions in a vehicle is reduced, especially where the input source for operating a given function is remote from the function. A control member is provided that receives the input signal and converts it to a coded message that is applied to the power line. A function controller includes a coded reader and a control circuit for reading the code applicable to its associated function and controlling the function as instructed from the input signal. The control member also monitors the power line to insure that the message has been properly sent, and the message is repeated until proper transmission is confirmed.

The present invention provides improved method and system for magnetic heat to unload. While unloading magnetic head and in case of some power fault, the present invention can limit the maximum and minimum rate of the actuator. One counter electromotive force control circuit is used to compare the standard actuator rate and current actuator rate and has one inducing resistor to eliminate impedance of the actuator. In case of rate exceeding safety range, the counter electromotive force control circuit will reduce the current through the actuator to avoid ever greater acceleration, and vice versa.

The present invention relates to a contactless card in smart card field and a control method thereof. The contactless card comprises a card chip, an antenna resonant circuit, and a confirmation unit. The confirmation unit, being separated from the antenna resonant circuit and connected to the I / O interface of the card chip, is used for confirming a card operation command by a cardholder so as to send a confirmation message to the card chip. The control method can be realized according to the following steps: putting a contactless card into a valid range for its reader; determining by the contactless card whether a command transmitted from the reader needs to be confirmed by the cardholder, if not, responding to the command by the contactless card, otherwise waiting for confirmation message by the contactless card; and receiving the confirmation message from the cardholder and responding to the command by the contactless card. The present method provides the cardholder with the light on the control of command execution and prevents the information stored in the card from being stolen or mis-operation to the card, which improves the usability of the contactless card and eliminates the impedance and enhances the continuity of the antenna resonant circuit and brings the convenience to the cardholder.