Abstract: Embodiments are directed to rectifiers using a single bias current or bias current path to bias multiple rectifying elements. A rectifier that has multiple rectifier stages coupled together serially includes a bias current path coupled to each of the rectifier stages. The bias current path is configured to simultaneously bias rectifying elements in each of the rectifier stages by using a bias current to bias a first rectifying element and reusing the bias current to bias other rectifying elements.

Abstract: A planar flexible ultra-wide band (UWB) RF antenna includes a flexible non-electrically-conductive substrate and at least one antenna patch having electrically conductive metal positioned on one side of the flexible non-electrically-conductive substrate and having geometry defining a wirelessly transmitted UWB signal. The antenna may electrically couple with an RF transmitter circuit formed on a second side of the flexible substrate and controlled by a microcontroller circuit, formed on the second side, to transmit a radio signal. The RF tag may include at least one decoupling circuit directly electrically connected to the RF antenna and having a decoupling frequency that is different from a transmitting frequency of the antenna. The decoupling circuit transfers power from the antenna when the antenna receives capacitive power from an external non-electrical contact charger operating at the decoupling frequency and having at least one plate of similar geometry to the at least one antenna patch.

Abstract: A DC offset calibration circuit for calibrating DC offset with multi-level method includes analog DC offset cancellation unit and digital DC offset cancellation unit, wherein analog DC offset cancellation unit includes first amplifier and integrator, first amplifier receives analog signal with DC offset, and transmits to integrator, and integrator transmits first feedback signal to first amplifier to output amplified signal with fixed DC offset, and digital DC offset cancellation unit includes comparator, digital circuit, digital-to-analog converter and second amplifier, where second amplifier receives amplified signal with fixed DC offset and transmits to comparator for determining DC offset value and transmitting to digital circuit, digital circuit generates logical result according to DC offset value and transmits to digital-to-analog converter, and therefore digital-to-analog converter accordingly generates second feedback signal to second amplifier, to calibrate DC offset value on second amplifier.

Abstract: Provided is a power receiving device in which supply of power from a power supply device can be stopped while a reduction in Q-value is suppressed. The power receiving device includes a first antenna which forms resonant coupling with an antenna of the power supply device; a second antenna which forms electromagnetic induction coupling with the first antenna; a rectifier circuit including a plurality of switches and performing a first operation or a second operation depending on whether the plurality of switches is ON or OFF, the first operation being an operation in which voltage applied from the second antenna is rectified to be outputted, and the second operation being an operation in which a pair of power supply points is short-circuited; a load to which the voltage is applied; and a control circuit which generates a signal for selecting ON or OFF of the plurality of switches.

Abstract: One embodiment of the present invention provides a system for performing DC offset cancellation for a wireless receiver that includes one or more amplification stages between a demodulator and a baseband digital signal processor (DSP). During operation, the system calibrates values of static DC offset associated with a plurality of gain settings for at least one amplification stage, stores the calibrated DC offset values in a lookup table, receives a current gain setting for the amplification stage, maps a DC offset value from the lookup table based on the current gain setting, and cancels static DC offset for the amplification stage using the mapped DC offset value.

Abstract: A fluid sensor comprises a sensor housing (12), a sensor package (14), an actuator (16) and a switch (18). The sensor package (14) is disposed within the sensor housing (12) and includes first and second screens and at least one sensing membrane. The sensing membrane is disposed between the first and second screens (36) and is adapted to expand when exposed to a predetermined quantity of a first predetermined fluid. The actuator (16) is disposed proximate the sensor package (14) within the sensor housing (12) and moveable between a first position and a second position through an intermediate position. The switch (18) is disposed proximate the actuator (16) and is operable between closed and open positions. When the actuator (16) is in the second position at least a portion of the actuator (16) depresses the switch (18) to control an-electrical, circuit connected therewith.

Abstract: Example embodiments are disclosed for limiting radio frequency noise created during wireless charging of rechargeable batteries in radio frequency communication devices. In an example embodiment, a power source circuit in a wireless charging device produces a source alternating current. The source alternating current is passed through a radio frequency blocking filter to limit radio frequency noise. The filtered source alternating current is then driven through a transmitting coil in the charging device, which inductively couples with a proximately located receiving coil in a radio frequency communication device. An induced alternating current is passed through a second radio frequency blocking filter in the communication device, which limits radio frequency noise that could otherwise be created by the rectifier and control circuits in the communication device.

Abstract: In one embodiment, a method is provided for providing power to a radio-frequency (RF) component capable of operating under multiple communication standards, wherein each standard has a respective operating frequency. The method includes: receiving a communication standard signal indicative of which of the multiple communication standards the RF component is currently operating under; selecting a frequency for a power converter system in response to the communication standard signal, wherein the selected frequency is higher than a baseband frequency of the current communication standard for the RF component; generating an oscillation signal having the selected frequency; and operating the power converter system with the oscillation signal having the selected frequency to provide power to the RF component, wherein the operation of the power converter system causes minimal interference with the RF component operating under the current communication standard.

Abstract: A network for power transmission to a receiver that converts the power into current includes a first node for transmitting power wirelessly in a first area. The first area has a minimum electric or magnetic field strength. The network includes a second node for transmitting power wirelessly in a second area. The second area has a minimum electric or magnetic field strength and overlaps the first area to define an overlap area. In another embodiment, the network includes a source in communication with the first and second nodes which provides power to them. Also disclosed are methods for power transmission to a receiver that converts the power into current.

Abstract: A nanoscale electron shuttle with two elastically mounted conductors positioned within a gap between conductors produces asymmetrical electron conduction between the conductors when the conductors receive an AC signal to provide for rectification, detection and/or power harvesting.

Abstract: An amplifying circuit includes a pair of MOS transistors; an amplifier that amplify a difference between potentials of differential output nodes coupled to drains of the pair of MOS transistors; cancel circuits that cause cancel current to flow to one of the differential output nodes when the amplifier amplifies a voltage between the differential output nodes and that shut off, after the amplifier performs the amplification operation, inflow of the cancel current; and a controller that performs setting so that a potential of first one of the differential input signals is equal to a potential of another one of the differential input signals, that compares, before the inflow of the cancel current, potentials generated at differential output nodes when the difference between potentials of the differential output nodes is amplified, and that sets the cancel current so that the potentials are reversed after the inflow of the cancel current.

Abstract: A noise-reduction system includes a noise-pattern predictor in communication with a noise-canceling module. In a more specific embodiment, the noise-reduction apparatus further includes an input collector in communication with the noise-pattern predictor. The input collector is coupled to a first module, such as a sensor, that provides information to the noise-pattern predictor to facilitate predicting noise in an accompanying signal environment and to provide a first signal in response thereto. In an illustrative embodiment, the first signal includes information indicating when an ignition system of a vehicle will turn on. The first signal further includes information indicating when a second signal transmitted from a cellular base station will affect noise in the signal environment. The second signal may include a burst in a cellular signal.

Abstract: In one aspect, the invention is a far-field power extraction circuit which includes an integrated antenna and impedance matching portion and a rectifier portion. The antenna and impedance matching portion includes an antenna configured to be responsive to a propagating electromagnetic signal and which provides a resonant response at a resonant frequency. In response to the electromagnetic signal, the antenna provides an electromagnetic output signal at an antenna port. The antenna and impedance matching portion is configured to match an antenna impedance with a remainder of the far-field power extraction circuit including the rectifier portion of the power extraction circuit coupled to the antenna and impedance matching portion. The rectifier is configured to rectify the electromagnetic output signal provided by the antenna to produce a direct current (DC) voltage at an output of the rectifier.

Abstract: A method providing communication services to a mobile device is presented. In the method, a number of radio access networks are coupled with a packet data network by way of a number of access nodes. Each of a number of packet data flows between the mobile device and the packet data network are facilitated by way of the one of the radio access networks and one of the access nodes. State information regarding the packet data flows is exchanged between those of the access nodes facilitating at least one of the packet data flows so that each of those nodes possesses the state information for each of the packet data flows. One of the access nodes is then selected for facilitating one of the packet data flows based on the state information.

Abstract: A mobile terminal including a terminal housing having a first ground, a printed circuit board disposed in the terminal housing and having a second ground, and a leakage current preventing member installed between the first and second grounds and configured to block a direct current (DC) and passing an alternating current (AC) so as to prevent a leakage current from flowing to the terminal housing during a recharging of the mobile terminal.

Abstract: A voicemail header is modified to provide caller ID information in connection with the delivery of voice mail. The header may include an audible alert signal as is used in call waiting to alert a caller ID box in the customer's premises that caller ID information follows. The caller ID information is then delivered as FSK signaling information for display on the caller ID display.

Abstract: In one embodiment, a method is provided for providing power to a radio-frequency (RF) component capable of operating under multiple communication standards, wherein each standard has a respective operating frequency.

Abstract: An apparatus and a method of manufacturing an apparatus that creates power for a mobile communication device is disclosed. The apparatus may include a roller integrated into the mobile communication device configured to rotate in a counterclockwise direction when the roller contacts a surface and is moved in a first direction, and rotate in a clockwise direction when the roller contacts a surface and is moved in second direction, gearing connected to the roller, wherein the gearing rotates when the roller is moved, and one or more generator that creates power in the mobile communication device upon rotation of the roller and the gearing.

Abstract: A first bias circuit outputs a first direct-current voltage to charge a first capacitor based on a clock signal. A second bias that outputs a second direct-current voltage to charge a second capacitor based on a clock signal. A first MOS transistor has a gate and a source. The first direct-current voltage is applied between the gate and the source of the first MOS transistor to bias the gate of the first MOS transistor. A second MOS transistor has a gate and a source, and a drain connected to the source of the first MOS transistor. The second direct-current voltage is applied between the gate and the source of the second MOS transistor to bias the gate of the second MOS transistor. A coupling capacitor has a first end connected to the source of the first MOS transistor, and a second end to which an alternating-current signal is input.

Abstract: In one embodiment, a method is provided for providing power to a radio-frequency (RF) component capable of operating under multiple communication standards, wherein each standard has a respective operating frequency.

Abstract: Techniques and circuitry are provided for programmatically controlling signal offsets in integrated circuitry. In one embodiment, a buffer circuit having an offset cancellation circuit receives a signal and transmits the signal to programmable logic circuit. The programmable logic uses programmable resources and/or one or more algorithms to measure integrated circuit operations and/or operational errors associated with the offset. The control signal is fed back to an input of the offset cancellation circuit. In one embodiment, the offset cancellation circuit adjusts the offset of the signal in response to the magnitude of the offset cancellation signal received until changes associated with the offset and/or the magnitude of the operational errors are no longer attributable to the offset.

Abstract: An apparatus includes a filter module, an amplification module, and an adjustment signal source. The filter module generates a filtered signal based on a received signal. This filtered signal has a level shift corresponding to a difference between a direct current (DC) level of the filtered signal and a DC level of the received signal. From the filtered signal and an adjustment signal, the amplification module generates an amplified signal. The adjustment signal, which is provided by the adjustment signal source, may control (e.g., diminish) an effect of the level shift on a DC level of the amplified signal.

Abstract: An active step attenuator can attenuate the RF signal from a cable modem or other RF source. The active step attenuator converts the RF energy into a DC control signal that controls the attenuation applied to the RF signal. The voltage of the control signal is proportional to the RF energy, so that the active step attenuator attenuates a stronger RF signal more than a weaker RF signal. The active step attenuator may be in the form of a diplex circuit, one branch of which passes signals in one frequency band without attenuation and the other branch of which actively attenuates signals in another frequency band.

Abstract: Method and apparatus for sensing the envelope of high level multi frequency band RF signals in power amplifiers. For each frequency band, an RF transistor, such as a FET or a bipolar transistor is operated essentially at a non-linear operating point (e.g., in Class B, AB or C) at the frequency band. The RF transistor is fed by a DC power supply trough an RF filter and terminated by a dummy load that is tuned to the frequency band so as to terminate the RF components in the output signal of the RF transistor. An RF signal of the frequency band is fed into the input of the RF transistors and an output signal representing the envelope is obtained from the fluctuating current drawn from the DC power supply by the RF transistor, during the time period when the RF signal is applied to the input.

Abstract: Apparatus, systems, and methods are provided for suppressing radio interference from a noise source. One apparatus includes a controller for commanding a noise source to dither its operating frequency, and a filter for receiving signals from the controller indicating the present operating frequency of the noise source and to filter radio signals having the same frequency as the present operating frequency while the operating frequency is dithered. A system includes an electric motor having an operating frequency, a controller for commanding the motor to dither its operating frequency, and a filter configured to receive signals indicating the present operating frequency of the motor and to filter radio signals having the same frequency as the present operating frequency while the operating frequency is dithered. One method includes dithering the operating frequency of a noise source and filtering signals having the same frequency as the operating frequency while it is dithered.

Abstract: A DC-offset cancellation system for a wireless receiver is disclosed. The DC-offset cancellation system comprises an amplifier and an impedance inverter configured to transform inductance applied to a received signal to a capacitance.

Abstract: A comb-line wireless filter (5) includes an input end (505a), an output end (505b), a first transmission line (501b), a second and third transmission line (501a, 501c) each having a curved shape, and a first, second, and third capacitor (503b, 503a, 503c). The first transmission line has a first transmission line part and a second transmission line part. The second transmission line and the third transmission line are separately on the two sides of the first transmission line part of the first transmission line. The input end and the output end are separately connected to first ends of the second transmission line and the third transmission line. The capacitors are separately connected to first ends of the transmission lines. According to the curved shape of the second transmission line and the third transmission line, the size of the comb-line wireless filter is significantly reduced.

Abstract: In an access control system, a method and system for power management. A method of power management in a wireless access control system includes monitoring usage of a transceiver in a remote access point in a wireless access control system, de-activating the transceiver when the transceiver is not in use, and re-activating the transceiver upon occurrence of a predefined event. Additionally, the method may include transmitting a warning signal when an energy level of a power supply associated with the transceiver is below a predetermined threshold. The method may further include locking the remote access point when an energy level of a power supply associated with the transceiver is below a predetermined threshold. The remote access point may be locked until the energy level is above the predetermined threshold.

Abstract: Techniques and circuitry are provided for programmatically controlling signal offsets in integrated circuitry. In one embodiment, a buffer circuit having an offset cancellation circuit receives a signal and transmits the signal to programmable logic circuit. The programmable logic uses programmable resources and/or one or more algorithms to measure integrated circuit operations and/or operational errors associated with the offset. The control signal is fed back to an input of the offset cancellation circuit. In one embodiment, the offset cancellation circuit adjusts the offset of the signal in response to the magnitude of the offset cancellation signal received until changes associated with the offset and/or the magnitude of the operational errors are no longer attributable to the offset.

Abstract: A telecommunication system incorporates a vanadium redox battery energy storage system. The vanadium redox battery energy storage system receives and is charged by DC power. Upon power interruption, telecommunication equipment relies on the vanadium redox battery energy storage system to receive DC power. A charger/rectifier monitors received AC power to determine if an AC power interruption is occurring and initiates DC power transmission from the vanadium redox battery energy storage system to the telecommunication equipment.

Abstract: A constant current source for generating a constant reference current that is relatively temperature insensitive. The constant current source comprises: i) first circuitry for generating a first output current that increases with increases in temperature; ii) second circuitry for generating a second output current that decreases with increases in temperature; and iii) a current combiner circuit that combines the first and second output currents to thereby generate the constant reference current. A change in the first output current caused by a temperature change is at least partially offset by a change in the second output current caused by the temperature change.

Abstract: A circuit arrangement for detecting a received signal includes a rectifier with an input connected to a receiving antenna for rectifying an encoded received signal, a signal capacitor connected to an output of the rectifier, a discharge current sink connected to the signal capacitor, and a signal evaluating circuit connected to the signal capacitor. The discharge current sink includes a current mirror circuit of cascode-connected transistors. Thereby, the discharge current is substantially independent of the signal voltage over a larger range of voltages. This signal detection circuit is useful in transponders or remote sensors that receive and detect a signal transmitted by a base station.

Abstract: An electronic apparatus comprising a radio transmitter is disclosed. In a computer system (1) having a radio transmission circuit (3) of a phase modulation type supplied with power from a power supply (4) of a switching type, the switching frequency of the power supply (4) is determined based on the comparison frequency for the sampling operation of a PLL circuit (10) of the radio transmitter, thereby removing the power noises generated from the switching regulator of the radio transmitter of a phase modulation type.

Abstract: Provided is a signal processor including a band-pass filter and a low noise amplifier, which are covered with a vacuum insulation layer and cooled by a refrigerator. Further, a getter material where a heater for activation is built therein is installed in the vacuum insulation layer as a mechanism to control increase of gas pressure inside the vacuum insulation layer. The getter material is heated and activated by the heater when activating the refrigerator, and thus the gas pressure inside the vacuum insulation layer is reduced by operation of the getter material and status of vacuum insulation can be improved when the refrigerator is activated after the refrigerator has been stopped due to a power outage or the like.

Abstract: RF switches and methods of use are provided. In one embodiment, a RF switch includes first and second switch assemblies, each comprising an elongate member and a magnetic housing on an end of the member. The magnet is disposed between contact pads for first and second circuits, and an electromagnetic source is coupled to the assemblies. Each switch has a first and second state. Another RF switch of the present invention includes a rotor, an elongate member disposed centrally through the rotor, an actuator coupled to the member and configured to rotate the member and the rotor, and a contact on the rotor that may touch a substrate. The contact is used to complete a first path or a second path.

Abstract: A multipath noise reducer detects and removes the individual noise spikes occurring in an interval of multipath noise, thereby reducing the multipath noise with minimal distortion of the audio output signal. The multipath noise spikes are detected by comparing a rectified signal with a threshold signal derived from the rectified signal. When the multipath noise reducer is used in an FM stereo radio receiver, stereo separation may also be controlled according to the detection of multipath noise.

Abstract: This invention is applied to dual mode provided receiver capable of coinciding with both TDMA system and the non-TDMA system so as to provide a DC offset cancel circuit preferable for each communication method having a compact structure. In case where a predetermined time slot is allocated as an offset quantity detection time in the TDMA system, a first feedback loop is activated and corresponding to detection signals corresponding to differential output signals OUT, XOUT by a comparator 2, a detection result is updated in the holding section 3 according to a strobe signal STB and held therein. Output signals from the holding section 3 are fed back to an amplifier 1 through a selection section 5 and a DC offset is cancelled out.

Abstract: A wireless control system for use in system having a plurality of periodic noise sources includes an antenna; an RF receiver connected to the antenna for receiving RF noise from an external periodic noise source; a phase synchronization circuit connected to the RF receiver for generating a clock signal that is in phase with the external periodic noise; and a noise source control circuit connected to the phase synchronization circuit for receiving the clock signal and controlling a periodic noise source, whereby the periodic noise sources in the system are synchronized to emit their periodic noise in phase with each other.

Abstract: A power supply circuit includes a line voltage forming circuit and a supply voltage forming circuit. The line voltage forming circuit forms a voltage that is proportional to a line voltage provided by a telecommunication line, and the supply voltage forming circuit forms a second voltage from the first voltage. A sensing circuit senses the telecommunication line and provides a sensor signal that is representative of the power provided by the telecommunication line. The line voltage forming circuit is controlled by the sensor signal such that the slope of a load line characteristic of the line voltage forming circuit is modified when the sensor signal is above a predetermined threshold signal. The load line characteristic defines an increase of the line voltage with an increase of the line current provided by the telecommunication line.

Abstract: A radio communication device (100) having a receiver (110) for receiving a radio frequency (RF) signal includes first and second batteries (140, 175) for generating first and second voltages, respectively, wherein the second voltage is greater than the first voltage. A voltage multiplier (150) coupled to the first battery (140) boosts the first voltage to a third voltage that is greater than the first voltage during a first time period when the receiver (110) is disabled from receiving the RF signal. Other processing circuitry (115, 120) within the radio communication device (100) receives the third voltage and is powered thereby during the first time period when the receiver (110) is disabled from receiving the RF signal. The other processing circuitry (115, 120) receives the second voltage and is powered thereby during a second time period when the receiver (110) is enabled for reception of the RF signal.

Abstract: A D.C. supply circuit for a television receiver which has a load circuit including at least one controllable semiconductor switch, the supply circuit comprising means for rectifying an alternating mains supply, a smoothing circuit connected between the rectifying means and load circuit and delay means for delaying the application of the full rectified and smoothed voltage to the load circuit when the receiver is initially turned on, wherein the delay means include means for inhibiting a certain number of cycles of the rectified A.C. voltage from being applied to the said smoothing means, so as to provide a D.C. voltage in which the number of cycles inhibited from reaching the smoothing means determines the delay with which the said D.C. voltage reaches the full value at the load circuit.