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| Number | Title | Issue Date |
| 8174253 | Systems and methods that detect changes in incident optical radiation Systems, methods and sensors detect changes in incident optical radiation. Voltage is applied across one or more active areas of a detector while the incident optical radiation illuminates the active areas. Current is sensed across one or more of the active areas, a... | 05/08/2012 |
| 8049487 | Power measurement circuit A power measurement circuit and method are described. The circuit comprises: a transconductance rectifier arrangement including an input and configured to receive a periodically varying input voltage signal having an approximate 50% duty cycle; and an averaging filt... | 11/01/2011 |
| 8004269 | Wide bandwidth measurement of RF power into an arbitrary impedance load The present invention relates to a radio frequency (RF) power measurement circuit that measures delivered power to a load. The RF power measurement circuit includes a measurement RF transmission line coupled to the load, and measurement and power calculation circuit... | 08/23/2011 |
| 7821250 | RF sensor clamp assembly A clamp assembly for bringing an RF sensor into electrical contact with an RF current carrier is provided herein. The clamp assembly (101) comprises a first wedge-shaped element (103), and a second wedge-shaped element (105) which is slidingly e... | 10/26/2010 |
| 7812594 | Optical device and method of controlling the same An optical device includes an optical element, a detector and a controller. The optical element has an optical waveguide. Refractive index of the optical waveguide is controlled by a heater. A temperature of the optical element is controlled by a temperature control... | 10/12/2010 |
| 7746053 | Tester for RF devices For testing an RF device, such as an RF receiver/decoder chip that receives an RF signal via an antenna terminal and outputs a digital code at an output terminal, an inexpensive non-RF programmable tester is used. The programmable tester is a commercially available ... | 06/29/2010 |
| 7705582 | Broadband micro-machined thermal power sensor A power sensor includes a substrate, an aperture within the substrate, a membrane formed over at least a portion of the substrate and extending over the aperture, and an electro-thermal transducer partially supported by the insulating membrane. The electro-thermal t... | 04/27/2010 |
| 7652464 | RF power sensor with chopping amplifier An RF power detector having a wide dynamic range may comprise a chopping amplifier and is configured to detect pulsed high frequency RF signals. The chopping amplifier controlled by a bias current regulator amplifies and chops an RF signal by periodically enabling a... | 01/26/2010 |
| 7414424 | Directional power detection by quadrature sampling Power measurement and control in transmission systems are affected by changes in load conditions. A method and system are provided for detecting and controlling power levels independent of such load conditions. ... | 08/19/2008 |
| 7372249 | Load measurement for a thermal microwave power sensor A thermocouple power sensor includes the ability to monitor the value of a RF load resistor. A meter connects to the input of a thermocouple-based RF signal power detector. The apparatus can sense its own load resistor DC impedance, so it can detect both aging in an... | 05/13/2008 |
| 7358749 | Method, apparatus, and program for measuring an electromagnetic field and medium storing the program Provided is a method, apparatus and program for calculating an electric-field vector that allows for grasping the intensity, direction and phase of electric field on a scanning plane for an appliance, and a medium storing the program. An electric-field vector at an ... | 04/15/2008 |
| 7355417 | Techniques for obtaining electromagnetic data from a circuit board A system is configured to obtain electromagnetic data from a circuit board. A set of sensing locations resides in a plane which is substantially parallel to the circuit board. The system includes a probe, a robotic assembly coupled to the probe, and a controller cou... | 04/08/2008 |
| 7356309 | Directional coupler for communication system An improved directional coupler that significantly reduces the signal degradation problems associated with distortion caused by circuit elements used to measure the transmitted power. In a selected embodiment, the directional coupler of the present invention compris... | 04/08/2008 |
| 7343061 | Integrated photonic amplifier and detector An asymmetric twin waveguide (ATG) structure with an integrated amplifier and detector fabricated in a single active waveguide layer is disclosed. The structure comprises an active waveguide layer formed on a passive waveguide layer. The active and passive waveguide... | 03/11/2008 |
| 7339366 | Directional coupler for a accurate power detection A power detection system implemented using a pair of directional couplers and a transmission line (or equivalent) disposed between the directional couplers, wherein the transmission line (or equivalent) provides a 90° phase shift between the directional couplers. A... | 03/04/2008 |
| 7339963 | High speed data channel including a CMOS VCSEL driver and a high performance photodetector and CMOS photoreceiver A high speed optical channel including an optical driver and a photodetector in a CMOS photoreceiver. The optical channel driver includes a FET driver circuit driving a passive element (e.g., an integrated loop inductor) and a vertical cavity surface emitting laser ... | 03/04/2008 |
| 7333689 | Photonic integrated devices having reduced absorption loss An asymmetric twin waveguide (ATG) structure with quantum-well intermixing in the taper region of the active waveguide is disclosed. The structure comprises a first waveguide, a second waveguide, and a taper formed in the second waveguide. The taper has an intermixe... | 02/19/2008 |
| 7327910 | Twin waveguide based design for photonic integrated circuits An asymmetric twin waveguide (ATG) structure is disclosed that significantly reduces the negative effects of inter-modal interference in symmetric twin-waveguide structures and which can be effectively used to implement a variety of optical devices. The ATG structur... | 02/05/2008 |
| 7323884 | RF test chamber A system for testing radio frequency (RF) communications of a device capable of such communications is provided. The system includes a chamber for isolating the device from RF interference, an antenna that is suitable for RF communications with the device wherein th... | 01/29/2008 |
| 7317319 | Measuring method for electromagnetic field intensity and apparatus therefor, measuring method for electromagnetic field intensity distribution and apparatus therefor, measuring method for current and voltage distributions and apparatus therefor Intensities of electric and magnetic fields are measured by locating a conductor and reference conductor in the electromagnetic field so the conductor and reference conductor simultaneously output plural currents that are respectively simultaneously measured in diff... | 01/08/2008 |
| 7302124 | Twin waveguide based design for photonic integrated circuits An asymmetric twin waveguide (ATG) structure is disclosed that significantly reduces the negative effects of inter-modal interference in symmetric twin-waveguide structures and which can be effectively used to implement a variety of optical devices. The ATG structur... | 11/27/2007 |
| 7292054 | Impedance measuring apparatus of package substrate and method for the same An impedance measuring apparatus includes a plurality of RF (radio frequency) probes; a plurality of rotation mechanisms coupled to the plurality of RF probes, respectively; a processing unit, and a mechanical controller. The mechanical controller controls the plura... | 11/06/2007 |
| 7289775 | Method for transmit power control A transceiver has power control circuitry integrated therein. In particular, the power control circuitry receives a signal indicative of the transmit power level and adjusts the gain on a variable gain amplifier within the transceiver such that the output of the tra... | 10/30/2007 |
| 7280848 | Active array antenna and system for beamforming An active antenna array for use in a beamforming antenna system. The antenna array includes multicarrier power amplifiers coupled to each antenna element wherein the outputs of the multicarrier power amplifiers are linearized. The antenna array communicates with a b... | 10/09/2007 |
| 7276914 | System and method for guided TDR/TDT computerized tomography A system for detecting a defect or discontinuity in media or at an interface of the media includes a signal generator; a transmission path coupled to the signal generator, wherein the transmission path is arranged along or through the media; a detection circuit for ... | 10/02/2007 |
| 7274748 | AM to FM correction system for a polar modulator A transmitter for a mobile terminal including a polar modulator that compensates for amplitude to frequency distortion (AM to FM distortion) of a power amplifier in the transmit chain is provided. In general, the modulator includes a polar converter that converts an... | 09/25/2007 |
| 7274206 | Output power detection circuit A detection circuit for detecting the output power of a power amplifier comprises a first current minor transistor (Ti 1) having a base, which is connectable to a power transistor (T10), and a collector, a RF detection means (RF-det) for detecting the ... | 09/25/2007 |
| 7268564 | Apparatus for measuring specific absorption rate of radio communication apparatus In an apparatus for measuring a specific absorption rate (SAR), a first near magnetic field distribution of a radio wave radiated from an array antenna of a reference antenna including a plurality of minute antennas is measured, and an SAR distribution with respect ... | 09/11/2007 |
| 7256573 | Distributed active transformer power control techiques A distributed active transformer on a semiconducting substrate is provided. The distributed active transformer includes an outer primary, a secondary disposed adjacent to the outer primary, and an inner primary disposed adjacent to the outer primary and the secondar... | 08/14/2007 |
| 7256650 | VSWR tolerant power detector A system is provided for detecting the output power of power amplifier circuitry in a transmitter of a mobile terminal. Balanced power amplifier circuitry is provided having in-phase power amplifier circuitry and quadrature phase amplifier circuitry. A power detecti... | 08/14/2007 |
| 7242176 | Systems and methods for evaluating electromagnetic interference Systems and methods for evaluating electromagnetic interference that may be employed, for among other things, to evaluate electronic system immunity to radiated electromagnetic fields and/or to identify particular electronic system areas that are susceptible to elec... | 07/10/2007 |
| 7236137 | Earphone antenna, composite coil and coaxial cable used therefor, and wireless device provided with the earphone antenna An earphone antenna in which a balun is connected to one side and the other side having an audio/high-frequency dual-function signal connecting the earphone unit via a loading coil and wireless equipment connected to the balun, the loading coil selecting low impedan... | 06/26/2007 |
| 7230963 | Monolithic wavelength stabilized asymmetric laser A monolithic wavelength stabilized system comprises a laser monolithically formed with a waveguide splitter having at least two branches. Non-identical resonators having different wavelengths are operatively coupled to each branch of the splitter and a photodiode is... | 06/12/2007 |
| 7227502 | Patch antenna whose directivity is shifted to a particular direction, and a module integrated with the patch antenna A patch antenna with a directivity includes: a dielectric substrate to which at least one through hole is provided; a first ground electrode at least partially covering a back surface of the dielectric substrate; an antenna electrode partially covering an area of a ... | 06/05/2007 |
| 7221181 | Directional power detection by quadrature sampling Power measurement and control in transmission systems are affected by changes in load conditions. A method and system are provided for detecting and controlling power levels independent of such load conditions. ... | 05/22/2007 |
| 7221141 | Switched measuring system and method for measuring radiant signals A system for measuring radiant signals includes a detector circuit for detecting a time multiplexed, measured radiant signal and reference signal. A switch is connected to the detector circuit for receiving signals from the detector circuit. A measured signal sampli... | 05/22/2007 |
| 7212013 | Apparatus for measuring parasitic capacitance and inductance of I/O leads on an electrical component using a network analyzer Apparatus and methods are provided for measuring the potential for mutual coupling in an integrated circuit package of any type or configuration using a network analyzer in conjunction with a coaxial test probe. Simple, low-cost test fixturing and methods of testing... | 05/01/2007 |
| 7199593 | Apparatus and methods for measuring parasitic capacitance and inductance of I/O leads on an electrical component using a network analyzer Apparatus and methods are provided for measuring the potential for mutual coupling in an integrated circuit package of any type or configuration using a network analyzer in conjunction with a coaxial test probe. Simple, low-cost test fixturing and methods of testing... | 04/03/2007 |
| 7193579 | Balanced dipole antenna A balanced dipole antenna has a coaxial cable connected between a load or source and the left and right dipole arms to substantially eliminate common mode current and radiative coupling between the coaxial cable and the left and right dipole arms. The connection bet... | 03/20/2007 |
| 7190935 | Amplifier power detection circuitry The present invention provides an efficient way to detect the transmit power provided by an amplifier. A power sense signal indicative of the transmit power of the amplifier is generated and fed back to a control system, which will react accordingly to control input... | 03/13/2007 |
