Avago Technologies Wireless IP (singapore) Pte. Ltd.

Agilent Technologies, Inc.

Intel Corporation

Avago Technologies General IP (singapore) Pte. Ltd.

Avago Technologies Fiber IP (singapore) Pte. Ltd

Avago Wireless IP Pte Ltd

Graham Flower

Richard C Ruby

Mark A Unkrich

John Dwight Larson, Iii

William R Trutna, Jr

Storrs Townsend Hoen

Annette Claire Grot

Ken A Nishimura

William H Wang

Michael Louis Frank

Richard Clayton Walker

Brian H Kim

Darren S Crews

Michael Allen Robinson

William Richard Trutna

Lee Xu

Kirk S Giboney

Peter Pei-Tak Ho

Miaobin Gao

Jesse Chin

Steven Rosenau

John Stephen Kofol

Chien-Chang Liu

Yousheng Wu

Xiaojie J Xu

Guobin Liu

Thiri Lwin

Frank Wang

Simon Lee, Ii

Systems and methods of detecting wireless channel status from acoustic discrimination of spectral content are described. In one aspect, a wireless system includes a spectrum analyzer, a detector, and a controller. The spectrum analyzer is operable to acoustically discriminate spectral content of an input electrical signal in multiple discrete frequency channels. The detector is operable to determine respective statuses of the frequency channels from the acoustically discriminated spectral content. The controller is operable to select one of the frequency channels based on the determined statuses of the frequency channels.

Detecting wireless channel status from acoustic discrimination of spectral content

Embodiments introduce redundant optical channels to significantly extend the lifetime of parallel optical transceivers. A plurality of transmitters, N, transmit on a plurality of optical channels, where N is an integer number of optical channels greater than 1. One or more redundant channels, M, are also provided. N+M multiple input shift registers provide multiple paths for signals from each of the transmitters to connect to N+M laser diodes. In the event up to M of the N+M laser diodes fail, the multiple input shift registers connect the N transmitters to functioning ones of the N+M laser diodes thus extending the life of the device. A corresponding scheme is also described for the receiver side.

Redundant channel implementation to extend optical transceiver lifetime and reliability

A sensor senses an environmental condition. The sensor includes a film bulk acoustic resonator that includes a layer of material that causes resonant frequency and/or quality factor shifts of the film bulk acoustic resonator in response to changes in the environmental condition. The environmental condition may be relative humidity and the layer of material may be a moisture absorptive material.

Apparatus and method for measuring an environmental condition

The system comprises a first beatable signal source, a second beatable signal source, a phase reference signal source and a receiver. The first beatable signal source and the second beatable signal source are located at the source location; the receiver is located at the receiver location. The phase reference signal source is operable to generate a phase reference signal. The first beatable signal source is operable to transmit a first beatable signal. The second beatable signal source is spatially offset from the first beatable signal source in a reference direction, and is operable to transmit a second beatable signal differing in frequency from the first beatable signal by a frequency difference. The first beatable signal and the second beatable signal collectively have a phase relationship with the phase reference signal. The receiver is structured to receive the first beatable signal and the second beatable signal and is operable to determine a direction angle, relative to the reference direction, of the source location from the receiver location. The receiver performs operations that comprise measuring a phase difference between a beat signal and either the phase reference signal or an additional beat signal, and determining the direction angle from the measured phase difference. The beat signal obtained by a process involving summing the first beatable signal and the second beatable signal. The additional beat signal is obtained by a process involving summing the first beatable signal and the phase reference signal. The bearing can be determined from the direction angle.

System and method for determining the bearing of a source location from a receiver location

A spread-spectrum radio, such as a frequency-hopping spread-spectrum radio or a direct-sequence spread-spectrum radio, includes a transmitter that utilizes microelectromechanical systems (MEMS) based oscillation system to generate a spread-spectrum signal and/or a receiver that utilizes a MEMS-based frequency selection system to receive a spread-spectrum signal. In an embodiment, the MEMS-based oscillation system and the MEMS-based frequency selection system utilize MEMS resonators such as thin film bulk acoustic resonators (FBARs) that are fabricated in high density on a single substrate.

Spread-spectrum radio utilizing MEMS components

An apparatus and method for measuring a target environmental variable (TEV) that employs a film-bulk acoustic resonator with motion plate. The film-bulk acoustic resonator (FBAR) includes an acoustic reflector formed in an FBAR wafer and a surface. A first electrode is formed on the surface of the acoustic reflector and has a surface. A piezoelectric layer is formed on the surface of the first electrode and has a surface. A second electrode is formed on the surface of the piezoelectric layer. A motion plate is suspended in space at a predetermined distance relative to the surface of the second electrode and is capacitively coupled to the FBAR.

Film-bulk acoustic wave resonator with motion plate and method

An apparatus and method for detecting a target environmental variable (TEV). A first film-bulk acoustic resonator (FBAR) oscillator that includes a first FBAR with a first response to the target environmental variable generates a first frequency. A second film-bulk acoustic resonator (FBAR) oscillator that includes a second FBAR with a second response to the target environmental variable generates a second frequency. A circuit that is coupled to the first FBAR oscillator and the second FBAR oscillator determines the target environmental variable (e.g., changes in the TEV) based on the first frequency and the second frequency.

Apparatus and method for detecting a target environmental variable that employs film-bulk acoustic wave resonator oscillators

An integrated circuit (IC) device for driving a light emitting device, such as a laser diode, includes a heat-absorbing structure fabricated on a substrate over an electrical component, such as an output transistor, to reduce the heat transfer between the electrical component and the light emitting device. The heat-absorbing structure is designed to absorb some of the heat generated by the electrical component so that less heat from the electrical component is transferred to the light emitting device, which reduces the operating temperature of the light emitting device. A method of fabricating the IC device includes forming the electrical component on the substrate and forming the heat-absorbing structure on the substrate over the electrical component. The heat-absorbing structure may be configured to substantially encase the electrical component.

Integrated circuit device for driving a laser diode with reduced heat transfer and method for fabricating the device

An optical detector and method for detecting incident light utilizes a pair of photosensitive devices in which one of the photosensitive devices is selectively exposed to the incident light to generate differential current signals that can be used to measure the intensity of the incident light. The photosensitive devices may be phototransistors having a silicon-germanium (SiGe) absorption region that is able to convert longer wavelength light, such as 980 nm or 1300 nm light, into current. The SiGe phototransistors may be fabricated on a silicon substrate.

Optical detector and method for detecting incident light

A symmetrical photo-amplifier circuit with improved power supply rejection includes a signal circuit and a reference circuit, in which the electrical capacitances and parasitic capacitances from mechanical sources, such as bond wires and substrates, are matched between the signal circuit and the reference circuit.

Photo-amplifier circuit with improved power supply rejection

A multiplexer for use with switching apparatus for data communication networks. The multiplexer topology includes two or more groupings, or sections, each containing a plurality of individual channels. Each of the channels has an input buffer amplifier and an output Ft-doubler circuit. The outputs of all of the channels within a each particular channel section are connected in parallel relation, and fed to respective common-base transistor amplifiers. The outputs of all of the common-base amplifiers for each channel section, in turn, are connected in parallel and fed to the inputs of a pair of emitter-follower amplifiers. Through the use of selectively actuated current sources, each multiplexer channel is normally biased off, unless that channel is selected for a switching operation. Bleeder current sources are applied to the emitters of the common-base amplifiers to reduce output jitter from the channels which are biased off. The multiplexer architecture provides high speed operation from channel sectioning, and low power consumption by reducing both the amount of current drawn and the voltage potential necessary, to operate the multiplexer.

Multiplexer with channel sectioning, selectivity actuated current sources, and common-base amplifiers

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San Jose, CA, United States of America

Graham Flower