Agilent Technologies, Inc.

Avago Technologies Ecbu IP (singapore) Pte. Ltd.

Keysight Technologies, Inc.

Avago Technologies Fiber IP (singapore) Pte. Ltd

Other

Hewlett-packard Company

Wistron Corporation

Avago Technologies General IP (singapore) Pte. Ltd.

Avago Technologies Ecbu IP Pte. Ltd.

Avago Technologies Enterprise IP (singapore) Pte. Ltd.

Avago Technologies Wireless IP (singapore) Pte. Ltd.

Avago Technologies Limited

Ken A Nishimura

Charles D Hoke

Rene P Helbing

Jonathan Noah Simon

Ian Hardcastle

Barry S Bronson

Pierre H Mertz

Gary B Gordon

Brian Elliot Lemoff

Travis N Blalock

Charels W Hoke

Richard Clayton Walker

Frank H Peters

Oliver D Landolt

William John McFarland

Richard C Ruby

Scott W Corzine

Jonah Alexander Harley

John Dwight Larson, Iii

Julie Elizabeth Fouquet

Barclay J Tullis

Michael Louis Frank

Dale W Schroeder

Stephen Roy Gilbert

John Stewart Wenstrand

William R Trutna, Jr

Kean Loo Keh

Jogesh Warrior

Gunter Steinbach

Kirk S Giboney

Mark A Unkrich

Thomas Allen Knotts

S Jeffrey Rosner

Chin Hin Oon

Kenneth D Poulton

George Panotopoulos

Danny E Mars

Graham Flower

Kenneth Rush

Steven Rosenau

Peter R Robrish

Brian Jeffrey Galloway

Douglas Sojourner

Qing Bai

James N Hollenhorst

Len-Li Kevin Lim

Charles Wu

Scott D Willingham

Tracy Verhoeven

Adrian Wan-Chew Seet

Cheongyuen Tsang

Jayendra Das

A system and method are provided for emulating an echo signal reflected from a diffuse target, having an indeterminate shape and range in a radar environment, in response to a frequency-modulated continuous-wave (FMCW) radar signal transmitted by a radar under test. The method includes receiving the FMCW radar signal from the radar under test, the FMCW radar signal having radar signal frequencies linearly modulated between a first frequency and a second frequency; generating a bandlimited noise-like signal having frequencies within predetermined frequency limits, and a spectral shape such that amplitudes of the noise-like signal vary in a predetermined manner with respect to the frequencies; mixing the noise-like signal with the received FMCW radar signal to provide an emulated echo signal reflected from the diffuse target; and transmitting the emulated echo signal of the diffuse target to the radar under test.

System and method for emulating diffuse targets

A method of emulating echo signals reflected from an elongated target during radar testing includes identifying first and second end points do the target; acquiring a radar signal from a radar sensor that includes multiple receive elements; generating emulated echo signals, responsive to the acquired radar signal, corresponding to target points on the target, including the first and second end points and reference points located on a line connecting the first and second end points, by repeatedly identifying descriptive attributes corresponding to each of the target points during an integration period of the radar sensor, where the descriptive attributes are identified by interpolating between the corresponding descriptive attributes of the first and second end points; and applying the emulated echo signals to the receive elements of the radar sensor, respectively, during the integration period, where radar sensor calculates a relative position of the target using the descriptive attributes.

Implementing non-point targets using direct synthesis of radar signals

An oscilloscope includes a time domain input, a logic domain input, and a frequency domain input. The time domain input provides a time domain input signal in a time domain as a first input signal. The logic domain input provides logic level input as a second input signal. The logic level input includes logic levels over time. The frequency domain input provides a third input signal through frequency downconversion.

Measurement instrument having time, frequency and logic domain channels

An analog delay line includes a clock generator, an analog sampling circuit, a bank of analog memory cells, a memory controller, an analog readout circuit, and an analog multiplexer. The clock generator is configured to output plural reception clock signals of different frequencies and plural transmission clock signals of different frequencies, the transmission clock signals offset in accumulated phase relative to the reception clock signals. The analog sampling circuit is controlled by at least one of the reception clock signals, and is configured to output a sequence of sampled voltages of an analog input signal. The memory controller is configured to control a write operation at a write frequency of at least one of the reception clock signals and a read operation at a read frequency of at least one of the transmission clock signals. The write operation is for sequentially storing the sampled voltages received from the analog sampling circuit in the bank of analog memory cells, and the read operation is for sequentially reading the sampled voltages from the bank of analog memory cells. The analog readout circuit is configured to buffer the sampled voltages read from the bank of analog memory cells. The analog multiplexer is controlled by at least one of the transmission clock signals, and is configured to multiplex the sampled voltages buffered by the readout circuit to generate an analog output signal. A sampling rate of the analog input signal is within a factor of 2 of a sampling rate of the analog output signal.

Analog delay lines and analog readout systems

In an exemplary embodiment, an RF device includes a receiver and an antenna. The antenna is configured to receive a reflected radio-frequency signal containing a set of modulated signal segments. Each modulated signal segment has a unique modulation pattern that indicates a time-variant reflectivity characteristic of a respective signal reflecting tile of a radio-frequency signal reflector. The receiver can include a circuit to process the modulated signal segments and determine a spatial intensity distribution of the radio-frequency signal incident upon the radio-frequency signal reflector. The spatial intensity distribution can be used by the circuit to determine a spatial radiation characteristic of an RF signal that is transmitted by a transmitter in order to produce the reflected radio-frequency signal. The transmitter, which can be incorporated into the RF device, includes a beam steering circuit that can modify a spatial radiation characteristic of the transmitted RF signal for addressing a misalignment.

Systems and methods for determining a spatial radiation characteristic of a transmitted radio-frequency signal

A method of calibrating a reconstructed signal from a plurality of sub-signals is provided. The method includes injecting a calibration signal having multiple tones into a received input signal; dividing the input signal into a first and second sub-signal, including an overlapping frequency band; performing a first frequency translation by converting frequency components of the second sub-signal; digitizing the first sub-signal and the frequency converted second sub-signal; performing a second frequency translation to reverse the first frequency translation to obtain a reconstructed second sub-signal; and quantifying impairments to the digital first sub-signal and reconstructed second sub-signal caused by differences in magnitude and phase of frequency components within the overlapping frequency band.

Calibrating reconstructed signal using multi-tone calibration signal

The area density of broadcast stations having respective service areas and broadcasting on the same channel is increased without exceeding a specified level of co-channel interference within the service areas by a method in which the field strength of the signal transmitted by the first broadcast station is monitored, and a field strength determining property of the first broadcast station is controlled in response to the monitoring.

System and method for increasing area density of terrestrial broadcast stations

An amplifier system and method that eliminates memory effects due to amplifier sharing. The amplifier has a plurality of input stages. An input to be amplified is applied to one of the input stages of the amplifier, while the other input stages are turned off and reset. The inputs of the unused input stages are thus reset and equalized while the other input stage is turned on to receive the input to be amplified. An explicit reset phase is not needed.

Techniques to reduce memory effect or inter-symbol interference (ISI) in circuits using op-amp sharing

A method and a system for displaying images are provided. In the method, a pixel is provided that includes a layer of ferroelectric material and a layer of liquid crystal material. A first electric field is momentarily applied to the pixel to electrically polarize the ferroelectric layer to a first polarization. The first polarization is then used to maintain the liquid crystal material in a first orientation corresponding to a first apparent brightness of the pixel.

Systems and method for displaying images with reduced power consumption

Display contrast in electro-optical display devices is improved using a drive circuit including pixel drive circuits and a common drive circuit. The pixel drive circuits are connected to pixel electrodes of the display device, and are operable to generate respective pixel drive signals that alternate between a first high voltage and a first low voltage differing in voltage by less than or equal to a process-limited maximum. The common drive circuit is connected to a common electrode of the display device, and is operable to generate a common drive signal alternating between a second high voltage and a second low voltage differing in voltage by more than the process-limited maximum. The common drive signal is asymmetrically bipolar with respect to the first low voltage of the pixel drive signal.

Method and apparatus to enhance contrast in electro-optical display devices

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

The pen input device has both a movement detection system and a position detection system that collectively track the position of the pen input device during a writing operation on a writing surface. The pen input device has a writing tip capable of performing a writing operation in contact with the writing surface. A controller is operable to activate the movement detection system continuously during the writing operation and to activate the position detection system intermittently during the writing operation. The movement detection system is operable to determine movement data that represent changes between successive positions of the writing tip. The position detection system is operable to determine position data that represents a position of the writing tip on the writing surface.

Pen input device and method for tracking pen position

The differential drive circuit generates a differential drive signal having a root mean square value defined by a digital input value. The differential drive signal includes a first differential component and a second differential component. The circuit comprises a first differential component generator and a second differential component generator. The first differential component generator is for counting the clock signal to generate successive values of a periodic count. Each of the values includes a most-significant bit. The first differential component generator is additionally for generating the first differential component in response to successive ones of the most-significant bit of the count. The second differential component generator is for generating the second differential component in response to the digital input value and the successive values of the count.

Differential drive circuit and method for generating an a.c. differential drive signal

In one embodiment, ones of a plurality of drive currents are modulated in accordance with ones of a plurality of unique modulation sequences. The modulated drive currents are then applied to a plurality of light emitters. Thereafter, a stream of optical measurements is obtained from a photosensor that is positioned to sense the aggregate light emitted by the light emitters. The stream of optical measurements is then correlated with the modulation sequences to extract optical responses to each of the plurality of drive currents. Finally, each drive current is regulated based on its relationship to its corresponding optical response. Related apparatus, and other methods for regulating the drive currents of a plurality of light emitters, is also disclosed.

Methods and apparatus for regulating the drive currents of a plurality of light emitters

Growing community of inventors

Fremont, CA, United States of America

Ken A Nishimura