Litepoint Corporation

National Semiconductor Corporation

Rockwell Semiconductor Systems, Inc.

Benny Madsen

Christian Volf Olgaard

Thomas Toldborg Andersen

Spiros Nikolaos Bouas

Carsten Schau Andersen

Peter Petersen

Rick William Umstattd

Gary Wang

James E Petranovich

Gerard G Socci

Sheldon L Gilbert

Joseph T Lipowski

Daniel E Fague

Bjorn E Bjerede

John Christopher Lukez

Nabil Ayoub Elserougi

Niels Vinggaard

Jens Hansen

Xiangdong Zhang

Jens T Petersen

Mohan Bollapragada

Ruth Umstattd

Greg Ravenscroft

A system and method of providing driver software to a test controller to facilitate testing by a wireless transceiver tester of a device under test (DUT). Using the wireless transceiver tester, executable tester instructions are accessed from one or more computer readable media and in accordance therewith bi-directional signal communications are established between the wireless transceiver tester and the test controller, and between the wireless transceiver tester and the DUT. Further accessed are executable driver instructions, including a plurality of executable driver program instructions for driving at least one of the wireless transceiver tester and the DUT, which are communicated to the test controller.

System and method of providing driver software to test controller to facilitate testing by wireless transceiver tester of a device under test

A system, method and article of manufacture are provided for utilizing an interface client in an interface roaming network. In general, an interface client in the interface roaming network submits information about the interface client to a wireless link in vicinity to the interface client. The interface client may then subsequently receive content and then display the content on a display.

System, method and article of manufacture for utilizing an interface client in an interface roaming network framework

A method for testing a wireless transceiver embedded within a wireless data communication system that also includes a host processor with minimal interaction between the wireless transceiver and the host processor during such testing. The wireless signal interface between the wireless data communication system and external test equipment is used to convey test initiation or data signals from the external test equipment to the wireless data communication system, and responsive data or acknowledgement signals from the wireless data communication system to the external test equipment.

Method for testing embedded wireless transceiver with minimal interaction between wireless transceiver and host processor during testing

A test solution for one or more circuits implementing a communication standard is based on a design specification received from a development organization and a communication standard. The test solution is evaluated with one or more prototype circuits and is selectively modified based on the evaluation with the prototype circuits. The test solution is then evaluated with one or more manufactured circuits and is selectively modified based on the evaluation with the manufactured circuits.

Test solution development method

A distributed test equipment system for testing analog communications systems. One or more analog signal receivers and one or more computers are connected via a packet-switched network such that each computer can remotely control and receive signal data from each receiver. Analog signal data measured by each receiver is available for relaying to each computer where it is processed for analysis in conformance with respective user commands.

Distributed test equipment system for testing analog communications systems

A method and apparatus for generating a reference transmission signal for use in testing a communications system. A data packet transmission signal containing a plurality of reference data is captured and digitized, following which reference data is retrieved. The retrieved data is used to modulate a carrier signal to produce a digital transmission signal, which is stored for later use, such that impairments in a signal from a traditional trusted unit are substantially removed, thereby minimizing uncertainty during later testing using such signal.

Method and apparatus for generating reference transmission signal for use in testing communications receivers

A radio frequency (RF) transceiver for providing substantially coincident communication of RF and related baseband control signals. Baseband circuitry within the transmitter and receiver sections provides for storage of related control data which can be used in real time to control processing of the transmitted or received data, respectively.

Radio frequency (RF) transceiver with substantially coincident communication of RF and related control signals

A system, method and article of manufacture are provided for facilitating user interface roaming in an interface roaming network framework. Received from a wireless link is a list of usable interface clients in proximity to the wireless link. Each usable interface client has functional capabilities associated with it. One of the interface clients is selected from the list and the wireless link is notified of the selected interface client. A connection is then initiated with the selected interface client and an application is executed based on the capabilities of the selected interface client in order to generate content. The generated content is then transmitted to the interface client so that the content may be displayed using the interface client.

System, method and article of manufacture for facilitating user interface roaming in an interface roaming network framework

A system, method and article of manufacture are provided for utilizing a wireless link in an interface roaming network. A wireless link is utilized to scan a vicinity of the wireless link to detect one or more interface clients in the vicinity. The wireless link then transmits to an infrastructure server information relating to the interface clients detected in the vicinity. Based on the transmitted information, the infrastructure server then selects one of the interface clients. Subsequently, the wireless link receives a notification from the infrastructure server of the selected interface client and a connection between the infrastructure server and the selected interface client is initiated for communication therebetween.

System, method and article of manufacture for utilizing a wireless link in an interface roaming network framework

A frequency synthesizer with a digital frequency lock loop (FLL) having a fast frequency lock time uses a frequency counter circuit in the feedback loop to count the output signal frequency and produce frequency count data. A modulation control circuit provides modulation data and a corresponding modulation control signal for modulating the FLL signal source. A microprocessor processes the frequency count data along with the modulation data to provide a frequency control signal for controlling the nominal, or center, frequency of the FLL signal source. By processing these data together, thereby accounting for the amount of modulation applied to the FLL signal source, the center frequency can be maintained more consistently notwithstanding the presence of modulation within the feedback loop signal.

Frequency synthesizer with digital frequency lock loop

A modulation synthesizer circuit produces a fixed intermediate frequency unmodulated signal without harmonics aliasing back into the transmit spectrum, thus, eliminating the need for a bandpass filter. The modulation synthesizer circuit includes a phase shifter placed before the down conversion mixer. The phase shifter may be placed outside the modulation synthesizer loop such that the phase shifter produces quadrature carrier wave signals to the down conversion mixer. In the alternative the phase shifter may be kept within the modulation synthesizer loop and produce quadrature modulated transmit signals to the down conversion mixer. Any harmonic frequencies generated by the phase shifter are harmonics of the carrier wave signal or modulated transmit signal. Thus, with the appropriate choice of carrier wave signal or modulated transmit signal, any harmonics generated by the phase shifter can be prevented from aliasing back into the transmit spectrum and therefore need not be filtered. Consequently, the bandpass filter typically found after the quadrature modulator can be eliminated.

Elimination of bandpass filter after quadrature modulator in modulation

The preferred embodiment improves the modulation accuracy of a communication system having a surface acoustic wave (SAW) device filtering a modulated signal. An equalizer filter is used to predistort the signal to be filtered so as to equalize the SAW filter response. In the preferred approach, the equalizer also provides baseband filtering. In this particular embodiment, the original baseband filter impulse response is convolved with the inverse of the actual SAW filter impulse response. The resulting values provide the coefficients for a digital filter (i.e., a modified baseband filter) forming part of a DQPSK modem. When the signal filtered by the modified baseband filter is then up-converted and filtered by the SAW filter, the predistortion caused by the modified baseband filter equalizes the SAW filter distortion, and only the modulation errors of the original baseband filter occur. In other embodiments, the equalizer filter characteristics are derived solely from the SAW filter impulse response or frequency response to equalize any distortion resulting from the SAW filter. In the preferred embodiment, the coefficients for the digital filter are stored in a ROM lookup table.

Equalization filter compensating for distortion in a surface acoustic

An integrated circuit chip set is provided for use in a radio communication system in which a modulated digital input signal is processed for transmission and a modulated signal received from an antenna is processed to provide an output signal, wherein the modulation of the signals is either QPSK or FSK and the signal transmission and reception is by either TDD or FDD. The chip set includes an IF integrated circuit chip for processing a digital input signal to convert the digital input signal into an analog input signal and to provide the input signal at an intermediate frequency and for processing a received signal at the intermediate frequency to down convert the frequency thereof and to provide an output signal from the down-converted received signal; and an RF integrated circuit chip for processing the input signal provided by the IF chip at the intermediate frequency to up convert the frequency thereof to a transmission frequency and for processing a received signal provided at the reception frequency to down convert the frequency thereof to the intermediate frequency. The IF chip includes switches and terminals for enabling the IF chip to be connected for processing by the IF chip of QPSK-modulated signals or to be connected for processing by the IF chip of FSK-modulated signals; and the RF chip includes terminals for enabling the RF chip to be connected for processing by the RF chip of TDD transmitted and received signals or to be connected for processing by the RF chip of FDD transmitted and received signals.

Universal radio architecture for low-tier personal communication system

A phase-lock loop (PLL) includes a switch for opening the loop (e.g. for direct modulation of its voltage-controlled oscillator (VCO) during transmission of an intermittent signal such as data bursts) and has a phase comparator which can be selectively initialized (e.g. by setting to a programmed value or resetting to zero or terminal count value the reference and/or feedback signal frequency dividers) so that upon 're-closing' of the loop the PLL will achieve phase-lock within a predetermined amount of time. When the loop is opened, the VCO's dc ('phase-lock') control voltage can be maintained so as to help ensure that phase-lock will be achieved within the desired amount of time.

Phase detection reset in phase locked loops used for direct VCO

A radio frequency (RF) transceiver for modulating and demodulating RF signals with a direct modulation transmitter and a dual intermediate frequency (IF) receiver, respectively, includes a local oscillator, three frequency converters, a demodulator, a carrier generator, a modulator, a controller and two signal switches. The local oscillator (e.g. phase lock loop PLL!) provides a first local oscillator (LO) signal. One frequency converter (e.g. mixer) frequency converts an incoming modulated RF signal with the first LO signal to provide a first modulated IF signal. A second frequency converter frequency converts the first modulated IF signal with a second LO signal to provide a second modulated IF signal. The demodulator also receives the second LO signal and demodulates therewith the second modulated IF signal. The carrier generator (e.g. voltage-controlled oscillator VCO!) receives a transmitter control signal and in accordance therewith generates a transmitter carrier signal. The third frequency converter receives the transmitter carrier signal and the first LO signal and in response thereto provides the second LO signal. The modulator selectively receives and modulates the second LO signal to provide a third modulated IF signal. The controller (e.g. phase detector) receives a reference signal and selectively receives the second LO signal and the third modulated IF signal and in response thereto provides the transmitter control signal. The signal switches receive a mode control signal and in response to one state thereof connect the controller to the third frequency converter and in response to another state thereof connect the modulator to both the third frequency converter and controller.

Growing community of inventors

Los Altos, CA, United States of America

Benny Madsen