3268 results about "Differential signaling" patented technology

A differential signal transmission cable structure for transmitting differential signals having GHz frequency band in the present invention is provided with a differential signal transmission pair cable 30 connecting a driver circuit 23a and a receiver circuit 23b, for transmitting differential signals having GHz frequency band, and a power supply ground transmission pair cable 31 connecting ground and a first power supply 26a connected to the driver circuit and ground and a second power supply 26b connected to the receiver circuit. Further characteristic impedance of the differential signal transmission pair cable is matched to that of the driver circuit and the receiver circuit, thereby enabling TEM waves of differential signals having GHz frequency band transmission mode to be maintained when the differential signals are transmitted.

Over-terminating the differential mode impedance of a differential transmission line, such as an INFINIBAND™ cable, at the receiving end, improves the differential signal integrity for typical variations in termination network impedance component (e.g., resistor) and transmission line characteristics. Eye opening of the differential signal can be made larger with reduced attenuation but increased jitter compared to under-terminating the differential mode impedance. Because the differential signal quality (larger eye opening) is improved, data can be transmitted over a longer transmission line with the same transmitter and receiver.

An electrical connector is provided for operation in a point-to-point application. The connector includes an insulated housing having first and second card interfaces configured to mate with associated first and second circuit cards. An electrical wafer is held in the housing and configured to operate in a point-to-point architecture. The signal traces end at signal contact pads located proximate to first and second edges, respectively. The signal contact pads receive a unidirectional signal. Each of the signal traces include a break section at an intermediate point along a length thereof to form a disconnect in the signal traces. The connector further includes an active compensation component bridging the break section in the signal traces. The active compensation component compensates the differential signal incoming from the input contact pads for signal degradation and transmits a compensated signal outward to the output contact pads. The active compensation component transmits the signal only in a single direction within the point-to-point architecture.

A differential transmission line connector with little unwanted radiation noise is provided. A connector connects a differential transmission pattern for multiple transmission of a group of three differential signals and a differential transmission cable. The differential transmission pattern is provided with three signal lines, and the differential transmission cable also is provided with three signal lines. In a plane that is perpendicular to the longitudinal direction of the differential transmission pattern and the differential transmission cable, the signal lines are positioned at the apexes of an equilateral triangle. The connector is provided with three signal lines that connect, at identical lengths, the signal lines of the differential transmission pattern and the signal lines of the differential transmission cable, between a predetermined first plane of the planes that perpendicularly intersect the longitudinal direction of the differential transmission pattern and a predetermined second plane of the planes that perpendicularly intersect the longitudinal direction of the differential transmission cable.

An electrical interconnection system with high speed, differential electrical connectors. The connector is assembled from wafers containing columns of conductive elements, some of which form differential pairs. Each column may include ground conductors adjacent pairs of signal conductors. The ground conductors may be wider than the signal conductors, with ground conductors between adjacent pairs of signal conductors being wider than ground conductors positioned at an end of at least some of the columns. Each of the conductive elements may end in a mating contact portion positioned to engage a complementary contact element in a mating connector. The mating contact portions of the signal conductors in some of the pairs may be rotated relative to the columns. The printed circuit board to which the differential signal connector is mounted may be constructed with elongated antipads around pairs of signal conductors.

Methods, apparatuses, and systems directed to a wireless node location mechanism that uses a signal strength weighting metric to improve the accuracy of estimating the location of a wireless node based on signals detected among a plurality of radio transceivers. In certain implementations, the wireless node location mechanism further incorporates a differential signal strength metric to reduce the errors caused by variations in wireless node transmit power, errors in signal strength detection, and / or direction-dependent path loss. As opposed to using the absolute signal strength or power of an RF signal transmitted by a wireless node, implementations of the present invention compare the differences between signal strength values detected at various pairs of radio receivers to corresponding differences characterized in a model of the RF environment. One implementation of the invention searches for the locations in the model between each pair of radio receivers where their signal strength is different by an observed amount.

The present invention relates to a method and mobile terminal for transmitting data on uplink within a mobile communication system. Further the invention relates to a network entity for allocating uplink resources to such a mobile terminal. When a user equipment is transmitting uplink (UL) data according to allocated resources, it has to indicate the transport format of the current data transmission to Node B by means of UL control signaling. To propose a scheduling scheme which reduces the overhead of uplink control signaling, a method is proposed that achieves a significant reduction of the UL control signaling overhead by considering characteristics of an orthogonal radio access scheme used for evolved UTRA uplink scheme and using differential signaling of the transport format information. Although the invention is particularly suitable for uplink transmissions in an orthogonal single-carrier radio access scheme, it is not restricted to this particular embodiment.

A low-power, area and pin efficient signaling alternative to serial differential links used for chip-to-chip, backplane, optical and other signaling applications. The multi-bit differential signaling (MBDS) generally comprises a driver and link termination network design coupled with a coding system based on n choose M (nCm) coding. MBDS has comparable electrical characteristics to conventional low-voltage differential signaling (LVDS) and is fully compatible with existing LVDS receivers in point-to-point and multi-point bus topologies. However, MBDS uses up to 40% less power, with up to 33% fewer I / O pads than equivalent LVDS links.

A technique for emulating differential signaling is disclosed. In one exemplary embodiment, the technique is realized by encoding a plurality of input signals so as to generate a plurality of encoded signals having a spatial run length of N, wherein N is an integer having a value of at least two. Each of the plurality of encoded signals is then transmitted over a transmission medium so as to provide a respective plurality of transmitted encoded signals. Each of the plurality of transmitted encoded signals is then compared with at least N neighboring others of the plurality of transmitted encoded signals so as to recover a representation of each of the plurality of encoded signals. Each of the plurality of recovered encoded signals is then decoded so as to generate a plurality of decoded signals representing the plurality of input signals.

The invention provides a high speed connector wherein differential signal pairs are arranged so as to limit the level of cross talk between adjacent differential signal pairs. The connector comprises lead frame assembly having a pair of overmolded lead frame housings. Each lead frame housing has a respective signal contact extending therethrough. The lead frame housings may be operatively coupled such that the signal contacts form a broadside-coupled differential signal pair. The contacts may be separated by a gap having a gap width that enables insertion loss and cross talk between signal pairs to be limited.

A high-speed parallel interface for communicating data between integrated circuits is disclosed. The interface is implemented by a transmitter and receiver pair and a single-ended parallel interconnect bus coupling to the transmitter and receiver pair. As opposed to transmitting small swing signals over differential signal lines, the transmitter transmits data to the receiver at full swing over the single-ended parallel interconnect bus. The invention can be implemented with simple CMOS circuitry that does not consume large die area. Accordingly, many link interfaces can be implemented on a single chip to provide a large data bandwidth.

A USB connection-detection circuitry and the operation method of the same are disclosed. The circuitry includes a transmitting circuit and a detecting circuit. The transmitting circuit contains a pair of differential signal lines, a pair of pull-down resistors and a pair of pull-up resistors wherein one pull-down resistor and one pull-up resistor are connected to the same differential signal line with their own individual switches. A power-related signal supplied by a power-supply system is received by the transmitting circuitry and transmitted through a differential signal line. Then, the power-related signal is grounded via a pull-down resistor. The detecting circuit is utilized to detect the power-related signals, which flow through the differential lines. When a device is connected to this connection-detection circuitry with a USB cable, the differential signal lines of the USB cable are connected with the differential signal lines of this circuitry. This results in the variation of the power-related signals, which are connected to the ground through the pull-down resistors originally. Therefore, by comparing the difference of the power-related signals before and after the connection, the connection-detection circuitry is able to automatically identify the mode of the device, which connects to the circuitry.

A method and apparatus for evaluating and calibrating a signaling system is described. Evaluation is accomplished using the same circuits actually involved in normal operation of the signaling system. Capability for in-situ testing of a signaling system is provided, and information may be obtained from the actual perspective of a receive circuit in the system. A pattern of test information is generated in a transmit circuit of the system and is transmitted to a receive circuit. A similar pattern of information is generated in the receive circuit and used as a reference. The receive circuit compares the patterns. Any differences between the patterns are observable. Preferably, the patterns are repeating patterns that allow many iterations of testing to be performed. In one embodiment, a linear feedback shift register (LFSR) is implemented to produce patterns. Information obtained from testing may be used to assess the effects of various system parameters, including but not limited to output current, crosstalk cancellation coefficients, and self-equalization coefficients, and system parameters may be adjusted to optimize system performance. An embodiment of the invention may be practiced with various types of signaling systems, including those with single-ended signals and those with differential signals. An embodiment of the invention may be applied to systems communicating a single bit of information on a single conductor at a given time and to systems communicating multiple bits of information on a single conductor simultaneously.

A high speed connector with reduced crosstalk utilizes individual connector support frames that are assembled together to form a block of connector units. Each such unit supports a column of conductive terminals in two spaced-apart columns. The columns have differential signal terminal pairs separated from each other by larger intervening ground shields that serve as ground terminals. The ground shields are arranged in alternating fashion within the pair of columns and they are closely spaced together so as to face a differential signal terminal pair. In areas where the terminals are mounted to the connector units, window-like openings are formed in the large ground shield terminals to reduce the amount of broadside coupling between the differential signal terminal pair and the signal terminal pair are narrowed to increase their edge-to-edge distance to account for the change in dielectric constant of the connector unit material filing in the area between the signal terminal pair.

A differential electrical test probe tip for sensing a plurality of electric signals and generating a differential signal including an elongate common substrate having a two signal test points at one end and a differential amplifier at the second end. Two transmission lines are on the common substrate, each connecting a respective signal test point a signal input of the differential amplifier. The characteristic impedances of the two transmission lines are substantially equal. In one preferred embodiment, the common substrate is a flexible substrate. In one preferred embodiment an over-mold, which may have gaps therein, at least partially encloses the common substrate, the first transmission line, and the second transmission line.

An improved open pin field connector is provided for enhanced performance when carrying high speed signals by selective application of one or more techniques for controlling electrical performance parameters. Lossy material may be positioned adjacent to conductive elements of the connector so as to reduce resonance in pairs of conductive elements and / or to provide a desired characteristic impedance for pairs of differential signal conductors. The lossy material may be shaped and positioned to avoid capacitive coupling that might otherwise increase cross talk. In a right angle connector, the lossy material may have a step-wise increase in thickness to provide comparable loss along longer and shorter conductive elements. Conductive elements may be shaped to balance performance characteristics of pairs selected to carry differential signals regardless of orientation along a row or column. Alternatively, conductive elements may have narrowed regions, covered with lossy portions, for reducing resonance while supporting DC signal propagation.

An electrical interconnection system with high speed, differential electrical connectors. The connector is assembled from wafers containing columns of conductive elements, some of which form differential pairs. Each column may include ground conductors adjacent pairs of signal conductors. The ground conductors may be wider than the signal conductors, with ground conductors between adjacent pairs of signal conductors being wider than ground conductors positioned at an end of at least some of the columns. Each of the conductive elements may end in a mating contact portion positioned to engage a complementary contact element in a mating connector. The mating contact portions of the signal conductors in some of the pairs may be rotated relative to the columns. The printed circuit board to which the differential signal connector is mounted may be constructed with elongated antipads around pairs of signal conductors.

A device for seamlessly providing 10BASE-T compatible data communications over an ordinary single twisted-pair home phone line between multiple computers and / or peripherals is disclosed. Each component that is to communicate over a home phone line needs a 10BASE-T compatible network interface card (NIC) for interfacing with the device. A transmit / receive switch is used to switch the device between a transmit mode and a receive mode. When a signal is being transmitted from a component, a Manchester decoder converts the signals received from the NIC into a raw data stream. A differential converter converts the raw data signal received from the NIC to a differential signal. A modulator is used to modulate the signal to a RF signal using a PSK, QPSK, QAM, MCM or similar modulation schemes. A filter is used to limit the bandwidth of the modulated signal and a driver is used to amplify the signal to match the impedance of the phone line. When the device receives a signal over the phone line, the signal is filtered using a bandpass filter and then amplified. The signal is then demodulated using an appropriate demodulation scheme before being differentially encoded. A Manchester encoder encodes the received signal for compatible operation with a receiving NIC.

A hearing compensation system comprises an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof, a differential analog-to-digital converter sampling the electrical signals output from the input transducer at an input thereof and outputting differential signal samples at an output thereof, a digital signal processing circuit having an input connected to the output of the differential analog-to-digital converter and operating on the differential signal samples to form processed differential signal samples at an output thereof, and an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof, the processed differential signal samples coupled to the input of the output transducer.

A high speed connector with reduced crosstalk utilizes individual connector support frames that are assembled together to form a block of connector units in a vertical arrangement. Each such unit supports an array of conductive terminals that are arranged in two spaced-apart rows. The rows have differential signal terminal pairs separated from each other by larger intervening ground shields that serve as ground terminals. The ground shields are arranged in alternating fashion within each row of terminals and they are closely spaced together so as to define within the rows of each connector unit, a horizontal serpentine pattern of ground shields that cooperate to act as a single “pseudo” shield within each pair of terminal rows.

A flash memory card includes a differential datapath that enables communications between the flash memory card and a host device to be performed using differential signals. The differential datapath can translate between the differential signals and card-specific signals that control read / write operations to the memory array of the flash memory card. The card-specific signals can be standard MultimediaCard, Secure-Digital card, Memory Stick, or CompactFlash card signals, among others. A host device that provides differential data transfer capability can include a similar differential datapath. By using differential data transfer rather than conventional clocked data transfer, overall data bandwidth between a flash memory card and a host device can be significantly increased, while simultaneously decreasing power consumption and pin requirements.

A high-density orthogonal connector is disclosed and may include electrical contacts that are configured to receive contacts from an orthogonal header connector while minimizing signal skew and signal reflection. The electrical contacts in the connector may define contact pairs (e.g., differential signal pairs). Each contact pair may include a lead portion and a mating interface that extends from the lead portion. The lead portions of the contact pair may define a first plane. One contact of the contact pair defines a first mating interface defining a second plane and the other contact in the contact pair defines a second mating interface defining a third plane. The second plane and the third plane may be both substantially parallel to and offset from the first plane in opposite directions. The contact pair may be configured such that the overall length of each contact within the pair may be substantially the same.

The invention discloses a configurable multi-mode multi-band satellite navigation receiving method and a radio frequency front end module constructed by the method. The front end module can receive signals of satellite navigation and positioning systems such as a global positioning system (GPS), the Big Dipper, a Galileo positioning system and a global navigation satellite system (Glonass), and comprises a configurable low-noise amplifier (LNA) with a buffer and an active balun, a folding passive mixer with a configurable frequency synthesizer, a configurable multi-mode filter, an automatic gain control (AGC) amplifier, a direct-current bias circuit, and a multi-mode multi-band program controlled and coded on-off control word from a receiving system. The radio frequency front end module can meet the requirement of multi-band multi-mode work through the control word programmed by the receiving system, has a simple and reliable structure, does not need complicated time division multiplexing control system and off-chip module, has low cost and high flexibility, and improves the noise performance of the radio frequency front end of the whole receiver and multi-mode multi-band signal processing capacity; and a one-channel signal is input into the module, and the module outputs a two-channel differential signal. The receiver can be used for receiving and processing multi-mode satellite navigation signals asynchronously, and receiving and processing satellite navigation signals with the required mode in different time intervals according to the requirement.

A termination structure for mating a cable connector to a circuit board includes a plurality of associated sets of terminals, each terminal set including a pair of differential signal terminals and a ground reference terminal. Each associated set of terminals is arranged in triangular pattern through the connector in order to reduce the impedance through the connector, and the sets are fixed within modules or blocks that are engageable together to form a connector housing. The housing modules permit adjacent associated terminal sets to be easily inverted so that the ground reference terminals of alternating associated terminal sets are located along one row of the connector along with signal terminals of intervening terminal sets, while the ground reference terminals of intervening terminal sets are located along a second row of the connector, along with the signal terminals of alternating associated terminal sets.

A terminal contact arrangement for a connector promotes reduction in deviation of the impedance of the connector when mated to an opposing connector and energized. The connector has an insulative housing with a plurality of terminal-receiving passages disposed in it. Conductive terminals are supported in some, but not all of the passages. The terminal contain distinct terminal sets that include a pair of differential signal terminals and at least two associated ground reference terminals. The two associated ground reference terminals are interconnected together so that electrically, they act as a single ground terminal having a width equal to the sum of the widths of the two connected ground reference terminals. The ground reference terminals of the sets are disposed in a single row of terminals, while the differential signal terminals of the same terminal set are disposed in another row of terminals spaced apart from the row of ground reference terminals. The differential signal terminals are separated from each other within their terminal row by an empty passage so that the two differential signal terminals of each terminal set are spaced farther apart from each other than they are spaced apart from their associated ground reference terminals.