Patent application number | Description | Published |
20130250815 | DISTRIBUTED SPANNING TREE PROTOCOL - A network element coupled to a communication network is described. The network element includes multiple switching units. The switching units may be configured to independently implement a Spanning Tree Protocol (xSTP) processing in a completely distributed manner including each of the switching units independently calculating an external spanning tree for the network element in the communication network. The network element may act as a single bridge to other network elements in a bridging domain of the communication network. | 09-26-2013 |
20130250961 | VIRTUAL SUBPORT DATA TRAFFIC MANAGEMENT - A network element includes an ingress interface, a VSP queue, and a switch fabric (SWF). The ingress interface includes a first virtual subport (VSP) and a second VSP. The first VSP is configured to receive data traffic. The VSP queue is coupled to the second VSP such that data traffic transmitted to the VSP queue is transmitted from the network element via the second VSP. The SWF is configured to receive data traffic from the first VSP, determine whether an intended recipient of the data traffic is associated with the second VSP, and hairpin the data traffic to the VSP queue when the SWF determines that the intended recipient is associated with the second VSP. | 09-26-2013 |
20140112204 | METHOD AND SYSTEM FOR SUPPORT OF SPANNING TREE PEERING AND TUNNELING IN A FLOOD DOMAIN - A network element includes a first customer edge port (CEP) coupled to a customer network, a first and a second flood domain. The first and second flood domain each include one or more provider network ports associated with a provider network. The first CEP is configured to peer spanning tree protocol (STP) data units across a network, and receive and transmit a data unit to a first STP processing instance associated with the first CEP. The first STP processing instance is configured to determine whether the data unit is associated with the first or second flood domain, and forward the data unit to the determined flood domain. The network element includes a second CEP coupled to the customer network and the first flood domain. The second CEP is configured to tunnel STP data units across the provider network, receive and forward a second data unit to the first flood domain. | 04-24-2014 |
Patent application number | Description | Published |
20110304373 | LOW VOLTAGE HIGH-SPEED WAVE SHAPING CIRCUITRY - Within hard disk drives (HDDs), for example, a preamplifier or preamp is generally used to perform read and write operations with a magnetic head. Typically, for write operations, the preamplifier generates a current waveform that uses a DC current to polarize magnetic elements within the disk and overshoot components to compensate for frequency dependent attenuation in the interconnect between the head and preamp. Conventional pulse-shaping circuitry used for this application uses high voltage to accomplish this task. Here, however, pulse-shaping circuitry is provided which can generate a similar waveform using lower voltage (i.e., about 5V) for this application and others. | 12-15-2011 |
20130100551 | METHOD AND APPARATUS FOR REFLECTION CANCELLATION - A method for calibrating a reflection compensator is provided. A delay is initially set to a predetermined minimum, and an input pulse is transmitted across a transmission line. A compensation current is then applied after the delay. The reflection from the transmission line is digitized to generate a measurement, and a determination is made as to whether the compensation current substantially compensates for the reflection. If the compensation current does not substantially compensate for the reflection, then the delay is adjusted, and the process is repeated until the compensation current substantially compensates for the reflection. | 04-25-2013 |
20130106485 | LEVEL SHIFTER | 05-02-2013 |
20130176639 | PROXIMITY SENSING SYSTEM - A data storage system for detecting a location of a head relative to a magnetic media is described. This system comprises arms, a preamplifier circuit coupled to the arms for controlling the arms, a proximity sensing system positioned within the preamplifier circuit, the proximity sensing system comprising: an input stage for transmitting an input sense signal; a programmable gain stage coupled to receive the input sense signal and operative for transmitting a gain signal in response to receiving the input sense signal; a multiplexer coupled to receive the gain signal and at least one control signal, the multiplexer operative for transmitting a multiplexed signal; a detector coupled to receive the multiplexed signal and a second control signal, the detector operative for transmitting an output signal; wherein an amplitude associated with the output signal enables detecting the location of the head. | 07-11-2013 |
20130257514 | SOURCE-FOLLOWER BASED VOLTAGE MODE TRANSMITTER - An apparatus is provided. A first switch is coupled between first and third nodes in an H-bridge. A second switch is coupled between first and fourth nodes in the H-bridge. A third switch is coupled between the second and third nodes. A fourth switch is coupled between second and fourth nodes in the H-bridge. A first source-follower is coupled to the first node of the H-bridge and the first supply rail, and the first source-follower is configured to receive a first reference signal. A second source-follower is coupled to the second node of the H-bridge and the second supply rail, and the second source-follower is configured to receive a second reference signal. | 10-03-2013 |
20130286499 | VOLTAGE-MODE DRIVER - A method is provided. A first CMOS switch is deactivated while activating a second CMOS switch to cause the portion of the write signal to transition from a first direct current (DC) voltage to a first peak voltage. After a first interval, the second CMOS switch is deactivated while activating a third CMOS switch to cause the portion of the write signal to transition from the first peak voltage to a second DC voltage. After a second interval, the third CMOS switch is deactivated while activating a fourth CMOS switch to cause the portion of the write signal to transition from the second DC voltage to a second peak voltage After a third interval, the fourth CMOS switch is deactivated while activating the first CMOS switch to cause the portion of the write signal to transition from the second peak voltage to the first DC voltage. | 10-31-2013 |
20140285925 | DRIVER CIRCUIT - A driver circuit includes a first current source configured to sink part of the current from a power supply through a load and a second current source configured to sink part of the current from the power supply to a return path, bypassing the load, so that the current through the load is the difference between the current from the power supply and the current through the second current source. | 09-25-2014 |
20140292354 | CAPACITIVE SENSOR - A capacitive sensor has at least first and second conductive areas so that a first capacitance is formed between the first conductive area and a surface, and a second capacitance is formed between the second conductive area and the surface, and the ratio of the first capacitance to the second capacitance has a predetermined value only when the sensor is at a predetermined distance from the surface. | 10-02-2014 |
20140300984 | CIRCUITS AND METHODS FOR CANCELLING A REFLECTED WAVE - Method and circuits for cancelling reflected waves from a load are disclosed. An embodiment of the method includes transmitting a signal to the bad from a current source, wherein a transistor is connected in parallel with the current source at a node. The transistor is biased so that a reflected wave at the node will cause the drain to source voltage of the transistor to increase. The drain current of the first transistor increases by way of channel length modulation when the drain to source voltage increases, the increased drain current cancels the reflected wave. | 10-09-2014 |
20140306764 | CIRCUITS AND METHODS FOR COMPENSATING FOR MILLER CAPACITANCE - Amplifier circuits and methods of cancelling the Miller effects in amplifiers are disclosed herein. An embodiment of an amplifier circuit includes an input and an output. An amplifier is connected between the input and the output of the circuit. A voltage source is connected to the output, wherein the voltage source output is one hundred eighty degrees out of phase with the voltage output by the amplifier, and wherein the voltage source cancels gain due to the Miller effect of a Miller capacitance between the input and output. | 10-16-2014 |
20150070111 | SYSTEM FOR TRANSMITTING INFORMATION BETWEEN CIRCUITS - A system for transferring information from a first circuit to a second circuit includes first and second isolation elements coupled between the first circuit and the second circuit. A first transient filter is located on the second circuit and coupled to the first isolation element. A second transient filter is located on the second circuit and coupled to the second isolation element. A first ground is located on the first circuit, and a second ground is located on the second circuit. The first ground electrically floats relative to the second ground. | 03-12-2015 |
20150070949 | DEVICE FOR TRANSFERING POWER FROM A FIRST CIRCUIT TO A SECOND CIRCUIT - A power transfer system for transferring power from a first circuit to a second circuit by a differential signal generated in the first circuit includes a first isolation element for transmitting a first component of the differential signal between the first and second circuits. The system also includes a second isolation element for transmitting a second component of the differential signal between the first and second circuits. A digital rectifier is coupled to the first and second isolation elements for generating a rectified voltage in response to the first and second components of the differential signal. The system includes circuitry for monitoring the rectified voltage and generating a signal representative of the rectified voltage. The system also includes a controller for changing the rectified voltage in response to the signal representative of the rectified voltage. | 03-12-2015 |
Patent application number | Description | Published |
20090036080 | Multiple PLL high frequency receiver - A radio receiver includes a first PLL to provide a first local oscillator signal to convert an RF signal to an IF signal, and a second PLL to provide a second local oscillator signal to convert the IF signal to baseband. The first PLL operates at a higher frequency with optimized performance, but it has limited tuning ability. The second PLL operates at a lower frequency and has more tuning ability to compensate for the first PLL lack of it. The first PLL provides an inter-PLL control signal to the second PLL to influence the frequency at which the second PLL operates. | 02-05-2009 |
20090042528 | MILLIMETER-WAVE PHASE-LOCKED LOOP WITH INJECTION-LOCKED FREQUENCY DIVIDER USING QUARTER-WAVELENGTH TRANSMISSION LINE AND METHOD OF CALIBRATION - Embodiments of a millimeter-wave phase-locked loop with an injection-locked frequency divider (ILFD) are generally described herein. Other embodiments may be described and claimed. In some embodiments, the ILFD uses a quarter-wavelength transmission line. A method of calibrating an ILFD is also provided to allow the ILFD to operate at or near the center of its locking range for each of a plurality of VCO oscillating frequency bands. | 02-12-2009 |
20100237910 | High-Speed, Low-Power Driver System - A reduced power driver is described. This reduced power driver comprises: an input current driver for transmitting a current signal that is a fraction of a DC current signal; a first resistor coupled at one end to a first voltage supply; a first current driver coupled to the input current driver and a first switch control; a second switch coupled a first current driver output, another end of the first resistor, and the output control; a dynamic booster coupled between the first voltage supply and the output control; and wherein the reduced power driver is operative for selectively adding an overshoot current to the output control so that power consumption is reduced, while synchronizing the DC current signal with the overshoot current. | 09-23-2010 |
20120250484 | PROXIMITY SENSING SYSTEM - A data storage system for detecting a location of a head relative to a magnetic media is described. This system comprises arms, a preamplifier circuit coupled to the arms for controlling the arms, a proximity sensing system positioned within the preamplifier circuit, the proximity sensing system comprising: an input stage for transmitting an input sense signal; a programmable gain stage coupled to receive the input sense signal and operative for transmitting a gain signal in response to receiving the input sense signal; a multiplexer coupled to receive the gain signal and at least one control signal, the multiplexer operative for transmitting a multiplexed signal; a detector coupled to receive the multiplexed signal and a second control signal, the detector operative for transmitting an output signal; wherein an amplitude associated with the output signal enables detecting the location of the head. | 10-04-2012 |
Patent application number | Description | Published |
20090088347 | Treatment Fluid with Non-Symmetrical Peroxide Breaker and Method - A treatment fluid composition for treating a subterranean formation penetrated by a wellbore is formed from an aqueous fluid, a hydratable polymer and a water-soluble, non-symmetrical, inorganic peroxide breaking agent, which is capable of undergoing heterolytical cleavage. A method of treating a subterranean formation penetrated by a wellbore may also be performed by forming a treatment fluid from an aqueous hydrated polymer solution. This is combined with a water-soluble, non-symmetrical, heterolytically cleavable inorganic peroxide breaking agent. The treating fluid is introduced into the formation. An optional crosslinking agent capable of crosslinking the polymer may also be included. | 04-02-2009 |
20090221453 | Treatment Fluid With Oxidizer Breaker System and Method - A treatment fluid composition for treating a subterranean formation is formed from an aqueous fluid, a hydratable polymer and a polymer breaking system. The polymer breaking system includes an oxidizing breaking agent and an activator capable of providing a bisulfite ion source. A method of treating a subterranean formation may also be performed by forming a treatment fluid comprising an aqueous hydrated polymer solution and a polymer breaking system. The polymer breaking system includes a breaking agent of an oxidizer and an activator capable of providing a bisulfite ion source. The treatment fluid is introduced into the formation. | 09-03-2009 |
20090281004 | Composition and Method for Fluid Recovery from Well - A well treatment microemulsion for use in a subterranean formation is disclosed, the microemulsion comprises a solvent blend comprising a solvent and a co-solvent; a surfactant blend comprising a surfactant, wherein the surfactant blend is able to give formation intermediate wettability properties; an alcohol; and a carrier fluid; wherein the alcohol, the solvent and surfactant blends are combined with the carrier fluid to produce the well treatment microemulsion. By intermediate wettability it is meant that the water has an advancing contact angle on the surface between 62 and 133 degrees. The associate method of treating a subterranean formation of a well with the microemulsion and the associate method of modifying the wettability of the formation with the microemulsion are also disclosed. | 11-12-2009 |
20120241156 | SELECTIVE FLUID WITH ANCHORING AGENT FOR WATER CONTROL - Methods and apparatus for using a fluid within a subterranean formation including forming a fluid comprising an oil-soluble resin acid and an organosilicon compound and introducing the fluid to the formation, wherein the relative permeability of the formation increases, and wherein the production of water is reduced more than if no fluid was introduced to the formation. Methods and apparatus for reducing water production within a subterranean formation including forming a fluid comprising an oil-soluble resin acid and an organosilicon compound and introducing the fluid to the formation, wherein the production of water is reduced more than if no fluid was introduced to the formation. | 09-27-2012 |
20120298354 | TRIGGERING POLYMERIZATION ON-DEMAND FOR WATER CONTROL DOWNHOLE - Methods of sealing a subterranean formation including introducing a trigger-able fluid, the trigger-able fluid containing an ethylenically unsaturated monomer, into a subterranean formation, and using an electromagnetic trigger unit having a electromagnetic source to initiate polymerization of the ethylenically unsaturated monomer after at least a portion of the trigger-able fluid has permeated into the subterranean formation. | 11-29-2012 |
20120325471 | ENCAPSULATED MATERIALS AND THEIR USE IN OIL AND GAS WELLS - A subterranean formation penetrated by a wellbore is treated by introducing into the wellbore an encapsulated material comprising an encapsulating component formed from a regenerated ionic-liquid-dissolved compound and an active component that is encapsulated by the encapsulating component. The encapsulating material is then allowed to release the active component into the formation. In another treatment method, an encapsulated material comprising an encapsulating component and an active component that is encapsulated by the encapsulating component are introduced into the wellbore. The encapsulating component is degradable when subjected to electromagnetic radiation having a frequency of from about 300 MHz to about 300. The encapsulated material is then subjected to electromagnetic energy in the frequency range of from about 300 MHz to about 300 GHz to degrade the encapsulating component and facilitate the release the active component into the formation. | 12-27-2012 |
Patent application number | Description | Published |
20140182854 | FLUID LOSS CONTROL PILL WITH INTERNAL BREAKER AND METHOD - A method of treating a subterranean formation. The method may include providing a fluid loss control pill that comprises an aqueous base fluid, a gelling agent, and an internal breaker that is selected from the group consisting of inorganic delayed acids or inorganic salts. The method can include introducing the fluid loss control pill into a subterranean formation, allowing the internal breaker to reduce the viscosity of the pill after a delay period, and allowing the fluid loss control pill to break. | 07-03-2014 |
20140187450 | Internal Breaker for Fluid Loss Control Pills and Method - A method of treating a subterranean formation. The method may include providing a fluid-loss control pill that comprises an aqueous base fluid, a gelling agent, and an internal breaker that is selected from the group consisting of inorganic delayed acids or inorganic salts. The method can include introducing the fluid-loss control pill into a subterranean formation, allowing the internal breaker to reduce the viscosity of the pill after a delay period, and allowing the fluid-loss control pill to break. | 07-03-2014 |
20140338902 | POLYSACCHARIDE DELIVERY UNIT FOR WELLBORE TREATMENT AGENT AND METHOD - A method of treating a subterranean formation. The method may include providing a well treatment including a treatment complex formed of a treatment agent encapsulated, entrapped, or embedded in a polysaccharide, introducing the treatment complex into a wellbore through a subterranean formation, and allowing the treatment complex to release the treatment agent over a release time period. The method may include allowing the treatment complex to release the treatment agent after a delay time period from the introduction of the treatment complex into the wellbore. | 11-20-2014 |