Patents by Inventor Agnes Woo
Agnes Woo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9293584Abstract: Disclosed are various embodiments of FinFET semiconductor devices. A pair of matched capacitors can be formed that share a common source, drain and/or channel. Accordingly, the capacitance characteristics of each capacitor can be manufactured such that they are similar to one another. A resistor manufactured by employing FinFET techniques is also described. The resistor can be manufactured with an effective length that is greater than a distance traversed along a substrate by the resistor.Type: GrantFiled: November 2, 2011Date of Patent: March 22, 2016Assignee: BROADCOM CORPORATIONInventors: Xiangdong Chen, Henry Chen, Agnes Woo, Wei Xia
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Patent number: 9189043Abstract: Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. The PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required. If the PSE finds the PD to be non-compatible, the PSE can prevent the application of power to that PD device, protecting the PD from possible damage.Type: GrantFiled: March 22, 2013Date of Patent: November 17, 2015Assignee: Broadcom CorporationInventors: Pieter Vorenkamp, Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Patent number: 8782442Abstract: An apparatus and method for multi-point detection in a power source equipment (PSE) device is provided. During multi-point detection, a series of at least four currents is sequentially applied to a link port of the PSE device. Each current is applied during a different measurement interval. A voltage measurement sample is obtained for each of the measurement intervals. A difference in voltage between alternating voltage samples is determined and used by a detection module to determine whether a valid power device is coupled to the link port of the PSE.Type: GrantFiled: April 5, 2010Date of Patent: July 15, 2014Assignee: Broadcom CorporationInventors: Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Publication number: 20130105942Abstract: Disclosed are various embodiments of FinFET semiconductor devices. A pair of matched capacitors can be formed that share a common source, drain and/or channel. Accordingly, the capacitance characteristics of each capacitor can be manufactured such that they are similar to one another. A resistor manufactured by employing FinFET techniques is also described. The resistor can be manufactured with an effective length that is greater than a distance traversed along a substrate by the resistor.Type: ApplicationFiled: November 2, 2011Publication date: May 2, 2013Applicant: BROADCOM CORPORATIONInventors: Xiangdong Chen, Henry Chen, Agnes Woo, Wei Xia
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Patent number: 8432142Abstract: Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required.Type: GrantFiled: January 17, 2007Date of Patent: April 30, 2013Assignee: Broadcom CorporationInventors: Pieter Vorenkamp, Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Publication number: 20120250199Abstract: A Power over Ethernet electrostatic discharge protection circuit has a diode with an anode coupled to an Ethernet port and a cathode coupled to a non-collapsible clamp. The non-collapsible clamp is coupled to the cathode and ground. A transistor can be added, with the transistor drain coupled to the diode anode and the transistor source is coupled to ground.Type: ApplicationFiled: June 13, 2012Publication date: October 4, 2012Applicant: Broadcom CorporationInventor: Agnes WOO
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Patent number: 8213141Abstract: A Power over Ethernet electrostatic discharge protection circuit has a first diode with an anode coupled to a positive power port and a cathode coupled to an ESD protection port. A second diode has an anode coupled to ground and a cathode coupled to the positive power port. A third diode has an anode coupled to a negative power port and a cathode coupled to the ESD protection port.Type: GrantFiled: January 17, 2007Date of Patent: July 3, 2012Assignee: Broadcom CorporationInventor: Agnes Woo
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Patent number: 7936546Abstract: Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required.Type: GrantFiled: April 30, 2007Date of Patent: May 3, 2011Assignee: Broadcom CorporationInventors: Pieter Vorenkamp, Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Patent number: 7863871Abstract: Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required. The PSE controller also monitors for a Maintain Power Signature (MPS).Type: GrantFiled: April 30, 2007Date of Patent: January 4, 2011Assignee: Broadcom CorporationInventors: Pieter Vorenkamp, Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Publication number: 20100257381Abstract: An apparatus and method for multi-point detection in a power source equipment (PSE) device is provided. During multi-point detection, a series of at least four currents is sequentially applied to a link port of the PSE device. Each current is applied during a different measurement interval. A voltage measurement sample is obtained for each of the measurement intervals. A difference in voltage between alternating voltage samples is determined and used by a detection module to determine whether a valid power device is coupled to the link port of the PSE.Type: ApplicationFiled: April 5, 2010Publication date: October 7, 2010Applicant: BROADCOM CORPORATIONInventors: Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Patent number: 7711967Abstract: An apparatus and method for multi-point detection in a power source equipment (PSE) device is provided. During multi-point detection, a series of at least four currents is sequentially applied to a link port of the PSE device. Each current is applied during a different measurement interval. A voltage measurement sample is obtained for each of the measurement intervals. A difference in voltage between alternating voltage samples is determined and used by a detection module to determine whether a valid power device is coupled to the link port of the PSE.Type: GrantFiled: January 17, 2007Date of Patent: May 4, 2010Assignee: Broadcom CorporationInventors: Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Publication number: 20080040625Abstract: Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required. The PSE controller also monitors for a Maintain Power Signature (MPS).Type: ApplicationFiled: April 30, 2007Publication date: February 14, 2008Applicant: Broadcom CorporationInventors: Pieter Vorenkamp, Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Publication number: 20080036037Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programmable attenuation and a programmable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.Type: ApplicationFiled: July 26, 2007Publication date: February 14, 2008Applicant: Broadcom CorporationInventors: Agnes Woo, Kenneth Kindsfater, Fang Lu
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Publication number: 20070206774Abstract: Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required.Type: ApplicationFiled: April 30, 2007Publication date: September 6, 2007Applicant: Broadcom CorporationInventors: Pieter Vorenkamp, Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Publication number: 20070170909Abstract: Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required.Type: ApplicationFiled: January 17, 2007Publication date: July 26, 2007Applicant: Broadcom CorporationInventors: Pieter Vorenkamp, Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Publication number: 20070165548Abstract: An apparatus and method for multi-point detection in a power source equipment (PSE) device is provided. During multi-point detection, a series of at least four currents is sequentially applied to a link port of the PSE device. Each current is applied during a different measurement interval. A voltage measurement sample is obtained for each of the measurement intervals. A difference in voltage between alternating voltage samples is determined and used by a detection module to determine whether a valid power device is coupled to the link port of the PSE.Type: ApplicationFiled: January 17, 2007Publication date: July 19, 2007Applicant: Broadcom CorporationInventors: Agnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
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Publication number: 20070165345Abstract: A Power over Ethernet electrostatic discharge protection circuit has a first diode with an anode coupled to a positive power port and a cathode coupled to an ESD protection port. A second diode has an anode coupled to ground and a cathode coupled to the positive power port. A third diode has an anode coupled to a negative power port and a cathode coupled to the ESD protection port.Type: ApplicationFiled: January 17, 2007Publication date: July 19, 2007Applicant: Broadcom CorporationInventor: Agnes Woo
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Patent number: 7211843Abstract: The present invention relates to systems and methods for programming a memory cell. More specifically, the present invention relates to a controlled application of current to a memory cell over a controlled time period. The invention utilizes a current mirror configuration having a first transistor and a second transistor, wherein the second transistor is coupled to the memory cell. Programming of the memory cell includes applying a voltage to the first transistor, whereby a first current is generated in the first transistor. A gate of the second transistor is coupled to the first transistor, whereby a second current is generated in the second transistor. The second current is proportional to the first current. The second current is provided to the memory cell, whereby the second current programs the memory cell.Type: GrantFiled: January 31, 2003Date of Patent: May 1, 2007Assignee: Broadcom CorporationInventors: Khim L. Low, Todd L. Brooks, Agnes Woo, Akira Ito
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Publication number: 20070007598Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.Type: ApplicationFiled: September 15, 2006Publication date: January 11, 2007Applicant: Broadcom CorporationInventors: Agnes Woo, Kenneth Kindsfater, Fang Lu
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Publication number: 20060152870Abstract: An I/O ESD protection configuration of an integrated circuit that includes an ESD protection circuit connected between an I/O pad and an internal circuit at a first node and to an inductor at a second node. The inductor is connected between the second node and an external power supply. The external power supply provides a high reverse bias voltage across a diode of the ESD protection circuit. An ESD clamp is connected between the second node and a ground. An ESD discharge current is shunted through the ESD protection circuit and through the ESD clamp during a positive I/O ESD event. The inductor can be chosen to tune out a parasitic capacitance of the ESD clamp. The inductor can also block high frequency signals between the I/O pad and the external power supply, thereby minimizing the parasitic capacitance of the diode of the ESD protection circuit at high frequency.Type: ApplicationFiled: July 6, 2005Publication date: July 13, 2006Applicant: Broadcom CorporationInventors: Chun-Ying Chen, Agnes Woo