Patents by Inventor Tom W. Kwan
Tom W. Kwan 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: 10691255Abstract: Frequency selective analog front-end circuitry, used to convert a sensed charge signal to an analog voltage is disclosed. In one aspect, the frequency selective analog front-end circuitry includes an op-amp having an output, an inverting input and a noninverting input, a first resistor connected between the terminal of the first capacitor and the inverting input of the op-amp, a second capacitor connected between the output of the op-amp and the inverting input of the op-amp, a second resistor connected between the output of the op-amp and the inverting input of the op-amp, a third capacitor connected between the terminal of the first capacitor and the noninverting input of the op-amp, and a third resistor connected between the noninverting input of the op-amp and a reference voltage.Type: GrantFiled: January 23, 2019Date of Patent: June 23, 2020Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITEDInventors: Fang Lin, Tom W. Kwan, Feng Su
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Patent number: 9007246Abstract: A method and apparatus is disclosed to compensate for gate leakage currents of thin oxide devices that have very thin oxide layers in a current mirror of a digital-to-analog converter (DAC). The DAC converts a digital input signal from a digital representation in a digital signaling domain to an analog representation in an analog signaling domain to provide an analog output signal. The DAC uses one or more transistors to convert the digital input signal from the digital representation to the analog representation. These transistors are typically implemented using thin oxide devices that have very thin oxide layers and corresponding gate leakage currents that are associated with these very thin oxide layers. The current-steering DAC provides these gate leakage currents independent of its corresponding, reference source without any substantial affect upon its full scale output.Type: GrantFiled: April 22, 2013Date of Patent: April 14, 2015Assignee: Broadcom CorporationInventors: Ovidiu Bajdechi, Tom W. Kwan
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Patent number: 8982093Abstract: An interference tolerant capacitive touch sensor readout circuit having improved power and area efficiency is disclosed. Interference rejection for the capacitive touch sensing system is realized by transferring charge between a capacitive touch sensor and the readout circuit at frequencies outside bands where a level of interference is unacceptable. Improved power and area efficient come from the simplicity of the readout circuit which comprises a switched-capacitor integrator, a comparator, a digital accumulator and number of switches for driving a touch sensor and a capacitive feedback loop. The readout circuit is capable of interfacing with both self and mutual capacitance sensor to achieve compatibility with a larger collection of sensors and provides additional sensing and diagnostic functionalities.Type: GrantFiled: January 30, 2013Date of Patent: March 17, 2015Assignee: Broadcom CorporationInventors: Guo Wen Wei, Tom W. Kwan
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Patent number: 8841963Abstract: Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal levels using semi-conductor switches. Such switches may introduce non-linearities in the signal. By isolating the switches from the signal path linearity of the PGA can be improved.Type: GrantFiled: February 2, 2006Date of Patent: September 23, 2014Assignee: Broadcom CorporationInventors: Arya R. Behzad, Klaas Bult, Ramon A. Gomez, Chi-Hung Lin, Tom W. Kwan, Oscar E. Agazzi, John L. Creigh, Mehdi Hatamian, David E. Kruse, Arthur Abnous, Henry Samueli
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Publication number: 20140176482Abstract: An interference tolerant capacitive touch sensor readout circuit having improved power and area efficiency is disclosed. Interference rejection for the capacitive touch sensing system is realized by transferring charge between a capacitive touch sensor and the readout circuit at frequencies outside bands where a level of interference is unacceptable. Improved power and area efficient come from the simplicity of the readout circuit which comprises a switched-capacitor integrator, a comparator, a digital accumulator and number of switches for driving a touch sensor and a capacitive feedback loop. The readout circuit is capable of interfacing with both self and mutual capacitance sensor to achieve compatibility with a larger collection of sensors and provides additional sensing and diagnostic functionalities.Type: ApplicationFiled: January 30, 2013Publication date: June 26, 2014Applicant: BROADCOM CORPORATIONInventors: Guo Wen Wei, Tom W. Kwan
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Patent number: 8754746Abstract: Operating a game controller to identify a user by receiving touch pad input from at least one touch sensitive pad of the game controller that has a plurality of touch sensitive elements. The touch pad input corresponds to the user's touch of at least some of the plurality of touch sensitive elements. The touch pad input is at least partially processed by processing circuitry of the game controller and transmitted to a game console via a communications interface of the game controller for processing of the at least partially processed touch pad input to identify the user via pattern recognition. At least partially processing the touch pad input can be by identifying at least one finger orientation, at least one finger spacing, at least one finger width, a plurality of finger knuckle/joint locations, and/or a plurality of finger lengths based upon the touch pad input.Type: GrantFiled: October 26, 2010Date of Patent: June 17, 2014Assignee: Broadcom CorporationInventors: Bob Lukas, David A. Sobel, Monika Gupta, Qiang Fu, Sumant Ranganathan, Jeyhan Karaoguz, Tom W. Kwan, Xinyu Yu
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Patent number: 8614621Abstract: Operating a remote control to identify a user by receiving touch pad input from at least one touch sensitive element of the remote control that has a plurality of touch sensitive elements. The touch pad input corresponds to the user's touch of at least some of the plurality of touch sensitive elements. The touch pad input is at least partially processed by processing circuitry of the remote control and transmitted to a multimedia system console via a communications interface of the remote control for processing of the at least partially processed touch pad input to identify the user via pattern recognition. At least partially processing the touch pad input can be by identifying at least one finger orientation, at least one finger spacing, at least one finger width, a plurality of finger knuckle/joint locations, and/or a plurality of finger lengths based upon the touch pad input.Type: GrantFiled: October 26, 2010Date of Patent: December 24, 2013Assignee: Broadcom CorporationInventors: David A. Sobel, Qiang Fu, Sumant Ranganathan, John Walley, Pieter Vorenkamp, Jeyhan Karaoguz, Tom W. Kwan
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Patent number: 8570707Abstract: The present invention provides several scalable integrated circuit high density capacitors and their layout techniques. The capacitors are scaled, for example, by varying the number of metal layers and/or the area of the metal layers used to from the capacitors. The capacitors use different metallization patterns to form the metal layers, and different via patterns to couple adjacent metal layers. In embodiments, optional shields are included as the top-most and/or bottom-most layers of the capacitors, and/or as side shields, to reduce unwanted parasitic capacitance.Type: GrantFiled: June 16, 2011Date of Patent: October 29, 2013Assignee: Broadcom CorporationInventors: Victor Chiu-Kit Fong, Eric Bruce Blecker, Tom W. Kwan, Ning Li, Sumant Rangnathan, Chao Tang, Pieter Vorenkamp
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Publication number: 20130234788Abstract: A method and apparatus is disclosed to compensate for gate leakage currents of thin oxide devices that have very thin oxide layers in a current mirror of a digital-to-analog converter (DAC). The DAC converts a digital input signal from a digital representation in a digital signaling domain to an analog representation in an analog signaling domain to provide an analog output signal. The DAC uses one or more transistors to convert the digital input signal from the digital representation to the analog representation. These transistors are typically implemented using thin oxide devices that have very thin oxide layers and corresponding gate leakage currents that are associated with these very thin oxide layers. The current-steering DAC provides these gate leakage currents independent of its corresponding, reference source without any substantial affect upon its full scale output.Type: ApplicationFiled: April 22, 2013Publication date: September 12, 2013Applicant: Broadcom CorporationInventors: Ovidiu BAJDECHI, Tom W. Kwan
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Patent number: 8441381Abstract: A method and apparatus is disclosed to compensate for gate leakage currents of thin oxide devices that have very thin oxide layers in a current mirror of a digital-to-analog converter (DAC). The DAC converts a digital input signal from a digital representation in a digital signaling domain to an analog representation in an analog signaling domain to provide an analog output signal. The DAC uses one or more transistors to convert the digital input signal from the digital representation to the analog representation. These transistors are typically implemented using thin oxide devices that have very thin oxide layers and corresponding gate leakage currents that are associated with these very thin oxide layers. The current-steering DAC provides these gate leakage currents independent of its corresponding reference source without any substantial affect upon its full scale output.Type: GrantFiled: September 27, 2011Date of Patent: May 14, 2013Assignee: Broadcom CorporationInventors: Ovidiu Bajdechi, Tom W. Kwan
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Publication number: 20130076549Abstract: A method and apparatus is disclosed to compensate for gate leakage currents of thin oxide devices that have very thin oxide layers in a current mirror of a digital-to-analog converter (DAC). The DAC converts a digital input signal from a digital representation in a digital signaling domain to an analog representation in an analog signaling domain to provide an analog output signal. The DAC uses one or more transistors to convert the digital input signal from the digital representation to the analog representation. These transistors are typically implemented using thin oxide devices that have very thin oxide layers and corresponding gate leakage currents that are associated with these very thin oxide layers. The current-steering DAC provides these gate leakage currents independent of its corresponding reference source without any substantial affect upon its full scale output.Type: ApplicationFiled: September 27, 2011Publication date: March 28, 2013Applicant: BROADCOM CORPORATIONInventors: Ovidiu Bajdechi, Tom W. Kwan
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Publication number: 20120018843Abstract: The present invention provides several scalable integrated circuit high density capacitors and their layout techniques. The capacitors are scaled, for example, by varying the number of metal layers and/or the area of the metal layers used to from the capacitors. The capacitors use different metallization patterns to form the metal layers, and different via patterns to couple adjacent metal layers. In embodiments, optional shields are included as the top-most and/or bottom-most layers of the capacitors, and/or as side shields, to reduce unwanted parasitic capacitance.Type: ApplicationFiled: June 16, 2011Publication date: January 26, 2012Applicant: Broadcom CorporationInventors: Victor Chiu-Kit Fong, Eric Bruce Blecker, Tom W. Kwan, Ning Li, Sumant Rangnathan, Chao Tang, Pieter Vorenkamp
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Patent number: 8045066Abstract: 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: GrantFiled: September 16, 2010Date of Patent: October 25, 2011Assignee: Broadcom CorporationInventors: Pieter Vorenkamp, Klaas Bult, Frank Carr, Christopher M. Ward, Ralph Duncan, Tom W. Kwan, James Y. C. Chang, Haideh Khorramabadi
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Patent number: 8000083Abstract: The present invention provides several scalable integrated circuit high density capacitors and their layout techniques. The capacitors are scaled, for example, by varying the number of metal layers and/or the area of the metal layers used to form the capacitors. The capacitors use different metallization patterns to form the metal layers, and different via patterns to couple adjacent metal layers. In embodiments, optional shields are included as the top-most and/or bottom-most layers of the capacitors, and/or as side shields, to reduce unwanted parasitic capacitance.Type: GrantFiled: July 29, 2009Date of Patent: August 16, 2011Assignee: Broadcom CorporationInventors: Victor Chiu-Kit Fong, Eric Bruce Blecker, Tom W. Kwan, Ning Li, Sumant Ranganathan, Chao Tang, Pieter Vorenkamp
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Patent number: 7995679Abstract: Provided are a method and system for digitizing a sensor model output signal. The system includes a filter, a demodulator coupled to the filter, a DC offset cancellation mechanism coupled to the demodulator, and an analog to digital converter (ADC). The ADC is directly coupled to the demodulator and the DC offset cancellation mechanism.Type: GrantFiled: April 27, 2005Date of Patent: August 9, 2011Assignee: Broadcom CorporationInventors: Sumant Ranganathan, Tom W. Kwan, Hung-Sung Li
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Patent number: 7978456Abstract: The present invention provides several scalable integrated circuit high density capacitors and their layout techniques. The capacitors are scaled, for example, by varying the number of metal layers and/or the area of the metal layers used to from the capacitors. The capacitors use different metallization patterns to form the metal layers, and different via patterns to couple adjacent metal layers. In embodiments, optional shields are included as the top-most and/or bottom-most layers of the capacitors, and/or as side shields, to reduce unwanted parasitic capacitance.Type: GrantFiled: July 29, 2009Date of Patent: July 12, 2011Assignee: Broadcom CorporationInventors: Victor Chiu-Kit Fong, Eric Bruce Blecker, Tom W. Kwan, Ning Li, Sumant Ranganathan, Chao Tang, Pieter Vorenkamp
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Publication number: 20110118027Abstract: Operating a gaming system having a game console and a game controller by receiving touch pad input from at least one touch sensitive pad of the game controller that has a plurality of touch sensitive elements. The touch pad input corresponds to a user's touch of at least some of the plurality of touch sensitive elements. The touch pad input is at least partially processed by processing circuitry of the game controller to produce partially processed touch pad input and transmitted from the game controller to the game console via communications interfaces of the game controller and the game console. The game console processes the at least partially processed touch pad input to produce game alteration data. The at least one corresponding game operation is altered based upon the game alteration data.Type: ApplicationFiled: October 26, 2010Publication date: May 19, 2011Applicant: BROADCOM CORPORATIONInventors: BOB LUKAS, DAVID A. SOBEL, QIANG FU, JEYHAN KARAOGUZ, TOM W. KWAN
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Publication number: 20110118029Abstract: Operating a game controller by receiving touch pad input from at least one touch sensitive pad of the game controller that has a plurality of touch sensitive elements. The touch pad input corresponds to the user's touch of at least some of the plurality of touch sensitive elements. The touch pad input is at least partially processed by processing circuitry of the game controller and the at least partially processed touch pad input is transmitted to a game console via a communications interface of the game controller for use as gaming input. At least partially processing the touch pad input can be by determining hand/foot position, changes in hand/foot position, hand grip/foot pressure, changes in hand grip/foot pressure based upon the touch pad input.Type: ApplicationFiled: October 26, 2010Publication date: May 19, 2011Applicant: BROADCOM CORPORATIONInventors: BOB LUKAS, DAVID A. SOBEL, QIANG FU, SUMANT RANGANATHAN, JEYHAN KARAOGUZ, TOM W. KWAN
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Publication number: 20110115604Abstract: Operating a remote control to identify a user by receiving touch pad input from at least one touch sensitive element of the remote control that has a plurality of touch sensitive elements. The touch pad input corresponds to the user's touch of at least some of the plurality of touch sensitive elements. The touch pad input is at least partially processed by processing circuitry of the remote control and transmitted to a multimedia system console via a communications interface of the remote control for processing of the at least partially processed touch pad input to identify the user via pattern recognition. At least partially processing the touch pad input can be by identifying at least one finger orientation, at least one finger spacing, at least one finger width, a plurality of finger knuckle/joint locations, and/or a plurality of finger lengths based upon the touch pad input.Type: ApplicationFiled: October 26, 2010Publication date: May 19, 2011Applicant: BROADCOM CORPORATIONInventors: DAVID A. SOBEL, QIANG FU, SUMANT RANGANATHAN, JOHN WALLEY, PIETER VORENKAMP, JEYHAN KARAOGUZ, TOM W. KWAN
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Publication number: 20110118026Abstract: Operating a game controller to identify a user by receiving touch pad input from at least one touch sensitive pad of the game controller that has a plurality of touch sensitive elements. The touch pad input corresponds to the user's touch of at least some of the plurality of touch sensitive elements. The touch pad input is at least partially processed by processing circuitry of the game controller and transmitted to a game console via a communications interface of the game controller for processing of the at least partially processed touch pad input to identify the user via pattern recognition. At least partially processing the touch pad input can be by identifying at least one finger orientation, at least one finger spacing, at least one finger width, a plurality of finger knuckle/joint locations, and/or a plurality of finger lengths based upon the touch pad input.Type: ApplicationFiled: October 26, 2010Publication date: May 19, 2011Applicant: BROADCOM CORPORATIONInventors: BOB LUKAS, DAVID A. SOBEL, MONIKA GUPTA, QIANG FU, SUMANT RANGANATHAN, JEYHAN KARAOGUZ, TOM W. KWAN, XINYU YU