Patents by Inventor Yanli Fan
Yanli Fan 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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Publication number: 20190097593Abstract: An offset cancellation circuit and method are provided where successive stages of cascaded amplifiers are operated in a saturated state. Biasing is provided, by a feedback amplifier, connected in a feedback loop for each cascaded amplifier, so as to be responsive, in a non-saturated state, to the input of an associated amplifier stage operating in the saturated state.Type: ApplicationFiled: September 26, 2017Publication date: March 28, 2019Inventors: Jikai Chen, Gerd Schuppener, Yanli Fan
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Patent number: 10236878Abstract: An isolator device (200) includes a differential transmitter, a differential receiver, and a pair of differential signal lines between the differential transmitter and the differential receiver. The isolator device also comprises isolation circuitry along the pair of differential signal lines, wherein the isolation circuitry includes a transmitter-side capacitor for each differential signal line, a receiver-side capacitor for each differential signal line, and at least one common-mode voltage regulation component.Type: GrantFiled: June 5, 2018Date of Patent: March 19, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Jikai Chen, Yanli Fan
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Publication number: 20170257098Abstract: A driver includes first and second resistors coupled to a supply voltage and coupled to pairs of main transistors at positive and negative output nodes. The first and second pairs of main transistors provide emphasis and de-emphasis on the positive and negative output nodes. The driver also includes a delay inverter, a pull up booster and a pull down booster. The delay inverter delays and inverts each of a pair of differential input signals to provide delayed and inverted differential signals. The pull up booster provides a bypass current path that bypasses the first and second resistors but includes at least some of the first and second pairs of main transistors. The pull down booster provides an additional current path from the supply voltage through the first or second resistor to ground.Type: ApplicationFiled: May 19, 2017Publication date: September 7, 2017Inventors: Weicheng Zhang, Huanzhang Huang, Yanli Fan, Roland Sperlich
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Patent number: 9716500Abstract: Driving a back-gate of a transistor with a follower signal that corresponds to an information signal. At least some of the illustrative embodiments are methods including: passing an information signal from a drain terminal to a source terminal of a main field effect transistor (FET), the information signal has a peak-to-peak voltage; generating a follower signal that corresponds to the information signal, the follower signal electrically isolated from the information signal, and the follower signal has a peak-to-peak voltage lower than the peak-to-peak voltage of the information signal; and applying the follower signal to a back-gate of the main FET.Type: GrantFiled: August 5, 2015Date of Patent: July 25, 2017Assignee: Texas Instruments IncorporatedInventors: Yaqi Hu, Yanli Fan
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Patent number: 9660652Abstract: A driver includes first and second resistors coupled to a supply voltage and coupled to pairs of main transistors at positive and negative output nodes. The first and second pairs of main transistors provide emphasis and de-emphasis on the positive and negative output nodes. The driver also includes a delay inverter, a pull up booster and a pull down booster. The delay inverter delays and inverts each of a pair of differential input signals to provide delayed and inverted differential signals. The pull up booster provides a bypass current path that bypasses the first and second resistors but includes at least some of the first and second pairs of main transistors. The pull down booster provides an additional current path from the supply voltage through the first or second resistor to ground.Type: GrantFiled: September 8, 2015Date of Patent: May 23, 2017Assignee: Texas Instruments IncorporatedInventors: Weicheng Zhang, Huanzhang Huang, Yanli Fan, Roland Sperlich
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Patent number: 9337789Abstract: A differential receiver with reduced common mode induced propagation delay variance. One implementation of a differential receiver includes a first differential amplifier, a second differential amplifier, and a first current source. The first differential amplifier includes a first transistor pair. The second differential amplifier includes a second transistor pair. The first current source is coupled to a drain node of a first transistor of the first transistor pair. The first current source is configured to generate a variable first current at the drain node as of function of a sum of a variable tail current of the first differential amplifier and a variable tail current of the second differential amplifier.Type: GrantFiled: October 8, 2013Date of Patent: May 10, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Weicheng Zhang, Huanzhang Huang, Yanli Fan, Mark W. Morgan
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Publication number: 20160087633Abstract: A driver includes first and second resistors coupled to a supply voltage and coupled to pairs of main transistors at positive and negative output nodes. The first and second pairs of main transistors provide emphasis and de-emphasis on the positive and negative output nodes. The driver also includes a delay inverter, a pull up booster and a pull down booster. The delay inverter delays and inverts each of a pair of differential input signals to provide delayed and inverted differential signals. The pull up booster provides a bypass current path that bypasses the first and second resistors but includes at least some of the first and second pairs of main transistors. The pull down booster provides an additional current path from the supply voltage through the first or second resistor to ground.Type: ApplicationFiled: September 8, 2015Publication date: March 24, 2016Inventors: Weicheng ZHANG, Huanzhang HUANG, Yanli FAN, Roland SPERLICH
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Publication number: 20160043722Abstract: Driving a back-gate of a transistor with a follower signal that corresponds to an information signal. At least some of the illustrative embodiments are methods including: passing an information signal from a source terminal to an drain terminal of a main field effect transistor (FET), the information signal has a peak-to-peak voltage; generating a follower signal that corresponds to the information signal, the follower signal electrically isolated from the information signal, and the follower signal has a peak-to-peak voltage lower than the peak-to-peak voltage of the information signal; and applying the follower signal to a back-gate of the main FET.Type: ApplicationFiled: August 5, 2015Publication date: February 11, 2016Inventors: Yaqi HU, Yanli FAN
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Patent number: 9240619Abstract: An apparatus is provided. The apparatus generally comprises a plurality of pairs of differential transmission lines. The plurality of pairs of differential transmission lines includes a set of pairs of differential transmission lines with each pair of differential transmission lines from the set of pairs of differential transmission lines including at least one twist to alternate current direction. Also, the plurality of differential transmission lines are arranged such that alternating current directions substantially eliminate cross-talk across the plurality of pairs of differential transmission lines.Type: GrantFiled: April 28, 2011Date of Patent: January 19, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Gregory E. Howard, Amneh Akour, Yanli Fan, Karlheinz Muth, Mark W. Morgan
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Publication number: 20140189628Abstract: A system is provided for use with circuit layout design data having a set of differential pairs and a set of bond wire pairs. A layout portion can receive the circuit layout design data. A crosstalk calculating portion can determine a first amount of crosstalk in a circuit corresponding to the circuit layout design data. A modifier can modify the circuit layout design data into modified circuit layout design data such that one of the set of differential pairs and the set of bond wire pairs includes a crossover. The crosstalk calculating portion can further determine a second amount of crosstalk in a circuit corresponding to the modified circuit layout design data. An optimizer can compare the first amount of crosstalk with the second amount of crosstalk to generate optimized circuit layout design data. A layout designer can output the optimized circuit layout design data.Type: ApplicationFiled: December 27, 2012Publication date: July 3, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Gregory Eric Howard, Andy Quang Tran, Yanli Fan, Kartheinz Muth
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Patent number: 8769469Abstract: A system is provided for use with circuit layout design data having a set of differential pairs and a set of bond wire pairs. A layout portion can receive the circuit layout design data. A crosstalk calculating portion can determine a first amount of crosstalk in a circuit corresponding to the circuit layout design data. A modifier can modify the circuit layout design data into modified circuit layout design data such that one of the set of differential pairs and the set of bond wire pairs includes a crossover. The crosstalk calculating portion can further determine a second amount of crosstalk in a circuit corresponding to the modified circuit layout design data. An optimizer can compare the first amount of crosstalk with the second amount of crosstalk to generate optimized circuit layout design data. A layout designer can output the optimized circuit layout design data.Type: GrantFiled: December 27, 2012Date of Patent: July 1, 2014Assignee: Texas Instruments IncorporatedInventors: Gregory Eric Howard, Andy Quang Tran, Yanli Fan, Kartheinz Muth
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Publication number: 20140159814Abstract: A differential receiver with reduced common mode induced propagation delay variance. One implementation of a differential receiver includes a first differential amplifier, a second differential amplifier, and a first current source. The first differential amplifier includes a first transistor pair. The second differential amplifier includes a second transistor pair. The first current source is coupled to a drain node of a first transistor of the first transistor pair. The first current source is configured to generate a variable first current at the drain node as of function of a sum of a variable tail current of the first differential amplifier and a variable tail current of the second differential amplifier.Type: ApplicationFiled: October 8, 2013Publication date: June 12, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Weicheng Zhang, Huanzhang Huang, Yanli Fan, Mark W. Morgan
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Patent number: 8681848Abstract: An apparatus for equalizing channels is provided, which is generally transparent to link training. The apparatus generally includes equalization paths formed by an input circuit, a crossbar, and an output circuit and a controller. Each equalization path is coupled to at least one of the channels, and a controller has a VGA loop, a crossbar loop, and a driver loop. The AGC loop receives a first reference voltage and provides a gain control signal to the input circuit, and the gain control network comprises a replica of at least one of the equalization paths. The crossbar loop receives a second reference voltage and provides a crossbar control signal to the crossbar. The driver loop receives a third reference voltage and provides a driver control signal for the output circuit.Type: GrantFiled: October 28, 2011Date of Patent: March 25, 2014Assignees: Texas Instruments Incorporated, Texas Instruments Deutschland GmbHInventors: Yaqi Hu, Yanli Fan, Huawen Jin, Ulrich Schacht, Karl Muth, Mark W. Morgan
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Patent number: 8495273Abstract: In versions 1.1a and 1.2 of the DISPLAYPORT™ standard, capacitors are used between a sourcing circuit and a switch for the auxiliary channel. As a result, these capacitors are generally uncharged when the switch activates the auxiliary channel, which can result in errors. Here, a switch is employed that uses precharge circuits to precharge these capacitors. Thus, errors due to charging of these capacitors can be reduced.Type: GrantFiled: July 16, 2010Date of Patent: July 23, 2013Assignee: Texas Instruments IncorporatedInventors: MD Anwar Sadat, Yanli Fan, Huawen Jin, Woo J. Kim
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Publication number: 20130107933Abstract: An apparatus for equalizing channels is provided, which is generally transparent to link training. The apparatus generally includes equalization paths formed by an input circuit, a crossbar, and an output circuit and a controller. Each equalization path is coupled to at least one of the channels, and a controller has a VGA loop, a crossbar loop, and a driver loop. The AGC loop receives a first reference voltage and provides a gain control signal to the input circuit, and the gain control network comprises a replica of at least one of the equalization paths. The crossbar loop receives a second reference voltage and provides a crossbar control signal to the crossbar. The driver loop receives a third reference voltage and provides a driver control signal for the output circuit.Type: ApplicationFiled: October 28, 2011Publication date: May 2, 2013Applicant: Texas Instruments IncorporatedInventors: Yaqi Hu, Yanli Fan, Huawen Jin, Ulrich Schacht, Karl Muth, Mark W. Morgan
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Patent number: 8324949Abstract: Quadrature clocking schemes are widely used in modern communications systems, but often suffer from phase imbalance. Conventional solutions that attempt to address this phase imbalance, however, are generally large and use a substantial amount of power. Here, however, a correction circuit is provided that can locally correct for phase imbalance without the need for bulky and high power consuming circuitry.Type: GrantFiled: October 8, 2010Date of Patent: December 4, 2012Assignee: Texas Instruments IncorporatedInventors: Alexander Cherkassky, David Elwart, Huanzhang Huang, Li Yang, Matt Rowley, Mark W. Morgan, Yanli Fan, Yonghui Tang
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Publication number: 20120275122Abstract: An apparatus is provided. The apparatus generally comprises a plurality of pairs of differential transmission lines. The plurality of pairs of differential transmission lines includes a set of pairs of differential transmission lines with each pair of differential transmission lines from the set of pairs of differential transmission lines including at least one twist to alternate current direction. Also, the plurality of differential transmission lines are arranged such that alternating current directions substantially eliminate cross-talk across the plurality of pairs of differential transmission lines.Type: ApplicationFiled: April 28, 2011Publication date: November 1, 2012Applicant: Texas Instruments IncorporatedInventors: Gregory E. Howard, Amneh Akour, Yanli Fan, Karlheinz Muth, Mark W. Morgan
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Patent number: 8213638Abstract: Methods and apparatus to provide an equalizer for analog adaptive control are disclosed. An example equalizer described herein includes a high frequency amplifier to receive an input signal and to amplify a high frequency portion of the input signal, a low frequency amplifier to receive the input signal and to amplify a low frequency portion of the input signal, and a weight factor controller to control a gain of the high frequency amplifier and a gain of the low frequency amplifier.Type: GrantFiled: February 20, 2007Date of Patent: July 3, 2012Assignee: Texas Instruments IncorporatedInventors: Yanli Fan, Mark W. Morgan
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Publication number: 20120086489Abstract: Quadrature clocking schemes are widely used in modern communications systems, but often suffer from phase imbalance. Conventional solutions that attempt to address this phase imbalance, however, are generally large and use a substantial amount of power. Here, however, a correction circuit is provided that can locally correct for phase imbalance without the need for bulky and high power consuming circuitry.Type: ApplicationFiled: October 8, 2010Publication date: April 12, 2012Applicant: Texas Instruments IncorporatedInventors: Alexander Cherkassky, David Elwart, Huanzhang Huang, Li Yang, Matt Rowley, Mark W. Morgan, Yanli Fan, Yonghui Tang
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Publication number: 20120013390Abstract: In versions 1.1a and 1.2 of the DISPLAYPORT™ standard, capacitors are used between a sourcing circuit and a switch for the auxiliary channel. As a result, these capacitors are generally uncharged when the switch activates the auxiliary channel, which can result in errors. Here, a switch is employed that uses precharge circuits to precharge these capacitors. Thus, errors due to charging of these capacitors can be reduced.Type: ApplicationFiled: July 16, 2010Publication date: January 19, 2012Applicant: Texas Instruments IncorporatedInventors: MD Anwar Sadat, Yanli Fan, Huawen Jin, Woo J. Kim