Patents by Inventor Tallam VISHWANATH
Tallam VISHWANATH 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: 20240162912Abstract: This description relates generally to piecewise temperature compensation. In an example, a circuit includes a knee code selector that can be configured to set a knee point temperature for a correction current responsive to a respective knee point temperature code of knee point temperature codes and a respective temperature sense signal of temperature sense signals. The circuit includes an output circuit that can be configured to provide the correction current responsive to the respective temperature sense signal and temperature voltages, and a trim digital to analog converter (DAC) that can be configured to provide a piecewise compensation current responsive to the correction current and a respective trim code of trim codes.Type: ApplicationFiled: January 26, 2024Publication date: May 16, 2024Inventors: Tallam Vishwanath, Sandeep Shylaja Krishnan
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Publication number: 20240097621Abstract: Described embodiments include an integrated circuit for temperature gradient compensation of a bandgap voltage. A bandgap core circuit has a bandgap feedback input, a bandgap adjustment input and a bandgap reference output. A resistor is coupled between the bandgap adjustment input and a ground terminal. An offset and slope correction circuit has an offset correction output that is coupled to the bandgap adjustment input. A signal at the offset correction output is trimmed at an ambient temperature. A thermal error cancellation (TEC) circuit has a TEC output coupled to the bandgap adjustment input. The TEC circuit includes first and second temperature sensors that are located apart from each other. A signal at the TEC output is responsive to temperatures at the first and second temperature sensors. An amplifier has an amplifier input and an amplifier output. The amplifier input is coupled to the bandgap reference output.Type: ApplicationFiled: November 29, 2023Publication date: March 21, 2024Inventors: Sandeep Shylaja Krishnan, Akshay Yashwant Jadhav, Tallam Vishwanath
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Patent number: 11929755Abstract: This description relates generally to piecewise temperature compensation. In an example, a circuit includes a knee code selector that can be configured to set a knee point temperature for a correction current responsive to a respective knee point temperature code of knee point temperature codes and a respective temperature sense signal of temperature sense signals. The circuit includes an output circuit that can be configured to provide the correction current responsive to the respective temperature sense signal and temperature voltages, and a trim digital to analog converter (DAC) that can be configured to provide a piecewise compensation current responsive to the correction current and a respective trim code of trim codes.Type: GrantFiled: October 29, 2021Date of Patent: March 12, 2024Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Tallam Vishwanath, Sandeep Shylaja Krishnan
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Patent number: 11914411Abstract: A bandgap reference circuit includes first through fourth bipolar junction transistors (BJTs). The base and collector of the first BJT are shorted together. The second BJT is coupled to the first BJT via a first resistor. The base of the third BJT is coupled to the base of the first BJT. The base and collector of the fourth BJT are coupled together and also are coupled to the base of the second BJT. A second resistor is coupled to the fourth emitter of the fourth BJT. A third resistor is coupled to the second resistor and to the emitter of the second BJT. An operational amplifier has a first input coupled to the first resistor and the collector of the second BJT, a second input coupled to the emitter of the third BJT and the collector of the fourth BJT, and an output coupled to the collectors of the first and third BJTs.Type: GrantFiled: May 7, 2021Date of Patent: February 27, 2024Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sandeep Shylaja Krishnan, Tallam Vishwanath, Akshay Yashwant Jadhav
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Patent number: 11876490Abstract: Described embodiments include an integrated circuit for temperature gradient compensation of a bandgap voltage. A bandgap core circuit has a bandgap feedback input, a bandgap adjustment input and a bandgap reference output. A resistor is coupled between the bandgap adjustment input and a ground terminal. An offset and slope correction circuit has an offset correction output that is coupled to the bandgap adjustment input. A signal at the offset correction output is trimmed at an ambient temperature. A thermal error cancellation (TEC) circuit has a TEC output coupled to the bandgap adjustment input. The TEC circuit includes first and second temperature sensors that are located apart from each other. A signal at the TEC output is responsive to temperatures at the first and second temperature sensors. An amplifier has an amplifier input and an amplifier output. The amplifier input is coupled to the bandgap reference output.Type: GrantFiled: January 28, 2022Date of Patent: January 16, 2024Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sandeep Shylaja Krishnan, Akshay Yashwant Jadhav, Tallam Vishwanath
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Publication number: 20230101413Abstract: This description relates generally to piecewise temperature compensation. In an example, a circuit includes a knee code selector that can be configured to set a knee point temperature for a correction current responsive to a respective knee point temperature code of knee point temperature codes and a respective temperature sense signal of temperature sense signals. The circuit includes an output circuit that can be configured to provide the correction current responsive to the respective temperature sense signal and temperature voltages, and a trim digital to analog converter (DAC) that can be configured to provide a piecewise compensation current responsive to the correction current and a respective trim code of trim codes.Type: ApplicationFiled: October 29, 2021Publication date: March 30, 2023Inventors: Tallam VISHWANATH, Sandeep Shylaja KRISHNAN
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Publication number: 20220329211Abstract: Described embodiments include an integrated circuit for temperature gradient compensation of a bandgap voltage. A bandgap core circuit has a bandgap feedback input, a bandgap adjustment input and a bandgap reference output. A resistor is coupled between the bandgap adjustment input and a ground terminal. An offset and slope correction circuit has an offset correction output that is coupled to the bandgap adjustment input. A signal at the offset correction output is trimmed at an ambient temperature. A thermal error cancellation (TEC) circuit has a TEC output coupled to the bandgap adjustment input. The TEC circuit includes first and second temperature sensors that are located apart from each other. A signal at the TEC output is responsive to temperatures at the first and second temperature sensors. An amplifier has an amplifier input and an amplifier output. The amplifier input is coupled to the bandgap reference output.Type: ApplicationFiled: January 28, 2022Publication date: October 13, 2022Inventors: Sandeep Shylaja Krishnan, Akshay Yashwant Jadhav, Tallam Vishwanath
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Publication number: 20210349490Abstract: A bandgap reference circuit includes first through fourth bipolar junction transistors (BJTs). The base and collector of the first BJT are shorted together. The second BJT is coupled to the first BJT via a first resistor. The base of the third BJT is coupled to the base of the first BJT. The base and collector of the fourth BJT are coupled together and also are coupled to the base of the second BJT. A second resistor is coupled to the fourth emitter of the fourth BJT. A third resistor is coupled to the second resistor and to the emitter of the second BJT. An operational amplifier has a first input coupled to the first resistor and the collector of the second BJT, a second input coupled to the emitter of the third BJT and the collector of the fourth BJT, and an output coupled to the collectors of the first and third BJTs.Type: ApplicationFiled: May 7, 2021Publication date: November 11, 2021Inventors: Sandeep Shylaja KRISHNAN, Tallam VISHWANATH, Akshay Yashwant JADHAV
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Patent number: 11088699Abstract: An electronic device includes a bandgap reference circuit having an output, and a bias input; a piecewise compensation circuit having an output coupled to the bias input, and an input; and a piecewise compensation current generator having an output coupled to the input of the piecewise compensation circuit, and a knee point temperature adjustment circuit coupled to the output of the piecewise compensation current generator.Type: GrantFiled: June 5, 2020Date of Patent: August 10, 2021Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Tallam Vishwanath, Sandeep Shylaja Krishnan
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Publication number: 20200336141Abstract: A supply voltage supervisor circuit includes a comparator circuit. The comparator circuit includes a first input terminal, a second input terminal, a first transistor, and a second transistor. The first transistor has a first threshold voltage, and includes a first terminal coupled to the first input terminal. The second transistor has a second threshold voltage that is different from the first voltage threshold, and includes a first terminal coupled to the second input terminal, and a second terminal coupled to a second terminal of the first transistor. A trip point of the comparator circuit is based on a difference of the first threshold voltage and the second threshold voltage.Type: ApplicationFiled: April 20, 2020Publication date: October 22, 2020Inventors: Santhosh Kumar S, Divya KAUR, Rajat CHAUHAN, Jayateerth Pandurang MATHAD, Tallam VISHWANATH, Vinod MENEZES