Patents by Inventor Laxmi Vivek TRIPURARI
Laxmi Vivek TRIPURARI 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: 11527999Abstract: A circuit includes first and second gain stages and an output transistor. The second gain stage includes a transconductance amplifier and a variable impedance circuit coupled to an output of the transconductance amplifier. The variable impedance circuit is configured to implement a first impedance level at frequencies below a first frequency threshold and to implement a second impedance level at frequencies above a second frequency level. The first impedance level is larger than the second impedance level. The output transistor has a control input coupled to the variable impedance circuit. At frequencies above the second frequency threshold, the second impedance level is configured to be inversely related to current through the output transistor.Type: GrantFiled: September 21, 2020Date of Patent: December 13, 2022Assignee: Texas Instruments IncorporatedInventors: Sovan Ghosh, Amal Kumar Kundu, Laxmi Vivek Tripurari, Anand Subramanian
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Patent number: 11349492Abstract: An analog-to-digital converter (ADC) circuit includes a signal input terminal, a sample-and-hold circuit, and a successive approximation register (SAR) ADC. The sample-and-hold circuit includes an input terminal coupled to the signal input terminal. The SAR ADC includes a comparator, a first capacitive digital-to-analog converter (CDAC), and a second CDAC. The first CDAC includes a first input terminal coupled to the signal input terminal, a second input terminal coupled to an output terminal of the sample-and-hold circuit, and an output terminal coupled to a first input terminal of the comparator. The second CDAC includes a first input terminal coupled to the signal input terminal, an output terminal coupled to a second input terminal of the comparator.Type: GrantFiled: December 4, 2020Date of Patent: May 31, 2022Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sovan Ghosh, Minkle Eldho Paul, Laxmi Vivek Tripurari, Amal Kumar Kundu
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Publication number: 20210119638Abstract: An analog-to-digital converter (ADC) circuit includes a signal input terminal, a sample-and-hold circuit, and a successive approximation register (SAR) ADC. The sample-and-hold circuit includes an input terminal coupled to the signal input terminal. The SAR ADC includes a comparator, a first capacitive digital-to-analog converter (CDAC), and a second CDAC. The first CDAC includes a first input terminal coupled to the signal input terminal, a second input terminal coupled to an output terminal of the sample-and-hold circuit, and an output terminal coupled to a first input terminal of the comparator. The second CDAC includes a first input terminal coupled to the signal input terminal, an output terminal coupled to a second input terminal of the comparator.Type: ApplicationFiled: December 4, 2020Publication date: April 22, 2021Inventors: Sovan GHOSH, Minkle Eldho PAUL, Laxmi Vivek TRIPURARI, Amal KUMAR KUNDU
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Publication number: 20210006211Abstract: A circuit includes first and second gain stages and an output transistor. The second gain stage includes a transconductance amplifier and a variable impedance circuit coupled to an output of the transconductance amplifier. The variable impedance circuit is configured to implement a first impedance level at frequencies below a first frequency threshold and to implement a second impedance level at frequencies above a second frequency level. The first impedance level is larger than the second impedance level. The output transistor has a control input coupled to the variable impedance circuit. At frequencies above the second frequency threshold, the second impedance level is configured to be inversely related to current through the output transistor.Type: ApplicationFiled: September 21, 2020Publication date: January 7, 2021Inventors: Sovan GHOSH, Amal KUMAR KUNDU, Laxmi Vivek TRIPURARI, Anand SUBRAMANIAN
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Patent number: 10886933Abstract: An analog-to-digital converter (ADC) circuit includes a signal input terminal, a sample-and-hold circuit, and a successive approximation register (SAR) ADC. The sample-and-hold circuit includes an input terminal coupled to the signal input terminal. The SAR ADC includes a comparator, a first capacitive digital-to-analog converter (CDAC), and a second CDAC. The first CDAC includes a first input terminal coupled to the signal input terminal, a second input terminal coupled to an output terminal of the sample-and-hold circuit, and an output terminal coupled to a first input terminal of the comparator. The second CDAC includes a first input terminal coupled to the signal input terminal, an output terminal coupled to a second input terminal of the comparator.Type: GrantFiled: October 18, 2019Date of Patent: January 5, 2021Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sovan Ghosh, Minkle Eldho Paul, Laxmi Vivek Tripurari, Amal Kumar Kundu
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Patent number: 10868558Abstract: An analog-to-digital converter (ADC) includes a capacitive digital-to-analog converter (CDAC), a comparator coupled to the CDAC, and a successive approximation register (SAR) control circuit coupled to the CDAC and the comparator. The SAR control circuit is configured to successively select bits of a digital output value. The SAR control circuit is also configured to, after selection of the bits of the digital output value: maintain a state of first switches of the CDAC applied to select a most significant bit of the digital output value, and revert second switches of the CDAC applied to select bits of the digital output value having significance lower than the most significant bit to a state of the second switches prior to selection of the most significant bit.Type: GrantFiled: December 13, 2019Date of Patent: December 15, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Laxmi Vivek Tripurari, Sovan Ghosh, Minkle Eldho Paul
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Patent number: 10819294Abstract: A circuit includes first and second gain stages and an output transistor. The second gain stage includes a transconductance amplifier and a variable impedance circuit coupled to an output of the transconductance amplifier. The variable impedance circuit is configured to implement a first impedance level at frequencies below a first frequency threshold and to implement a second impedance level at frequencies above a second frequency level. The first impedance level is larger than the second impedance level. The output transistor has a control input coupled to the variable impedance circuit. At frequencies above the second frequency threshold, the second impedance level is configured to be inversely related to current through the output transistor.Type: GrantFiled: September 18, 2019Date of Patent: October 27, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sovan Ghosh, Amal Kumar Kundu, Laxmi Vivek Tripurari, Anand Subramanian
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Publication number: 20200336118Abstract: A circuit includes first and second gain stages and an output transistor. The second gain stage includes a transconductance amplifier and a variable impedance circuit coupled to an output of the transconductance amplifier. The variable impedance circuit is configured to implement a first impedance level at frequencies below a first frequency threshold and to implement a second impedance level at frequencies above a second frequency level. The first impedance level is larger than the second impedance level. The output transistor has a control input coupled to the variable impedance circuit. At frequencies above the second frequency threshold, the second impedance level is configured to be inversely related to current through the output transistor.Type: ApplicationFiled: September 18, 2019Publication date: October 22, 2020Inventors: Sovan GHOSH, Amal KUMAR KUNDU, Laxmi Vivek TRIPURARI, Anand SUBRAMANIAN