Patents by Inventor Abhijit Kumar Das
Abhijit Kumar Das 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).
-
Publication number: 20190369148Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, a noise measurement circuit configured to measure electrical noise on the node, and the controller receiving the measurement of noise from the noise measurement circuit.Type: ApplicationFiled: August 14, 2019Publication date: December 5, 2019Inventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das
-
Patent number: 10491228Abstract: An electronic circuit system with an input for receiving an analog signal having a frequency and comprising noise, that noise including input referred noise, and the noise fluctuates in a range. The system also comprises a signal path with: (i) an analog to digital converter for providing a digital output value in response to a clock period; (ii) a feedback node; and (iii) circuitry for limiting a signal swing at the feedback node, during a period of the clock period, to be no greater than an RMS value of the noise. The analog to digital converter is further for providing the digital output value in response to the analog signal and the signal swing at the feedback node.Type: GrantFiled: August 31, 2017Date of Patent: November 26, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Abhijit Kumar Das, Brian Roger Elies
-
Patent number: 10466286Abstract: A system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, and the controller causing the time period for capacitance measurements to vary even when the capacitance is constant.Type: GrantFiled: December 18, 2017Date of Patent: November 5, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das
-
Patent number: 10422822Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, a noise measurement circuit configured to measure electrical noise on the node, and the controller receiving the measurement of noise from the noise measurement circuit.Type: GrantFiled: July 30, 2018Date of Patent: September 24, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das
-
Patent number: 10330767Abstract: A calibrated measurement circuit, with a first node, a second node, a circuit element coupled between the first node and the second node, and a reference circuit element. The calibrated measurement circuit also comprises circuitry for directing a first current and a second current between the first node and the second node and to the reference circuit element. The calibrated measurement circuit also comprises circuitry for measuring voltage across the circuit element in response to the first and second currents, and circuitry for measuring voltage across the reference circuit element in response to the first and second currents. A calibration factor is also determined for calibrating measured voltages across the circuit element, in response to a relationship between the first voltage, the second voltage, and the reference circuit element.Type: GrantFiled: November 25, 2015Date of Patent: June 25, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Abhijit Kumar Das, Christy Lee She
-
Publication number: 20180335459Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, a noise measurement circuit configured to measure electrical noise on the node, and the controller receiving the measurement of noise from the noise measurement circuit.Type: ApplicationFiled: July 30, 2018Publication date: November 22, 2018Inventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das
-
Patent number: 10060959Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, a noise measurement circuit configured to measure electrical noise on the node, and the controller receiving the measurement of noise from the noise measurement circuit.Type: GrantFiled: February 25, 2014Date of Patent: August 28, 2018Assignee: Texas Instruments IncorporatedInventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das
-
Publication number: 20180123607Abstract: An electronic circuit system with an input for receiving an analog signal having a frequency and comprising noise, that noise including input referred noise, and the noise fluctuates in a range. The system also comprises a signal path with: (i) an analog to digital converter for providing a digital output value in response to a clock period; (ii) a feedback node; and (iii) circuitry for limiting a signal swing at the feedback node, during a period of the clock period, to be no greater than an RMS value of the noise. The analog to digital converter is further for providing the digital output value in response to the analog signal and the signal swing at the feedback node.Type: ApplicationFiled: August 31, 2017Publication date: May 3, 2018Inventors: Abhijit Kumar Das, Brian Roger Elies
-
Publication number: 20180106844Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, and the controller causing the time period for capacitance measurements to vary even when the capacitance is constant.Type: ApplicationFiled: December 18, 2017Publication date: April 19, 2018Inventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das
-
Publication number: 20180054204Abstract: A system, method and apparatus for tuning an internal oscillator to a desired frequency F1 is shown and uses an RC delay element that comprises a resistor, a capacitor and a comparator. The method includes receiving a clock signal from an oscillator to be tuned, triggering charging of the RC delay element, and N clock cycles after triggering the charging, the method determines whether the charge on the precision RC delay element is higher than or lower than a reference voltage. Correction to the clock frequency is based on the results.Type: ApplicationFiled: October 12, 2017Publication date: February 22, 2018Inventor: Abhijit Kumar Das
-
Patent number: 9846185Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, and the controller causing the time period for capacitance measurements to vary even when the capacitance is constant.Type: GrantFiled: February 25, 2014Date of Patent: December 19, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das
-
Patent number: 9825637Abstract: A system, method and apparatus for tuning an internal oscillator to a desired frequency F1 is shown and uses an RC delay element that comprises a resistor, a capacitor and a comparator. The method includes receiving a clock signal from an oscillator to be tuned, triggering charging of the RC delay element, and N clock cycles after triggering the charging, the method determines whether the charge on the precision RC delay element is higher than or lower than a reference voltage. Correction to the clock frequency is based on the results.Type: GrantFiled: October 18, 2016Date of Patent: November 21, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Abhijit Kumar Das
-
Patent number: 9780798Abstract: An electronic circuit system with an input for receiving an analog signal having a frequency and comprising noise, that noise including input referred noise, and the noise fluctuates in a range. The system also comprises a signal path with: (i) an analog to digital converter for providing a digital output value in response to a clock period; (ii) a feedback node; and (iii) circuitry for limiting a signal swing at the feedback node, during a period of the clock period, to be no greater than an RMS value of the noise. The analog to digital converter is further for providing the digital output value in response to the analog signal and the signal swing at the feedback node.Type: GrantFiled: November 1, 2016Date of Patent: October 3, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Abhijit Kumar Das, Brian Roger Elies
-
Publication number: 20170146633Abstract: A calibrated measurement circuit, with a first node, a second node, a circuit element coupled between the first node and the second node, and a reference circuit element. The calibrated measurement circuit also comprises circuitry for directing a first current and a second current between the first node and the second node and to the reference circuit element. The calibrated measurement circuit also comprises circuitry for measuring voltage across the circuit element in response to the first and second currents, and circuitry for measuring voltage across the reference circuit element in response to the first and second currents. A calibration factor is also determined for calibrating measured voltages across the circuit element, in response to a relationship between the first voltage, the second voltage, and the reference circuit element.Type: ApplicationFiled: November 25, 2015Publication date: May 25, 2017Inventors: Abhijit Kumar Das, Christy Lee She
-
Publication number: 20170126235Abstract: A system, method and apparatus for tuning an internal oscillator to a desired frequency F1 is shown and uses an RC delay element that comprises a resistor, a capacitor and a comparator. The method includes receiving a clock signal from an oscillator to be tuned, triggering charging of the RC delay element, and N clock cycles after triggering the charging, the method determines whether the charge on the precision RC delay element is higher than or lower than a reference voltage. Correction to the clock frequency is based on the results.Type: ApplicationFiled: October 18, 2016Publication date: May 4, 2017Inventor: Abhijit Kumar Das
-
Patent number: 9520881Abstract: A system for tuning an oscillator frequency. The system includes a trimmed calibration circuit comprising a comparator and trimmed delay element and calibration logic. The calibration logic is configured to receive an output of the comparator and control an on time and an off time of an oscillator based on the output of the comparator.Type: GrantFiled: October 30, 2015Date of Patent: December 13, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Abhijit Kumar Das, Krishnasawamy Nagaraj, Rahul Bhandarkar
-
Patent number: 9503100Abstract: A system, method and apparatus for tuning an internal oscillator to a desired frequency F1 is shown and uses an RC delay element that comprises a resistor, a capacitor and a comparator. The method includes receiving a clock signal from an oscillator to be tuned, triggering charging of the RC delay element, and N clock cycles after triggering the charging, the method determines whether the charge on the precision RC delay element is higher than or lower than a reference voltage. Correction to the clock frequency is based on the results.Type: GrantFiled: October 30, 2015Date of Patent: November 22, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Abhijit Kumar Das
-
Publication number: 20140239983Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, and the controller causing the time period for capacitance measurements to vary even when the capacitance is constant.Type: ApplicationFiled: February 25, 2014Publication date: August 28, 2014Applicant: Texas Instruments IncorporatedInventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das
-
Publication number: 20140240153Abstract: A Sigma Delta Modulator (SDM) signal overload conditions are overcome without sacrificing performance or driving up implementation costs. These advanced overload protection method can be applied to any higher order SDM where overloading is a serious system concern.Type: ApplicationFiled: February 28, 2013Publication date: August 28, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventor: Abhijit Kumar Das
-
Publication number: 20140239977Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, a noise measurement circuit configured to measure electrical noise on the node, and the controller receiving the measurement of noise from the noise measurement circuit.Type: ApplicationFiled: February 25, 2014Publication date: August 28, 2014Applicant: Texas Instruments IncorporatedInventors: Krishnasawamy Nagaraj, Paul Kimelman, Abhijit Kumar Das