Patents by Inventor RAJENDRAKUMAR JOISH
RAJENDRAKUMAR JOISH 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: 11063562Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input and generates a first load current. A first output node is coupled to a power supply through a first load resistor. The first load resistor receives the first load current. A first capacitor network is coupled to the first output node and draws a first capacitive current from the first output node. A first current buffer is coupled between the first output node and the first transistor. A current through the first current buffer is a summation of the first load current and the first capacitive current.Type: GrantFiled: February 19, 2020Date of Patent: July 13, 2021Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Rajendrakumar Joish
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Publication number: 20200209977Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input and generates a first load current. A first output node is coupled to a power supply through a first load resistor. The first load resistor receives the first load current. A first capacitor network is coupled to the first output node and draws a first capacitive current from the first output node. A first current buffer is coupled between the first output node and the first transistor. A current through the first current buffer is a summation of the first load current and the first capacitive current.Type: ApplicationFiled: February 19, 2020Publication date: July 2, 2020Inventor: Rajendrakumar Joish
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Patent number: 10608602Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input and generates a first load current. A first output node is coupled to a power supply through a first load resistor. The first load resistor receives the first load current. A first capacitor network is coupled to the first output node and draws a first capacitive current from the first output node. A first current buffer is coupled between the first output node and the first transistor. A current through the first current buffer is a summation of the first load current and the first capacitive current.Type: GrantFiled: February 6, 2019Date of Patent: March 31, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Rajendrakumar Joish
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Patent number: 10581406Abstract: A circuit for digital filtering an analog signal converted to digital, including an analog circuit to generate an analog signal, the analog signal including phase and/or gain errors. An analog-to-digital converter (ADC) to convert the analog signal to a digital signal output to a digital signal path. A frequency-dependent corrector filter included in the digital signal path, and configured as a parameterized filter, the parameterized filter configurable based on the DSA control signal with at least one complex filter parameter for each DSA attenuation step, to correct frequency-dependent errors in phase and/or gain.Type: GrantFiled: June 11, 2018Date of Patent: March 3, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Jawaharlal Tangudu, Karthik Khanna S, Chandrasekhar Sriram, Rajendrakumar Joish, Viswanathan Nagarajan
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Patent number: 10483945Abstract: The disclosure provides an RF receiver. The RF receiver includes an input driver. The input driver receives a coarse signal, and generates an input signal. A digital step attenuator (DSA) is coupled to the input driver and receives the input signal. An analog to digital converter (ADC) is coupled to the DSA. The DSA includes a serial capacitor coupled to the input driver. The DSA also includes a sampling capacitor coupled to the ADC.Type: GrantFiled: December 22, 2017Date of Patent: November 19, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Rajendrakumar Joish, Visvesvaraya Pentakota
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Patent number: 10476542Abstract: A digital step attenuator (DSA) includes a switch control circuit which receives the attenuated signal output by the DSA from a buffer and generates a tracked control signal for switches within the DSA. Some switch control circuits include a capacitor coupled to receive the buffered signal, a supply voltage, and a switch control logic sub-circuit for each switch. Each switch control logic sub-circuit receives a control signal, for either the gate or the bulk terminal of the switch, and generates the tracked control signal. In other embodiments, switch control circuits include a complementary MOSFET switching device coupled to receive a control signal, and a capacitor coupled to receive the buffered signal, both of which are connected to an output terminal for the tracked control signal. In those embodiments, the DSA includes a switch control circuit for each switch connected to the DSA output.Type: GrantFiled: February 13, 2019Date of Patent: November 12, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Neeraj Shrivastava, Rajendrakumar Joish, Shagun Dusad, Visvesvaraya Pentakota
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Patent number: 10419010Abstract: Pipelined analog-to-digital converters (ADCs) include a flash ADC that reduces noise tones in power supply current drawn by the flash ADC. A pipelined analog-to-digital converter (ADC) includes a flash ADC and error correction circuitry coupled to the flash ADC. The flash ADC includes a plurality of latched comparators and a plurality of driver circuits. Each of the latched comparators includes an inverting output and a non-inverting output. Each of the driver circuits is coupled to one of the latched comparators, and includes an input terminal and an output terminal. In a first subset of the driver circuits the input terminal is coupled to the inverting output of one of the latched comparators. In a second subset of the driver circuits the input terminal is coupled to the non-inverting output of one of the latched comparators.Type: GrantFiled: December 12, 2018Date of Patent: September 17, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Rajendrakumar Joish, Himanshu Varshney
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Patent number: 10340966Abstract: The disclosure provides an RF receiver. The RF receiver includes an input driver. The input driver receives a coarse signal, and generates an input signal. A digital step attenuator (DSA) is coupled to the input driver and receives the input signal. An analog to digital converter (ADC) is coupled to the DSA. The DSA includes a sampling capacitor coupled to the ADC. The DSA also includes a time dependent resistor coupled to a source voltage and to the sampling capacitor.Type: GrantFiled: December 27, 2017Date of Patent: July 2, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Rajendrakumar Joish
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Publication number: 20190173437Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input and generates a first load current. A first output node is coupled to a power supply through a first load resistor. The first load resistor receives the first load current. A first capacitor network is coupled to the first output node and draws a first capacitive current from the first output node. A first current buffer is coupled between the first output node and the first transistor. A current through the first current buffer is a summation of the first load current and the first capacitive current.Type: ApplicationFiled: February 6, 2019Publication date: June 6, 2019Inventor: Rajendrakumar Joish
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Patent number: 10263575Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input and generates a first load current. A first output node is coupled to a power supply through a first load resistor. The first load resistor receives the first load current. A first capacitor network is coupled to the first output node and draws a first capacitive current from the first output node. A first current buffer is coupled between the first output node and the first transistor. A current through the first current buffer is a summation of the first load current and the first capacitive current.Type: GrantFiled: November 28, 2017Date of Patent: April 16, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Rajendrakumar Joish
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Publication number: 20190013795Abstract: A circuit for digital filtering an analog signal converted to digital, including an analog circuit to generate an analog signal, the analog signal including phase and/or gain errors. An analog-to-digital converter (ADC) to convert the analog signal to a digital signal output to a digital signal path. A frequency-dependent corrector filter included in the digital signal path, and configured as a parameterized filter, the parameterized filter configurable based on the DSA control signal with at least one complex filter parameter for each DSA attenuation step, to correct frequency-dependent errors in phase and/or gain.Type: ApplicationFiled: June 11, 2018Publication date: January 10, 2019Inventors: Jawaharlal Tangudu, KARTHIK KHANNA S, Chandrasekhar Sriram, Rajendrakumar Joish, Viswanathan Nagarajan
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Patent number: 10033341Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input. A second transistor receives a second input. A plurality of impedance networks is coupled between the first transistor and the second transistor. At least one impedance network of the plurality of impedance networks includes a first impedance path and a second impedance path. The first impedance path is activated during single ended operation, and the second impedance path is activated during differential operation.Type: GrantFiled: March 20, 2017Date of Patent: July 24, 2018Assignee: TEXAS INSTRUMENTS INCORPORATIONInventor: Rajendrakumar Joish
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Publication number: 20180183409Abstract: The disclosure provides an RF receiver. The RF receiver includes an input driver. The input driver receives a coarse signal, and generates an input signal. A digital step attenuator (DSA) is coupled to the input driver and receives the input signal. An analog to digital converter (ADC) is coupled to the DSA. The DSA includes a serial capacitor coupled to the input driver. The DSA also includes a sampling capacitor coupled to the ADC.Type: ApplicationFiled: December 22, 2017Publication date: June 28, 2018Inventors: Rajendrakumar Joish, Visvesvaraya Pentakota
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Publication number: 20180183475Abstract: The disclosure provides an RF receiver. The RF receiver includes an input driver. The input driver receives a coarse signal, and generates an input signal. A digital step attenuator (DSA) is coupled to the input driver and receives the input signal. An analog to digital converter (ADC) is coupled to the DSA. The DSA includes a sampling capacitor coupled to the ADC. The DSA also includes a time dependent resistor coupled to a source voltage and to the sampling capacitor.Type: ApplicationFiled: December 27, 2017Publication date: June 28, 2018Inventor: Rajendrakumar Joish
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Publication number: 20180083580Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input and generates a first load current. A first output node is coupled to a power supply through a first load resistor. The first load resistor receives the first load current. A first capacitor network is coupled to the first output node and draws a first capacitive current from the first output node. A first current buffer is coupled between the first output node and the first transistor. A current through the first current buffer is a summation of the first load current and the first capacitive current.Type: ApplicationFiled: November 28, 2017Publication date: March 22, 2018Inventor: Rajendrakumar Joish
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Patent number: 9847760Abstract: The disclosure provides a circuit. The circuit includes a gain stage block. The gain stage block is coupled to an input voltage through a first switch. A first capacitor is coupled between the first switch and a ground terminal. A second capacitor is coupled between the first switch and a second switch. A third switch is coupled between the second capacitor and a fixed terminal of the gain stage block.Type: GrantFiled: June 12, 2017Date of Patent: December 19, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Shagun Dusad, Rajendrakumar Joish
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Publication number: 20170359035Abstract: The disclosure provides a circuit. The circuit includes a gain stage block. The gain stage block is coupled to an input voltage through a first switch. A first capacitor is coupled between the first switch and a ground terminal. A second capacitor is coupled between the first switch and a second switch. A third switch is coupled between the second capacitor and a fixed terminal of the gain stage block.Type: ApplicationFiled: June 12, 2017Publication date: December 14, 2017Inventors: Shagun DUSAD, Rajendrakumar JOISH
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Patent number: 9813040Abstract: A programmable (multistep) resistor attenuator architecture (such as for input to a differential amplifier) provides cancellation for harmonic distortion currents. An attenuation node is coupled: (a) to an input node through R; (b) to a virtual ground through kR and a virtual ground switch Swf with on-resistance Rswf; and (c) to a differential ground through mR and a differential ground switch Swp with on-resistance Rswp. Swp can be sized relative to Swf such that a component Ipnf of Ipn through Rswp and mR to the attenuation node, and branching into kR and Rswf, matches (phase/magnitude), a harmonic current Ifn from the virtual ground through Rswf and kR to the attenuation node. Harmonic distortion cancelation at the virtual ground can be based on matching switches Swf and Swp and the resistors R, mR, kR, reducing sensitivity to PVT variations, input frequency and amplitude. The attenuator architecture is extendable to multistage configurations.Type: GrantFiled: September 17, 2015Date of Patent: November 7, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Rajendrakumar Joish
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Publication number: 20170194923Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input. A second transistor receives a second input. A plurality of impedance networks is coupled between the first transistor and the second transistor. At least one impedance network of the plurality of impedance networks includes a first impedance path and a second impedance path. The first impedance path is activated during single ended operation, and the second impedance path is activated during differential operation.Type: ApplicationFiled: March 20, 2017Publication date: July 6, 2017Inventor: Rajendrakumar Joish
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Patent number: 9602069Abstract: The disclosure provides an amplifier. The amplifier includes a first transistor that receives a first input. A second transistor receives a second input. A plurality of impedance networks is coupled between the first transistor and the second transistor. At least one impedance network of the plurality of impedance networks includes a first impedance path and a second impedance path. The first impedance path is activated during single ended operation, and the second impedance path is activated during differential operation.Type: GrantFiled: September 1, 2016Date of Patent: March 21, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Rajendrakumar Joish