Patents by Inventor Koushik Krishnan
Koushik Krishnan 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: 9742415Abstract: A charge pump and a differential phase locked loop incorporating the charge pump. The charge pump includes a differential charge pump and an auxiliary charge pump. The differential charge pump has differential inputs and primary and mirror outputs. The differential charge pump is responsive to a down signal at the differential inputs to provide a negative current at the primary output and a positive current at the mirror output, and further responsive to an up signal at the differential inputs to provide a positive current at the primary output and a negative current at the mirror output. The auxiliary charge pump has differential inputs and an auxiliary output coupled to the mirror output of the differential charge pump. The differential charge pump is responsive to the down signal at the differential inputs to provide a negative current at the auxiliary output, and responsive to the up signal at the differential inputs to provide a positive current at the auxiliary output.Type: GrantFiled: September 30, 2016Date of Patent: August 22, 2017Assignee: Quantenna Communications, Inc.Inventors: Shirin Chegeni, Koushik Krishnan
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Patent number: 9124302Abstract: A near-field communications (NFC) device includes an NFC antenna, a matching network coupled to the NFC antenna, and a transmitter coupled to the matching network. The transmitter applies a signal to the matching network and varies a frequency of the signal. A parameter is measured while varying the frequency of the signal. A peak value of the parameter is identified and compared to a threshold. A communication protocol is initiated in response to a determination that the peak value satisfies the threshold.Type: GrantFiled: October 11, 2012Date of Patent: September 1, 2015Assignee: QUALCOMM IncorporatedInventors: Koushik Krishnan, Rainer Gaethke, Faramarz Sabouri
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Patent number: 9071926Abstract: First and second NFC devices both seek to determine whether the other device is present and available for communication across an NFC channel. The first NFC device modulates a load in its transceiver. The second NFC device transmits a waveform. If the first NFC device detects the waveform while modulating its load, and if the second NFC device detects the load modulation while transmitting the waveform, then the two NFC devices initiate communication in accordance with a communication protocol.Type: GrantFiled: October 22, 2012Date of Patent: June 30, 2015Assignee: QUALCOMM IncorporatedInventors: Koushik Krishnan, Rainer Gaethke
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Patent number: 8977197Abstract: A near-field communications (NFC) device includes an NFC antenna, a matching network coupled to the NFC antenna, and a transmitter coupled to the matching network. The transmitter applies a signal to the matching network and a capacitance of the matching network is varied. A parameter is measured while varying the capacitance of the matching network and while applying the signal. A peak value of the parameter is identified and compared to a threshold. A communication protocol is initiated in response to a determination that the peak value satisfies the threshold.Type: GrantFiled: October 11, 2012Date of Patent: March 10, 2015Assignee: QUALCOMM IncorporatedInventors: Koushik Krishnan, Rainer Gaethke, Faramarz Sabouri
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Publication number: 20140113551Abstract: First and second NFC devices both seek to determine whether the other device is present and available for communication across an NFC channel. The first NFC device modulates a load in its transceiver. The second NFC device transmits a waveform. If the first NFC device detects the waveform while modulating its load, and if the second NFC device detects the load modulation while transmitting the waveform, then the two NFC devices initiate communication in accordance with a communication protocol.Type: ApplicationFiled: October 22, 2012Publication date: April 24, 2014Applicant: Qualcomm IncorporatedInventors: Koushik KRISHNAN, Rainer Gaethke
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Publication number: 20140106669Abstract: A near-field communications (NFC) device includes an NFC antenna, a matching network coupled to the NFC antenna, and a transmitter coupled to the matching network. The transmitter applies a signal to the matching network and varies a frequency of the signal. A parameter is measured while varying the frequency of the signal. A peak value of the parameter is identified and compared to a threshold. A communication protocol is initiated in response to a determination that the peak value satisfies the threshold.Type: ApplicationFiled: October 11, 2012Publication date: April 17, 2014Applicant: Qualcomm IncorporatedInventors: Koushik KRISHNAN, Rainer Gaethke, Faramarz Sabouri
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Publication number: 20140106668Abstract: A near-field communications (NFC) device includes an NFC antenna, a matching network coupled to the NFC antenna, and a transmitter coupled to the matching network. The transmitter applies a signal to the matching network and a capacitance of the matching network is varied. A parameter is measured while varying the capacitance of the matching network and while applying the signal. A peak value of the parameter is identified and compared to a threshold. A communication protocol is initiated in response to a determination that the peak value satisfies the threshold.Type: ApplicationFiled: October 11, 2012Publication date: April 17, 2014Applicant: Qualcomm IncorporatedInventors: Koushik KRISHNAN, Rainer GAETHKE, Faramarz SABOURI
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Patent number: 8552787Abstract: Methods and apparatus for a gray-coded phase rotating frequency divider. A phase selector is provided that includes two or more selectors, each selector configured to receive multiple clock phases and output a respective clock phase based on one or more selection bits that are part of a selection input, and a gray code generator configured to generate a gray coded output that forms the selection input so that when the gray coded output changes state only selection bits associated with a single selector change. A method includes grouping a plurality of clock phases into two or more groups, for each group, selecting a respective clock phase based on one or more selection bits that are part of a selection input, and generating a gray coded output that forms the selection input so that when the gray coded output changes state only selection bits associated with a single group change.Type: GrantFiled: June 10, 2010Date of Patent: October 8, 2013Assignee: QUALCOMM IncorporatedInventors: Koushik Krishnan, Jafar Savoj
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Publication number: 20110304374Abstract: Methods and apparatus for a gray-coded phase rotating frequency divider. A phase selector is provided that includes two or more selectors, each selector configured to receive multiple clock phases and output a respective clock phase based on one or more selection bits that are part of a selection input, and a gray code generator configured to generate a gray coded output that forms the selection input so that when the gray coded output changes state only selection bits associated with a single selector change. A method includes grouping a plurality of clock phases into two or more groups, for each group, selecting a respective clock phase based on one or more selection bits that are part of a selection input, and generating a gray coded output that forms the selection input so that when the gray coded output changes state only selection bits associated with a single group change.Type: ApplicationFiled: June 10, 2010Publication date: December 15, 2011Applicant: QUALCOMM INCORPORATEDInventors: Koushik Krishnan, Jafar Savoj
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Patent number: 7999625Abstract: A method of calibrating oscillators is disclosed that includes searching, in an array storing an operational characteristic of the oscillator, for an index value that is associated with an output of the oscillator; determining that the output is within a predetermined accuracy as compared to a desired output; and generating the output based the index value. An apparatus for performing the method is also disclosed herein.Type: GrantFiled: September 18, 2009Date of Patent: August 16, 2011Assignee: QUALCOMM, IncorporatedInventor: Koushik Krishnan
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Publication number: 20110068874Abstract: A method of calibrating oscillators is disclosed that includes searching, in an array storing an operational characteristic of the oscillator, for an index value that is associated with an output of the oscillator; determining that the output is within a predetermined accuracy as compared to a desired output; and generating the output based the index value. An apparatus for performing the method is also disclosed herein.Type: ApplicationFiled: September 18, 2009Publication date: March 24, 2011Applicant: QUALCOMM IncorporatedInventor: Koushik Krishnan
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Patent number: 7352251Abstract: Various systems and methods for clock management. As one example, a system for clock management is disclosed that includes a controllable oscillator, an oscillation control source, and a sample and hold circuit. The sample and hold circuit is disposed between the oscillation control source and the controllable oscillator, and is operable to introduce a transfer function having a sin x/x characteristic with a null at a switch frequency applied to the sample and hold circuit.Type: GrantFiled: March 2, 2006Date of Patent: April 1, 2008Assignee: Texas Instruments IncorporatedInventors: Koushik Krishnan, Prasun Kali Battacharya
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Publication number: 20070216489Abstract: Various systems and methods for clock management. As one example, a system for clock management is disclosed that includes a controllable oscillator, an oscillation control source, and a sample and hold circuit. The sample and hold circuit is disposed between the oscillation control source and the controllable oscillator, and is operable to introduce a transfer function having a sin x/x characteristic with a null at a switch frequency applied to the sample and hold circuit.Type: ApplicationFiled: March 2, 2006Publication date: September 20, 2007Applicant: Texas Instruments IncorporatedInventors: Koushik Krishnan, Prasun Kali Battacharya
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Publication number: 20060071721Abstract: An active filter circuit containing small capacitors. Due to the presence of such small capacitors, components such as PLL can potentially be integrated into integrated circuits. In an embodiment, the filter circuit is implemented by having a combination of a first capacitor and a first resistor connected in series providing the input signal to the input terminal of a operational amplifier, and a second resistor being connected in parallel to the combination. A second capacitor may be connected between the input and output terminals of the operational amplifier. The first capacitor may be chosen to be small by choosing the second resistor to be of a large resistance. Any noise introduced by such a large resistor may be attenuated by choosing the first resistor to be small.Type: ApplicationFiled: October 1, 2004Publication date: April 6, 2006Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Prakash EASWARAN, Koushik KRISHNAN