Patents by Inventor Shyam S Somayajula
Shyam S Somayajula 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: 9392361Abstract: Described herein is a microphone assembly for an electronic device incorporating a microphone. The microphone assembly includes a microphone interface that enables direct coupling of inputs from the microphone to a preamplifier. For the purpose, the microphone interface includes a DC servo loop. The DC servo loop provides a DC path for supplying a DC bias current to the microphone and an AC path to receive the AC output obtained from the microphone. The AC path and the DC path allow separation of the AC output of the microphone from the DC bias current. The microphone interface is implemented using reduced number of IC pin interfaces and external components to achieve compactness of the device.Type: GrantFiled: October 20, 2010Date of Patent: July 12, 2016Assignee: ST-Ericsson SAInventors: Rishi C. Agarwal, Shyam S. Somayajula, Lionel Cimaz
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Patent number: 9025791Abstract: A device implementing a scheme for reduction of pop-up noise is disclosed. The device comprises an audio sub-system (100) having an integrator (112) for amplifying an input signal (133) and a modulation circuit (114) including one or more comparators. The audio subsystem (100) is further provided with a feedback loop (142) across the integrator (112) and the modulation circuit (114) to calibrate an offsets outputs of the integrator (112) and the modulation circuit (114). The feedback loop (142) includes an integrator-offset loop (202) across the integrator (112) to calibrate an offset (136) in the output of the integrator (112), and an offset calibration loop (302) across the modulation circuit (114) to calibrate an offset (140) in the output of the modulation circuit (114).Type: GrantFiled: November 30, 2009Date of Patent: May 5, 2015Assignee: ST-Ericsson SAInventors: Ankit Seedher, Raja J. Prabhu, Shyam S. Somayajula
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Patent number: 8841950Abstract: A device and a method for implementing pulse width modulation for switching amplifiers (120) is described herein. In one embodiment, the device includes a sampling signal generator (202) to generate a sampling signal (208) and a modulation unit (102) operatively coupled to the sampling signal generator (202). The modulation unit (102) generates differential pulse width modulated waveforms based on the sampling signal (208) and differential input signals (220-1 and 220-2) such that at least one differential pulse width modulated waveform has a duty cycle equivalent to a pre-determined non-zero minimum pulse width at all values of the differential input signals (220-1 and 220-2).Type: GrantFiled: October 8, 2010Date of Patent: September 23, 2014Assignee: Ericsson Modems SAInventors: Shyam S. Somayajula, Ankit Seedher, Raja J. Prabhu
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Patent number: 8671286Abstract: In one embodiment, a power supply switching circuit may automatically provide power to a clock circuit from one of an auxiliary power supply and a main power supply, based on a voltage of the main power supply. To provide automatic switching, a switch circuit coupled between the power supplies and the clock circuit may be controlled by a voltage detector, in some embodiments.Type: GrantFiled: March 27, 2008Date of Patent: March 11, 2014Assignee: Silicon Laboratories Inc.Inventors: Wenjung Sheng, Shyam S. Somayajula, Xue-Mei Gong
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Publication number: 20120308052Abstract: Described herein is a microphone assembly for an electronic device incorporating a microphone. The microphone assembly includes a microphone interface that enables direct coupling of inputs from the microphone to a preamplifier. For the purpose, the microphone interface includes a DC servo loop. The DC servo loop provides a DC path for supplying a DC bias current to the microphone and an AC path to receive the AC output obtained from the microphone. The AC path and the DC path allow separation of the AC output of the microphone from the DC bias current. The microphone interface is implemented using reduced number of IC pin interfaces and external components to achieve compactness of the device.Type: ApplicationFiled: October 20, 2010Publication date: December 6, 2012Inventors: Rishi C. Agarwal, Shyam S. Somayajula, Lionel Cimaz
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Publication number: 20120274399Abstract: A device implementing a scheme for reduction of pop-up noise is disclosed. The device comprises an audio sub-system (100) having an integrator (112) for amplifying an input signal (133) and a modulation circuit (114) including one or more comparators. The audio subsystem (100) is further provided with a feedback loop (142) across the integrator (112) and the modulation circuit (114) to calibrate an offsets outputs of the integrator (112) and the modulation circuit (114). The feedback loop (142) includes an integrator-offset loop (202) across the integrator (112) to calibrate an offset (136) in the output of the integrator (112), and an offset calibration loop (302) across the modulation circuit (114) to calibrate an offset (140) in the output of the modulation circuit (114).Type: ApplicationFiled: November 30, 2009Publication date: November 1, 2012Inventors: Ankit Seedher, Raja J. Prabhu, Shyam S. Somayajula
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Patent number: 8129973Abstract: A wireless system includes a radio and a voltage regulator, which provides a supply voltage to the radio. The voltage regulator includes a storage element, at least one switch that is coupled to the storage element and a controller. The controller operates the voltage regulator in a continuous mode of operation, operates the voltage regulator in a discontinuous mode of operation in response to an output current of the voltage regulator decreasing below a predetermined threshold; operates the switch(es) to energize the storage element in response to a detection of whether an output voltage is below a threshold level; operates the switch(es) to halt the energization of the storage element in response to detecting a current in the storage element reaching a predetermined current threshold; operates the switch(es) to energize and de-energize the storage element in the discontinuous mode of operation; and operates the switch(es) to energize the storage element in synchronization with a periodic clock signal.Type: GrantFiled: May 19, 2010Date of Patent: March 6, 2012Assignee: Silicon Laboratories Inc.Inventors: Xiaoyu Xi, Shyam S. Somayajula
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Patent number: 7812583Abstract: A system includes a sampler to sample an input voltage and a switching regulator. The switching regulator is adapted to regulate a switching operation of the regulator in response to the sampling by the sampler.Type: GrantFiled: April 8, 2009Date of Patent: October 12, 2010Assignee: ST-Ericsson SAInventors: Xiaoyu Xi, Shyam S. Somayajula
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Publication number: 20100227576Abstract: A wireless system includes a radio and a voltage regulator, which provides a supply voltage to the radio. The voltage regulator includes a storage element, at least one switch that is coupled to the storage element and a controller. The controller operates the voltage regulator in a continuous mode of operation, operates the voltage regulator in a discontinuous mode of operation in response to an output current of the voltage regulator decreasing below a predetermined threshold; operates the switch(es) to energize the storage element in response to a detection of whether an output voltage is below a threshold level; operates the switch(es) to halt the energization of the storage element in response to detecting a current in the storage element reaching a predetermined current threshold; operates the switch(es) to energize and de-energize the storage element in the discontinuous mode of operation; and operates the switch(es) to energize the storage element in synchronization with a periodic clock signal.Type: ApplicationFiled: May 19, 2010Publication date: September 9, 2010Inventors: Xiaoyu Xi, Shyam S. Somayajula
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Patent number: 7737673Abstract: A technique includes energizing a storage element of a voltage regulator in response to the detection of an output voltage of the voltage regulator falling below a threshold level. The technique includes halting the energization of the storage element in response to the detection of a current in the storage element reaching a predetermined threshold.Type: GrantFiled: September 30, 2005Date of Patent: June 15, 2010Assignee: Silicon Laboratories Inc.Inventors: Xiaoyu Xi, Shyam S. Somayajula
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Publication number: 20090195233Abstract: A system includes a sampler to sample an input voltage and a switching regulator. The switching regulator is adapted to regulate a switching operation of the regulator in response to the sampling by the sampler.Type: ApplicationFiled: April 8, 2009Publication date: August 6, 2009Inventors: Xiaoyu Xi, Shyam S. Somayajula
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Patent number: 7535209Abstract: A system includes a sampler to sample an input voltage and a switching regulator. The switching regulator is adapted to regulate a switching operation of the regulator in response to the sampling by the sampler.Type: GrantFiled: September 30, 2005Date of Patent: May 19, 2009Assignee: ST-Ericsson SAInventors: Xiaoyu Xi, Shyam S. Somayajula
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Patent number: 7424275Abstract: A system includes a digital circuit that may be clocked by a digital clock signal having an associated clock period. The system also includes a sample clock generation circuit coupled to a sampling circuit. The sample clock generation circuit may be configured to receive an input clock having a fixed phase relationship with respect to the digital clock signal. The sample clock generation circuit may also generate a sample clock having a first sampling edge corresponding to a first relative offset within the clock period and a subsequent sampling edge corresponding to a different relative offset within the clock period. The sampling circuit may be configured to sample a designated signal upon a first sampling instance corresponding to the first sampling edge and to sample the designated signal upon a subsequent sampling instance corresponding to the subsequent sampling edge.Type: GrantFiled: April 23, 2007Date of Patent: September 9, 2008Assignee: Silicon Laboratories, Inc.Inventor: Shyam S. Somayajula
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Publication number: 20080189565Abstract: In one embodiment, a power supply switching circuit may automatically provide power to a clock circuit from one of an auxiliary power supply and a main power supply, based on a voltage of the main power supply. To provide automatic switching, a switch circuit coupled between the power supplies and the clock circuit may be controlled by a voltage detector, in some embodiments.Type: ApplicationFiled: March 27, 2008Publication date: August 7, 2008Inventors: Wenjung Sheng, Shyam S. Somayajula, Xue-Mei Gong
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Patent number: 7400206Abstract: In one embodiment, the present invention includes methods and apparatus for providing initial control values to programmable load capacitors of an oscillator, such as that of a real time clock circuit. Using the initial values, the real time clock circuit may begin operation, enabling additional circuitry within an integrated circuit to begin operation. This additional circuitry may cause operating values to program the load capacitors to provide a desired reference clock based on a given system's requirements.Type: GrantFiled: March 24, 2005Date of Patent: July 15, 2008Assignee: Silicon Laboratories Inc.Inventors: Wenjung Sheng, Shyam S. Somayajula, Xue-Mei Gong
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Patent number: 7370214Abstract: In one embodiment, a power supply switching circuit may automatically provide power to a clock circuit from one of an auxiliary power supply and a main power supply, based on a voltage of the main power supply. To provide automatic switching, a switch circuit coupled between the power supplies and the clock circuit may be controlled by a voltage detector, in some embodiments.Type: GrantFiled: March 24, 2005Date of Patent: May 6, 2008Assignee: Silicon Laboratories Inc.Inventors: Wenjung Sheng, Shyam S. Somayajula, Xue-Mei Gong
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Patent number: 7330739Abstract: A wireless communication device is disclosed that provides a sidetone to the device user. The device converts an outbound analog audio signal to an outbound audio bitstream from which a sidetone bitstream is extracted. The device also converts an inbound digital audio signal to an inbound audio bitstream. A filter in the device both adds the sidetone bitstream to the inbound audio bitstream and filters the resultant added bitstreams to provide an analog audio signal with sidetone.Type: GrantFiled: March 31, 2005Date of Patent: February 12, 2008Assignee: NXP B.V.Inventor: Shyam S. Somayajula
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Patent number: 7224299Abstract: A delta sigma modulator is provided. The delta sigma modulator comprises quantitizer circuitry configured to generate a digital signal using a first analog signal and dither control circuitry configured to use the digital signal to adjust an amount of dither applied to the first analog signal.Type: GrantFiled: September 30, 2005Date of Patent: May 29, 2007Assignee: NXP, B.V.Inventor: Shyam S. Somayajula
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Patent number: 7209061Abstract: A system includes a digital circuit that may be clocked by a digital clock signal having an associated clock period. The system also includes a sample clock generation circuit coupled to a sampling circuit. The sample clock generation circuit may be configured to receive an input clock having a fixed phase relationship with respect to the digital clock signal. The sample clock generation circuit may also generate a sample clock having a first sampling edge corresponding to a first relative offset within the clock period and a subsequent sampling edge corresponding to a different relative offset within the clock period. The sampling circuit may be configured to sample a designated signal upon a first sampling instance corresponding to the first sampling edge and to sample the designated signal upon a subsequent sampling instance corresponding to the subsequent sampling edge.Type: GrantFiled: March 30, 2005Date of Patent: April 24, 2007Assignee: Silicon Laboratories, Inc.Inventor: Shyam S. Somayajula
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Patent number: 6603415Abstract: Metastable compensation circuitry 700 for detecting and compensating for metastable states of a regenerative latch 209 in a charge redistribution analog to digital converter 201. First and second latches 701a,b each having a selected threshold voltage for monitor corresponding first and second outputs of regenerative latch 209. Detection logic 202a,b 703 detects a selected output state of the first and second latches corresponding to a metastable state of regenerative latch 209. Suppression logic 703 generates an output of a selected logic level in response to the detection of a metastable state by detection logic 702/703.Type: GrantFiled: July 30, 2001Date of Patent: August 5, 2003Assignee: Cirrus Logic, Inc.Inventor: Shyam S Somayajula