Patents by Inventor Srinivasan Chakravarthy
Srinivasan Chakravarthy 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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Publication number: 20200211447Abstract: Methods and systems for operating a display panel in a multi-panel display system are presented. In one or more embodiments, a display panel may receive data and power; at a power supply, the display panel may generate a supply voltage from the received power for powering the display panel; and the display panel may forward the received data to an adjacent display panel if or when the power supply fails to generate the supply voltage.Type: ApplicationFiled: September 9, 2019Publication date: July 2, 2020Inventors: Chris Mays, Srinivasan Chakravarthi
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Patent number: 9048180Abstract: A low stress sacrificial cap layer 120 having a silicon oxide liner film 130, a low stress silicon film 140, and a silicon nitride film Alternatively, a low stress sacrificial cap layer 410 having a silicon oxide liner film 130 and a graded silicon nitride film 420. Also, methods 300, 500 for fabricating a transistor 20, 400 having a low stress sacrificial cap layer 120, 410.Type: GrantFiled: May 16, 2006Date of Patent: June 2, 2015Assignee: Texas Instruments IncorporatedInventors: Jiong-Ping Lu, Periannan Chidambaram, Srinivasan Chakravarthi
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Capacitor based digital to analog converter layout design for high speed analog to digital converter
Patent number: 8149152Abstract: A method and system for capacitor based digital to analog converter design layout for high speed analog to digital converter are provided. The method includes arranging a plurality of metal plates to form the capacitor. Each of the plurality of metal plates includes a driven plate and a common plate. The method also includes generating a plurality of interconnects in the common plate and extending the driven plate over the plurality of interconnects. Further, the method includes shielding the common plate by the driven plate. The system includes an analog to digital converter. The analog to digital converter also includes capacitor based digital to analog converter and digital logic for controlling digital operations in the analog to digital converter. The capacitor based digital to analog converter includes a plurality of capacitors, and a comparator for comparing the analog output from the digital to analog converter with a ground potential.Type: GrantFiled: March 23, 2010Date of Patent: April 3, 2012Assignee: Cosmic Circuits Private LimitedInventors: Venkatesh Teeka Srinivasa Shetty, Govind Kulkarni, Srinivasan Chakravarthy, Sumeet Mathur -
Patent number: 8084312Abstract: A transistor is fabricated upon a semiconductor substrate, where the yield strength or elasticity of the substrate is enhanced or otherwise adapted. A strain inducing layer is formed over the transistor to apply a strain thereto to alter transistor operating characteristics, and more particularly to enhance the mobility of carriers within the transistor. Enhancing carrier mobility allows transistor dimensions to be reduced while also allowing the transistor to operate as desired. However, high strain and temperature associated with fabricating the transistor result in deleterious plastic deformation. The yield strength of the silicon substrate is therefore adapted by incorporating nitrogen into the substrate, and more particularly into source/drain extension regions and/or source/drain regions of the transistor. The nitrogen can be readily incorporated during transistor fabrication by adding it as part of source/drain extension region formation and/or source/drain region formation.Type: GrantFiled: January 15, 2010Date of Patent: December 27, 2011Assignee: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, P R Chidambaram, Rajesh Khamankar, Haowen Bu, Douglas T. Grider
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Publication number: 20110212584Abstract: A method (10) of forming a transistor (100) includes treating (12) at least some of a semiconductor substrate (102) with carbon and then forming (18) a gate structure (114) over the semiconductor substrate. A channel region (122) is thereby being defined within the semiconductor substrate (102) below the gate structure (114). Source and drain regions (140, 142) are then formed (26) within the semiconductor substrate (102) on opposing sides of the channel (122) with a phosphorus dopant.Type: ApplicationFiled: February 3, 2009Publication date: September 1, 2011Applicant: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, P. R. Chidambaram
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Patent number: 7994073Abstract: A low stress sacrificial cap layer 120 having a silicon oxide liner film 130, a low stress silicon film 140, and a silicon nitride film. Alternatively, a low stress sacrificial cap layer 410 having a silicon oxide liner film 130 and a graded silicon nitride film 420. Also, methods 300, 500 for fabricating a transistor 20, 400 having a low stress sacrificial cap layer 120, 410.Type: GrantFiled: November 15, 2007Date of Patent: August 9, 2011Assignee: Texas Instruments IncorporatedInventors: Jiong-Ping Lu, Periannan Chidambaram, Srinivasan Chakravarthi
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Patent number: 7902576Abstract: A method (10) of forming a transistor (100) includes treating (12) at least some of a semiconductor substrate (102) with carbon and then forming (18) a gate structure (114) over the semiconductor substrate. A channel region (122) is thereby being defined within the semiconductor substrate (102) below the gate structure (114). Source and drain regions (140, 142) are then formed (26) within the semiconductor substrate (102) on opposing sides of the channel (122) with a phosphorus dopant.Type: GrantFiled: November 9, 2006Date of Patent: March 8, 2011Assignee: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, P.R. Chidambaram
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CAPACITOR BASED DIGITAL TO ANALOG CONVERTER LAYOUT DESIGN FOR HIGH SPEED ANALOG TO DIGITAL CONVERTER
Publication number: 20100253563Abstract: A method and system for capacitor based digital to analog converter design layout for high speed analog to digital converter are provided. The method includes arranging a plurality of metal plates to form the capacitor. Each of the plurality of metal plates includes a driven plate and a common plate. The method also includes generating a plurality of interconnects in the common plate and extending the driven plate over the plurality of interconnects. Further, the method includes shielding the common plate by the driven plate. The system includes an analog to digital converter. The analog to digital converter also includes capacitor based digital to analog converter and digital logic for controlling digital operations in the analog to digital converter. The capacitor based digital to analog converter includes a plurality of capacitors, and a comparator for comparing the analog output from the digital to analog converter with a ground potential.Type: ApplicationFiled: March 23, 2010Publication date: October 7, 2010Applicant: Cosmic Circuits Private LimitedInventors: Venkatesh Teeka Srinivasa SHETTY, Govind Kulkarni, Srinivasan Chakravarthy, Sumeet Mathur -
Patent number: 7795122Abstract: A method is disclosed for implanting and activating antimony as a dopant in a semiconductor substrate. A method is also disclosed for implanting and activating antimony to form a source/drain extension region in the formation of a transistor, in such a manner as to achieve high activation and avoid deactivation via subsequent exposure to high temperatures. This technique facilitates the formation of very thin source/drain regions that exhibit reduced sheet resistance while also suppressing short channel effects. Enhancements to these techniques are also suggested for more precise implantation of antimony to create a shallower source/drain extension, and to ensure formation of the source/drain extension region to underlap the gate. Also disclosed are transistors and other semiconductor components that include doped regions comprising activated antimony, such as those formed according to the disclosed methods.Type: GrantFiled: March 20, 2007Date of Patent: September 14, 2010Assignee: Texas Instruments IncorporatedInventors: Haowen Bu, Amitabh Jain, Srinivasan Chakravarthi, Shashank S. Ekbote
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Patent number: 7786518Abstract: Semiconductor devices and fabrication methods are provided in which disposable gates are formed over isolation regions. Sidewall structures, including disposable sidewall structures, are formed on sidewalls of the disposable gates. An epitaxially grown silicon germanium is formed in recesses defined by the sidewalls. The process provides a compressive strained channel in the device without faceting of the epitaxially grown silicon germanium.Type: GrantFiled: September 17, 2008Date of Patent: August 31, 2010Assignee: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, Periannan Chidambaram
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Publication number: 20100120215Abstract: A transistor is fabricated upon a semiconductor substrate, where the yield strength or elasticity of the substrate is enhanced or otherwise adapted. A strain inducing layer is formed over the transistor to apply a strain thereto to alter transistor operating characteristics, and more particularly to enhance the mobility of carriers within the transistor. Enhancing carrier mobility allows transistor dimensions to be reduced while also allowing the transistor to operate as desired. However, high strain and temperature associated with fabricating the transistor result in deleterious plastic deformation. The yield strength of the silicon substrate is therefore adapted by incorporating nitrogen into the substrate, and more particularly into source/drain extension regions and/or source/drain regions of the transistor. The nitrogen can be readily incorporated during transistor fabrication by adding it as part of source/drain extension region formation and/or source/drain region formation.Type: ApplicationFiled: January 15, 2010Publication date: May 13, 2010Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Srinivasan CHAKRAVARTHI, PR CHIDAMBARAM, Rajesh KHAMANKAR, Haowen BU, Douglas T. GRIDER
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Patent number: 7670892Abstract: A transistor is fabricated upon a semiconductor substrate, where the yield strength or elasticity of the substrate is enhanced or otherwise adapted. A strain inducing layer is formed over the transistor to apply a strain thereto to alter transistor operating characteristics, and more particularly to enhance the mobility of carriers within the transistor. Enhancing carrier mobility allows transistor dimensions to be reduced while also allowing the transistor to operate as desired. However, high strain and temperature associated with fabricating the transistor result in deleterious plastic deformation. The yield strength of the silicon substrate is therefore adapted by incorporating nitrogen into the substrate, and more particularly into source/drain extension regions and/or source/drain regions of the transistor. The nitrogen can be readily incorporated during transistor fabrication by adding it as part of source/drain extension region formation and/or source/drain region formation.Type: GrantFiled: November 7, 2005Date of Patent: March 2, 2010Assignee: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, Pr Chidambaram, Rajesh Khamankar, Haowen Bu, Douglas T. Grider
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Publication number: 20100038727Abstract: A method for forming carbon-doped epitaxial SiGe of a PMOS transistor by providing a semiconductor substrate having a PMOS transistor gate stack and recess etched active regions. The method includes forming carbon-doped epitaxial SiGe within the recess etched active regions. A PMOS transistor includes a semiconductor substrate, a PMOS transistor gate stack, and source/drain extensions. The PMOS transistor also includes carbon-doped epitaxial SiGe source/drain regions.Type: ApplicationFiled: October 21, 2009Publication date: February 18, 2010Applicant: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, Periannan Chidambaram, Johan Weijtmans
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Publication number: 20090308073Abstract: The present invention relates to a system for carrying out oxygen-enhanced combustion in an industrial process wherein the industrial process, an oxygen supply system or a source of oxygen, a heat recovery network, and an alternative Rankine cycle system based on a working fluid other than steam are integrated to achieve improved throughput and efficiency, and a method for oxygen-enhanced combustion in an industrial process using said system. Examples of industrial processes include cement production, steel reheat applications, glass production, aluminum and copper melting, as well as any industrial process that uses process heater, furnaces where combustion is carried out using an oxidant stream with oxygen content higher’ than that in ambient air and up to 100%.Type: ApplicationFiled: July 25, 2007Publication date: December 17, 2009Inventors: Dante Patrick Bonaquist, Minish Mahendra Shah, Vijayaraghavan Srinivasan Chakravarthy, Monica Zanfir, Raymond Francis Drnevich, Stefan Laux
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Patent number: 7572716Abstract: A method is disclosed for doping a target area of a semiconductor substrate, such as a source or drain region of a transistor, with an electronically active dopant (such as an N-type dopant used to create active areas in NMOS devices, or a P-type dopant used to create active areas in PMOS devices) having a well-controlled placement profile and strong activation. The method comprises placing a carbon-containing diffusion suppressant in the target area at approximately 50% of the concentration of the dopant, and activating the dopant by an approximately 1,040 degree Celsius thermal anneal. In many cases, a thermal anneal at such a high temperature induces excessive diffusion of the dopant out of the target area, but this relative concentration of carbon produces a heretofore unexpected reduction in dopant diffusion during such a high-temperature thermal anneal.Type: GrantFiled: April 25, 2007Date of Patent: August 11, 2009Assignee: Texas Instruments IncorporatedInventors: Haowen Bu, Shashank S. Ekbote, Borna Obradovic, Srinivasan Chakravarthi
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Publication number: 20090179236Abstract: A PMOS transistor and a method for fabricating a PMOS transistor. The method may include providing a semiconductor wafer having a PMOS transistor gate stack, source/drain extension regions, and active regions. The method may also include forming epi sidewalls, performing a ex-situ recess etch, and performing an in-situ recess etch. The ex-situ recess etch and the in-situ recess etch form recessed active regions. The PMOS transistor is formed by a method using ex-situ and in-situ etch and has epitaxial SiGe regions with a greatest width at the surface of the semiconductor wafer.Type: ApplicationFiled: March 19, 2009Publication date: July 16, 2009Applicant: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, Periannan Chidambaram, Johan Weijtmans
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Publication number: 20090166755Abstract: Semiconductor devices and fabrication methods are provided in which disposable gates are formed over isolation regions. Sidewall structures, including disposable sidewall structures, are formed on sidewalls of the disposable gates. An epitaxially grown silicon germanium is formed in recesses defined by the sidewalls. The process provides a compressive strained channel in the device without faceting of the epitaxially grown silicon germanium.Type: ApplicationFiled: September 17, 2008Publication date: July 2, 2009Applicant: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, Periannan Chidambaram
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Publication number: 20090170270Abstract: Semiconductor devices and fabrication methods are provided in which disposable gates are formed over isolation regions. Sidewall structures, including disposable sidewall structures, are formed on sidewalls of the disposable gates. An epitaxially grown silicon germanium is formed in recesses defined by the sidewalls. The process provides a compressive strained channel in the device without faceting of the epitaxially grown silicon germanium.Type: ApplicationFiled: September 17, 2008Publication date: July 2, 2009Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Srinivasan Chakravarthi, Periannan Chidambaram
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Publication number: 20090170256Abstract: A method of forming a transistor comprising forming a gate structure over an n-type semiconductor body and forming recesses substantially aligned to the gate structure in the semiconductor body. Silicon germanium is then epitaxially grown in the recesses and a silicon cap layer is formed over the silicon germanium. Further introduction of impurities into the silicon germanium to increase the melting point thereof and implanting p-type source/drain regions in the semiconductor body is included in the method. The method concludes with performing a high temperature thermal treatment.Type: ApplicationFiled: September 8, 2008Publication date: July 2, 2009Applicant: TEXAS INSTRUMENTS INCOPORATEDInventors: Srinivasan Chakravarthi, Haowen Bu, Periannan Chidambaram
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Patent number: 7553717Abstract: A PMOS transistor and a method for fabricating a PMOS transistor. The method may include providing a semiconductor wafer having a PMOS transistor gate stack, source/drain extension regions, and active regions. The method may also include forming epi sidewalls, performing a ex-situ recess etch, and performing an in-situ recess etch. The ex-situ recess etch and the in-situ recess etch form recessed active regions. The PMOS transistor is formed by a method using ex-situ and in-situ etch and has epitaxial SiGe regions with a greatest width at the surface of the semiconductor wafer.Type: GrantFiled: May 11, 2007Date of Patent: June 30, 2009Assignee: Texas Instruments IncorporatedInventors: Srinivasan Chakravarthi, Periannan Chidambaram, Johan Weijtmans