Patents by Inventor Charu Sardana

Charu Sardana 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: 20180083091
    Abstract: An on-die-capacitor structure includes a first capacitor and a second capacitor. The first capacitor may have first and second terminals. The first and second terminals are directly connected to first and second power supply rail structures, respectively. The first power supply rail structure is different from the second power supply rail structure. The second capacitor may have third and fourth terminals. The second capacitor is connected in series between the second power supply rail structure and a third power supply rail structure. The third power supply rail structure is different from the first and second power supply rail structures. The third and fourth terminals are directly connected to the second and third power supply rail structures, respectively. The first capacitor may have a first capacitance and the second capacitor structure may have a second capacitance that is greater than the first capacitance.
    Type: Application
    Filed: November 28, 2017
    Publication date: March 22, 2018
    Inventors: Kyung Suk Oh, Charu Sardana, Yanzhong Xu, Guang Chen
  • Patent number: 9859358
    Abstract: An on-die-capacitor structure includes a first capacitor and a second capacitor. The first capacitor may have first and second terminals. The first and second terminals are directly connected to first and second power supply rail structures, respectively. The first power supply rail structure is different from the second power supply rail structure. The second capacitor may have third and fourth terminals. The second capacitor is connected in series between the second power supply rail structure and a third power supply rail structure. The third power supply rail structure is different from the first and second power supply rail structures. The third and fourth terminals are directly connected to the second and third power supply rail structures, respectively. The first capacitor may have a first capacitance and the second capacitor structure may have a second capacitance that is greater than the first capacitance.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: January 2, 2018
    Assignee: Altera Corporation
    Inventors: Kyung Suk Oh, Charu Sardana, Yanzhong Xu, Guang Chen
  • Publication number: 20160351654
    Abstract: An on-die-capacitor structure includes a first capacitor and a second capacitor. The first capacitor may have first and second terminals. The first and second terminals are directly connected to first and second power supply rail structures, respectively. The first power supply rail structure is different from the second power supply rail structure. The second capacitor may have third and fourth terminals. The second capacitor is connected in series between the second power supply rail structure and a third power supply rail structure. The third power supply rail structure is different from the first and second power supply rail structures. The third and fourth terminals are directly connected to the second and third power supply rail structures, respectively. The first capacitor may have a first capacitance and the second capacitor structure may have a second capacitance that is greater than the first capacitance.
    Type: Application
    Filed: May 26, 2015
    Publication date: December 1, 2016
    Inventors: Kyung Suk Oh, Charu Sardana, Yanzhong Xu, Guang Chen
  • Patent number: 9196749
    Abstract: A programmable device with a metal oxide semiconductor field effect transistor (MOSFET) surrounded by a programmable substrate region is described. The MOSFET has a source and drain region separated by a channel region with an insulating region and gate disposed above the channel region. A junction disposed within the substrate region controls the programmable substrate region. Biasing the junction depletes the substrate region, which isolates the body of the MOSFET from a secondary well. When the junction is left unbiased, the body of the MOSFET is electrically coupled to the secondary well.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: November 24, 2015
    Assignee: Altera Corporation
    Inventors: Charu Sardana, Albert Ratnakumar, Qi Xiang, Bradley Jensen
  • Patent number: 8609486
    Abstract: Integrated circuits with transistors and decoupling capacitor structures are provided. A decoupling capacitor structure may include multiple deep trench structures formed in a semiconductor substrate. The deep trench structures may each be lined with high-? dielectric material. A conductive metal layer for use in controlling threshold voltages associated with n-channel or p-channel devices may be formed over the high-? dielectric liner. Conductive material such as aluminum may be used to fill the remaining trench cavity. The high-? dielectric liner may be simultaneously deposited into the deep trench structures and gate regions of the transistors. In one suitable arrangement, the deep trench structures and transistor metal gates for at least a selected type of transistors may be formed in parallel. In another suitable arrangement, the deep trench structures and the transistor metal gates may be formed in separate steps.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: December 17, 2013
    Assignee: Altera Corporation
    Inventors: Peter Smeys, Charu Sardana
  • Publication number: 20100090308
    Abstract: Metal-oxide-metal capacitors with bar vias are provided for integrated circuits. The capacitors may be formed in the interconnect layers of integrated circuits. Stacked bar vias and metal lines in the interconnect layers may be connected to form conductive vertical plates that span multiple interconnect layers. The capacitors with bar vias may be formed by placing multiple vertical plates formed from stacked bar vias and metal lines parallel to each other, alternating the polarity of adjacent vertical parallel plates to form multiple parallel plate capacitors. The parallel plates may be interconnected to form first and second terminals in a capacitor.
    Type: Application
    Filed: October 10, 2008
    Publication date: April 15, 2010
    Inventors: Charu Sardana, Albert Ratnakumar, Bradley Jensen, Jeffrey T. Watt
  • Publication number: 20090302421
    Abstract: A deep trench capacitor includes a trench having walls and a floor. The deep trench capacitor also includes a layer of gate oxide on the walls and floor. Gate polysilicon is deposited over the gate oxide.
    Type: Application
    Filed: June 9, 2008
    Publication date: December 10, 2009
    Inventors: Charu Sardana, Bradley Jensen, Irfan Rahim, Jeffrey T. Watt
  • Patent number: 6265746
    Abstract: Provided is a high resistance value vertically-integrated semiconductor interconnect with resistance in the 10 k&OHgr;-10 G&OHgr; range, and a process to make such highly resistive interconnects together with low resistive interconnects in a precisely controllable manner. In addition, provided is an SRAM cell with highly resistive contact processing for a pull-up resistor.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: July 24, 2001
    Assignee: Altera Corporation
    Inventors: Raminda U. Madurawe, Charu Sardana, Peter J. McElheny, Richard G. Smolen
  • Patent number: 6127217
    Abstract: Provided is a high resistance value vertically-integrated semiconductor interconnect, and a process to make such highly resistive interconnects together with low resistive interconnects in a precisely controllable manner. In addition, provided is an SRAM cell with highly resistive contact processing for a pull-up resistor.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: October 3, 2000
    Assignee: Altera Corporation
    Inventors: Raminda U. Madurawe, Charu Sardana, Peter J. McElheny, Richard G. Smolen