Patents by Inventor Rakesh B. Sethi

Rakesh B. Sethi 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).

  • Patent number: 6586806
    Abstract: A transistor includes a non-self-aligned gate-terminal junction in a substrate having a relatively thick oxide layer disposed between a gate region and a terminal region and a relatively thin oxide layer disposed between the gate structure and the substrate. The terminal region may be the drain region of the transistor and it may include a buried N+ region within the substrate. The transistor may be formed in a p-well. Further, the transistor may also include a self-aligned gate-terminal junction between the gate structure and a source region. In a further embodiment, a transistor fabrication method includes forming an active area in a substrate and implanting an N-type impurity into a first terminal region of the active area. An oxide layer is differentially grown over the active area so that the oxide layer has a first thickness over the first terminal region and a second thickness over the remaining portion of the active area.
    Type: Grant
    Filed: September 3, 1997
    Date of Patent: July 1, 2003
    Assignee: Cypress Semiconductor Corporation
    Inventors: Sheng Yueh Pai, Fredrick B. Jenne, Rakesh B. Sethi
  • Patent number: 5780889
    Abstract: The presently preferred embodiment of the invention provides a memory structure that eliminates the thick gate associated with the offset of the FAMOS transistor and reduces the standard 225 angstrom offset to a 100 angstrom offset required for FN tunnelling. The 100 angstrom offset is realized uniformly underneath the entire area of the floating poly. The invention uses transistors each having a 100 angstrom offset to realize both erase and programming functions. The present invention realizes an erasing feature through an erase transistor and an ERL line. However, the programming of the cell will be realized through the programming transistor. As a result, a double poly flash cell will function like an EEPROM. This functioning eliminates the hot electron tunnelling required to program conventional double poly flash cells and results in a significant reduction in chip real estate. The reduction allows the present invention to be scaled to next generation architectures.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: July 14, 1998
    Assignee: Cypress Semiconductor Corp.
    Inventor: Rakesh B. Sethi
  • Patent number: 5573973
    Abstract: An integrated circuit based on submicron technology is disclosed herein along with the way in which it is formed. The integrated circuit is comprised of an arrangement of different substances which are combined to form its body structure and which define within the body structure an array of electronic components including a diamond thin film coated trench arrangement. In one embodiment disclosed herein, the array of electronic component includes two such components which are in close proximity to and must be electrically isolated from one another and the diamond thin film coated trench arrangement serves to electrically isolate these two components from each other. In a second embodiment, the diamond thin film coated trench is specifically designed to serve as a capacitor forming part of, for example, a DRAM, a mixed signal circuit or a neuro-fuzzy circuit.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: November 12, 1996
    Assignee: National Semiconductor Corporation
    Inventors: Rakesh B. Sethi, Cheng-Chen Hsueh
  • Patent number: 5432749
    Abstract: An arrangement for reducing the erratic operation of a non-volatile memory cell caused by the accumulation of holes at a specific location within the cell during the electrical erasing of the cell includes a layer of hole confinement material positioned at the specific location the holes accumulate for containing the holes in a specific area. The arrangement also includes an arrangement for removing the holes from the containment area. A method of reducing the erratic operation of a non-volatile memory cell caused by the accumulation of holes at a specific location within the cell during the electrical erasing of the cell includes the step of providing a layer of hole confinement material positioned at the specific location the holes accumulate for containing the holes in the layer of hole confinement material.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: July 11, 1995
    Assignee: National Semiconductor Corporation
    Inventor: Rakesh B. Sethi
  • Patent number: 5314768
    Abstract: A thin film mask for use in an X-ray lithographic process is disclosed herein along with a method of making the mask which is comprised of a diamond thin film layer supported on one surface of an X-ray transparent non-diamond substrate, for example silicon. A predetermined pattern of ions of a substance opaque to X-rays, for example a heavy atomic number substance such as gold, tungsten or cesium, is introduced into the diamond thin film layer as opposed to being deposited thereon. In one embodiment disclosed herein, this is accomplished by means of ion implantation, and in a second embodiment by means of an ion beam direct write device.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: May 24, 1994
    Assignee: National Semiconductor Corporation
    Inventor: Rakesh B. Sethi
  • Patent number: 5284786
    Abstract: A split floating gate EEPROM memory cell formed in a P-type silicon substrate includes source and drain buried n+ diffusion regions formed in the silicon substrate to define a substrate channel region therebetween. A layer of floating gate oxide about 400.ANG. thick is formed over the source and drain regions and over the channel region. The floating gate oxide includes a region of thin tunnel oxide about 80-100.ANG. thick formed therein over the drain region. A floating gate is formed on the floating gate oxide to extend over the channel region and includes a portion that extends over the tunnel oxide. The floating gate comprises a first layer of polysilicon about 300-600.ANG. thick, a silicon dioxide layer about 20-50.ANG. thick formed on the first layer of polysilicon, and a second layer of polysilicon about 2000.ANG. thick formed on the silicon dioxide layer. A layer of ONO is formed on the floating gate and a polysilicon control gate is formed on the layer of ONO.
    Type: Grant
    Filed: August 14, 1992
    Date of Patent: February 8, 1994
    Assignee: National Semiconductor Corporation
    Inventor: Rakesh B. Sethi