Patents by Inventor Louis L. Hsu

Louis L. Hsu 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: 6768063
    Abstract: A method and structure for an electrode device, whereby a second electrode is deposited on a first electrode such that there is an increase in the capacitive coupling between the pair of conductive electrodes. The electrodes are self-aligning such that the patterning manufacturing process is insensitive to variations in the positional placement of the pattern on the substrate. Moreover, a single lithographic masking layer is used for forming the pair of electrodes, which are electrically isolated. Finally, the first electrode is offset from the second electrode by a chemical surface modification of the first electrode, and an anisotropic deposition of the second electrode which is shadowed by the first electrode.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: July 27, 2004
    Assignee: International Business Machines Corporation
    Inventors: Lawrence A. Clevenger, Louis L. Hsu, Carl J. Radens, Li-Kong Wang, Kwong Hon Wong
  • Publication number: 20040119128
    Abstract: A method and structure for a transistor device comprises forming a source, drain, and trench region in a substrate, forming a first insulator over the substrate, forming a gate electrode above the first insulator, forming a pair of insulating spacers adjoining the electrode, converting a portion of the first insulator into a metallic film, converting the metallic film into one of a silicide and a salicide film, forming an interconnect region above the trench region, forming an etch stop layer above the first insulator, the trench region, the gate electrode, and the pair of insulating spacers, forming a second insulator above the etch stop layer, and forming contacts in the second insulator. The first insulator comprises a metal oxide material, which comprises one of a HfOx and a ZrOx.
    Type: Application
    Filed: December 23, 2002
    Publication date: June 24, 2004
    Inventors: Lawrence A. Clevenger, Louis L. Hsu, Carl J. Radens, Joseph F. Shepard
  • Publication number: 20040113207
    Abstract: A method of forming an SRAM cell device includes the following steps. Form pass gate FET transistors and form a pair of vertical pull-down FET transistors with a first common body and a first common source in a silicon layer patterned into parallel islands formed on a planar insulator. Etch down through upper diffusions between cross-coupled inverter FET transistors to form pull-down isolation spaces bisecting the upper strata of pull-up and pull-down drain regions of the pair of vertical pull-down FET transistors, with the isolation spaces reaching down to the common body strata. Form a pair of vertical pull-up FET transistors with a second common body and a second common drain. Then, connect the FET transistors to form an SRAM cell.
    Type: Application
    Filed: December 11, 2002
    Publication date: June 17, 2004
    Applicant: International Business Machines Corporation
    Inventors: Louis L. Hsu, Oleg Gluschenkov, Jack A. Mandelman, Carl J. Radens
  • Patent number: 6751152
    Abstract: A memory array architecture employs a full Vdd bitline precharged voltage and a low wordline boost voltage, which is less than Vdd plus the threshold voltage of the access transistor. In a write mode, a first low level of a data bit is almost fully written to a storage element, however a second high level of the data bit is not fully written to the storage element. In a read mode, the first low level of the data bit is fully read out from the storage element, however the second high level of the data bit is not read out by utilizing the access transistor threshold voltage. This allows a sensing signal only with the first voltage level transfer to the Vdd precharged BL. A reference WL is preferably used for generating a reference bitline voltage for a differential Vdd sensing scheme. Alternatively, a single BL digital sensing scheme may be used.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: June 15, 2004
    Assignee: International Business Machines Corporation
    Inventors: Louis L. Hsu, Toshiaki K. Kirihata, Daniel W. Storaska
  • Patent number: 6751151
    Abstract: An ultra high-speed DDP-SRAM (Dual Dual-Port Static Random Access Memory) cache having a cache speed in approximately the GHz range. This is accomplished by (1) a specially designed dual-port SRAM whose size is slightly larger than that of a conventional single port SRAM, and (2) the use of a dual dual-port SRAM architecture which doubles its speed by interleaved read and write operations. A first embodiment provides a 6-T (transistor) all nMOS dual-port SRAM cell. A second embodiment provides a dual port 7T-SRAM cell which has only one port for write, and both ports for read.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: June 15, 2004
    Assignee: International Business Machines Corporation
    Inventors: Louis L. Hsu, Toshiaki K. Kirihata, Li-Kong Wang, Robert C. Wong
  • Patent number: 6751156
    Abstract: A timing system for controlling timing of data transfers within a semiconductor memory system is provided. The timing system includes a programming circuit for generating a bias signal, wherein the bias signal is biased in accordance with an incoming data transfer address corresponding to a memory address of the memory system, and a delay module for receiving the bias signal and generating an output clock signal, wherein the output clock signal is delayed in accordance with the bias signal.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: June 15, 2004
    Assignee: International Business Machines Corporation
    Inventors: Louis L. Hsu, Rajiv V. Joshi
  • Publication number: 20040108569
    Abstract: A method and structure of forming a vertical polymer transistor structure is disclosed having a first conductive layer, filler structures co-planar with the first conductive layer, a semiconductor body layer above the first conductive layer, a second conductive layer above the semiconductor body layer, and an etch stop strip positioned between a portion of the first conductive layer and the semiconductor body layer.
    Type: Application
    Filed: October 8, 2003
    Publication date: June 10, 2004
    Inventors: Tricia L. Breen, Lawrence A. Clevenger, Louis L. Hsu, Li-Kong Wang, Kwong Hon Wong
  • Patent number: 6743670
    Abstract: A method and structure for an improved DRAM (dynamic random access memory) dielectric structure, whereby a new high-k material is implemented for both the support devices used as the gate dielectric as well as the capacitor dielectric. The method forms both deep isolated trench regions used for capacitor devices, and shallow isolated trench regions for support devices. The method also forms two different insulator layers, where one insulator layer with a uniform high-k dielectric constant is used for the deep trench regions and the support regions. The other insulator layer is used in the array regions in between the shallow trench regions.
    Type: Grant
    Filed: March 6, 2003
    Date of Patent: June 1, 2004
    Assignee: International Business Machines Corporation
    Inventors: Lawrence A. Clevenger, Louis L. Hsu, Carl J Radens, Joseph F. Shepard, Jr.
  • Patent number: 6737907
    Abstract: A digitally programmable DC voltage generator system having a programming circuit for controlling a control circuit of a voltage generator system. The programming circuit receives an input control signal, processes the input control signal, and generates an output control signal to the control circuit of the voltage generator system for controlling the control circuit in accordance with the input control signal. The control circuit includes a limiter circuit and an oscillator circuit. The output control signal controls at least one of the limiter circuit for disabling the oscillator circuit upon reaching a target output voltage, and the oscillator circuit for controlling the pumping speed of the oscillator circuit.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: May 18, 2004
    Assignee: International Business Machines Corporation
    Inventors: Louis L. Hsu, Li-Kong Wang, John Atkinson Fifield, Wayne F. Ellis
  • Patent number: 6728916
    Abstract: Hierarchical built-in self-test methods and arrangement for verifying system functionality. As a result, an effective built-in self-test methodology is provided for conducting complete system-on-chip testing, to ensure both the circuit reliability and performance of system-on-chip design. As an added advantage, development costs are reduced for system-on-chip applications.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: April 27, 2004
    Assignee: International Business Machines Corporation
    Inventors: Howard H. Chen, Louis L. Hsu, Li-Kong Wang
  • Patent number: 6724029
    Abstract: A programmable memory cell structure that includes a pair of memory cells is provided. Each pair of memory cells includes a shared control gate and first and second floating gates present about the shared control gate. The first and second floating gates have respective gate regions disposed on respective sides of the control gate. Dielectric structures are present between the control gate and respective ones of the gate regions of the floating gates. The control gate and gates of the first and second floating gates are formed within a single lithographic square.
    Type: Grant
    Filed: February 21, 2002
    Date of Patent: April 20, 2004
    Assignee: International Business Machines Corporation
    Inventors: Louis L. Hsu, Chung H. Lam, Jack A. Mandelman, Carl J. Radens, William R. Tonti
  • Patent number: 6720595
    Abstract: A method and structure for a photodiode array comprising a plurality of photodiode cores, light sensing sidewalls along an exterior of the cores, logic circuitry above the cores, trenches separating the cores, and a transparent material in the trenches is disclosed. With the invention, the sidewalls are perpendicular to the surface of the photodiode that receives incident light. The light sensing sidewalls comprise a junction region that causes electron transfer when struck with light. The sidewalls comprise four vertical sidewalls around each island core. The logic circuitry blocks light from the core so light is primarily only sensed by the sidewalls.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: April 13, 2004
    Assignee: International Business Machines Corporation
    Inventors: Lawrence A. Clevenger, Louis L. Hsu, Carl J. Radens, Li-Kong Wang, Kwong Hon Wong
  • Patent number: 6714476
    Abstract: A DRAM array is provided capable of being interchanged between single-cell and twin-cell array operation for storing data in a single-cell or a twin-cell array format, respectively. Preferably, the DRAM array is operated in the single-cell array format during one operating mode and the DRAM array is operated in the twin-cell array format during another operating mode. Wordline decoding circuitry is included for interchanging the DRAM array between single-cell and twin-cell array operation. The wordline decoding circuitry includes a pre-decoder circuit for receiving a control signal and outputting logic outputs to wordline activation circuitry. The wordline activation circuitry then activates at least one wordline traversing the array for interchanging memory cells within the DRAM array between single-cell array operation and twin-cell array operation. Methods are also provided for converting data stored within the DRAM array from the single-cell to the twin-cell array format, and vice versa.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: March 30, 2004
    Assignee: IBM Corporation
    Inventors: Louis L. Hsu, Rajiv V. Joshi, Fariborz Assaderaghi
  • Patent number: 6713791
    Abstract: A T-RAM array having a planar cell structure is presented. The T-RAM array includes n-MOS and p-MOS support devices which are fabricated by sharing process implant steps with T-RAM cells of the T-RAM array. A method is also presented for fabricating the T-RAM array having the planar cell structure. The method entails simultaneously fabricating a first portion of a T-RAM cell and the n-MOS support device; simultaneously fabricating a second portion of the T-RAM cell and the p-MOS support device; and finishing the fabrication of the T-RAM cell by interconnecting the T-RAM cell with the p-MOS and n-MOS support devices. The first portion of the T-RAM cell is a transfer gate and the second portion of the T-RAM cell is a gated-lateral thyristor storage element. Accordingly, process steps in fabricating the T-RAM cells are shared with process steps in fabricating the n-MOS and p-MOS support devices. The n-MOS and p-MOS support devices refer to sense amplifiers, wordline drivers, column and row decoders, etc.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: March 30, 2004
    Assignee: IBM Corporation
    Inventors: Louis L. Hsu, Rajiv V. Joshi, Fariborz Assaderaghi, Dan Moy, Werner Rausch, James Culp
  • Publication number: 20040056285
    Abstract: A method and structure for a metal oxide semiconductor transistor having a substrate, a well region in the substrate, source and drain regions on opposite sides of the well region in the substrate, a gate insulator over the well region of the substrate, a polysilicon gate conductor over the gate insulator, and metallic spacers on sides of the gate conductor.
    Type: Application
    Filed: September 23, 2002
    Publication date: March 25, 2004
    Inventors: Cyril Cabral, Lawrence A. Clevenger, Louis L. Hsu, Joseph F. Shepard, Kwong Hon Wong
  • Publication number: 20040056270
    Abstract: A memory system having a plurality of T-RAM cells arranged in an array is presented where each T-RAM cell has dual vertical devices and is fabricated over a SiC substrate. Each T-RAM cell has a vertical thyristor and a vertical transfer gate. The top surface of each thyristor is coplanar with the top surface of each transfer gate within the T-RAM array to provide a planar cell structure for the T-RAM array. A method is also presented for fabricating the T-RAM array having the vertical thyristors, the vertical transfer gates and the planar cell structure over the SiC substrate.
    Type: Application
    Filed: September 19, 2003
    Publication date: March 25, 2004
    Applicant: International Business Machines Corporation
    Inventors: Louis L. Hsu, Li-Kong Wang
  • Publication number: 20040038489
    Abstract: A method and structure for an integrated circuit transistor structure includes a gate conductor that has a first conductive material and a second material. The invention has non-deformable spacers adjacent the gate conductor and a gap between the gate conductor and the spacer. The first conductive material can be polysilicon and the second material can be either a metal or a polymer. The second material acts as a placeholder for the gap. In the invention, the gap holds ambient gas and decreases resistance of the gate conductor.
    Type: Application
    Filed: August 21, 2002
    Publication date: February 26, 2004
    Inventors: Lawrence A. Clevenger, George C. Feng, James M.E. Harper, Louis L. Hsu
  • Publication number: 20040038474
    Abstract: An integrated circuit structure is disclosed that comprises a pair of capacitors, each having metal plates separated by an insulator, and metal gate semiconductor transistors electrically connected to the capacitors. The metal gate of the transistors and one of the metal plates of each of the capacitors comprise the same metal level in the integrated circuit structure. More specifically, each of the capacitors comprise a vertical capacitor having an upper metal plate vertically over a lower metal plate and each metal gate of the transistors and each upper metal plate of the capacitors comprise the same metal level in the integrated circuit structure.
    Type: Application
    Filed: August 21, 2002
    Publication date: February 26, 2004
    Inventors: Lawrence A. Clevenger, Louis L. Hsu, Kwong Hon Wong
  • Patent number: 6697909
    Abstract: A method and apparatus for refreshing data in a dynamic random access memory (DRAM) cache memory in a computer system are provided to perform a data refresh operation without refresh penalty (e.g., delay in a processor). A data refresh operation is performed with respect to a DRAM cache memory by detecting a request address from a processor, stopping a normal refresh operation when the request address is detected, comparing the request address with TAG addresses stored in a TAG memory, generating refresh addresses to refresh data stored in the cache memory, each of which is generated based on an age of data corresponding to the refresh address, and performing a read/write operation on a wordline accessed by the request addresses and refreshing data on wordlines accessed by the refresh addresses, wherein the read/write operation and the refreshing of data are performed simultaneously.
    Type: Grant
    Filed: September 12, 2000
    Date of Patent: February 24, 2004
    Assignee: International Business Machines Corporation
    Inventors: Li-Kong Wang, Louis L. Hsu
  • Publication number: 20040026734
    Abstract: A semiconductor structure (and method for forming) having transistors having both metal gates and polysilicon gates on a single substrate in a single process is disclosed. The method forms a gate dielectric layer on the substrate and forms the metal seed layer on the gate oxide layer. The method patterns the metal seed layer to leave metal seed material in metal gate seed areas above the substrate. Next, the method patterns a polysilicon layer into polysilicon structures above the substrate. Some of the polysilicon structures comprise sacrificial polysilicon structures on the metal gate seed areas and the remaining ones of the polysilicon structures comprise the polysilicon gates. The patterning of the polysilicon gates forms the sacrificial gates above all the metal gate seed areas. Following that, the invention forms sidewall spacers, and source and drain regions adjacent the polysilicon structures.
    Type: Application
    Filed: August 6, 2002
    Publication date: February 12, 2004
    Inventors: Lawrence A. Clevenger, Louis L. Hsu, Kwong Hon Wong