Patents by Inventor Nan Tu

Nan Tu 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: 20160013232
    Abstract: A semiconductor device includes a substrate, a semiconductor layer and a switching element. The semiconductor layer is disposed on the substrate. The semiconductor layer has a light-sensing portion and includes microstructures at a side face area corresponding to the light-sensing portion. The switching element is disposed on the semiconductor layer. In the semiconductor device, the switching element and the light-sensing portion are staggered.
    Type: Application
    Filed: July 11, 2014
    Publication date: January 14, 2016
    Inventors: Chien-Nan TU, Yu-Lung YEH, Hsing-Chih LIN, Chien-Chang HUANG
  • Patent number: 9202837
    Abstract: An image-sensor device includes a first semiconductor substrate. The image-sensor device further includes a second semiconductor substrate under the first semiconductor substrate. The first semiconductor substrate has a first dopant concentration less than a second dopant concentration of the second semiconductor substrate. A ratio of a first resistance of the first semiconductor substrate to a second resistance of the second semiconductor substrate is larger than or equal to about 100. The image-sensor device also includes a diffusion layer positioned between the first semiconductor substrate and the second semiconductor substrate. A ratio of a first thickness of the diffusion layer to a second thickness of the first semiconductor substrate ranges from about 0.1 to about 1.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: December 1, 2015
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
    Inventors: Chien-Nan Tu, Yu-Lung Yeh, Ming-Hsien Wu
  • Publication number: 20150287761
    Abstract: A semiconductor device includes a substrate including a front side, a back side opposite to the front side, and a high absorption structure disposed over the back side of the substrate and configured to absorb an electromagnetic radiation in a predetermined wavelength; and a dielectric layer including a high dielectric constant (high k) dielectric material, wherein the dielectric layer is disposed on the high absorption structure.
    Type: Application
    Filed: December 26, 2014
    Publication date: October 8, 2015
    Inventors: CHIEN-CHANG HUANG, LI-MING SUN, CHIEN NAN TU, YI-PING PAN, YU-LUNG YEH
  • Publication number: 20150279885
    Abstract: A semiconductor device is operated for sensing incident light and includes a substrate, a device layer, a semiconductor layer and a color filter layer. The device layer is disposed on the substrate and includes light-sensing regions. The semiconductor layer overlies the device layer and has a first surface and a second surface opposite to the first surface. The first surface is adjacent to the device layer. The semiconductor layer includes microstructures on the second surface. The color filter layer is disposed on the second surface of the semiconductor layer.
    Type: Application
    Filed: August 14, 2014
    Publication date: October 1, 2015
    Inventors: Chien-Nan TU, Yu-Lung YEH, Hsing-Chih LIN, Chien-Chang HUANG, Shih-Shiung CHEN
  • Publication number: 20150206915
    Abstract: An image-sensor device includes a first semiconductor substrate. The image-sensor device further includes a second semiconductor substrate under the first semiconductor substrate. The first semiconductor substrate has a first dopant concentration less than a second dopant concentration of the second semiconductor substrate. A ratio of a first resistance of the first semiconductor substrate to a second resistance of the second semiconductor substrate is larger than or equal to about 100. The image-sensor device also includes a diffusion layer positioned between the first semiconductor substrate and the second semiconductor substrate. A ratio of a first thickness of the diffusion layer to a second thickness of the first semiconductor substrate ranges from about 0.1 to about 1.
    Type: Application
    Filed: January 22, 2014
    Publication date: July 23, 2015
    Applicant: Taiwan Semiconductor Manufacturing Co., Ltd
    Inventors: Chien-Nan TU, Yu-Lung YEH, Ming-Hsien WU
  • Publication number: 20150187827
    Abstract: A semiconductor device includes an epitaxial layer including a first surface and a silicon layer disposed on the first surface and including a second surface opposite to the first surface, wherein the silicon layer includes a plurality of pillars on the second surface, a portion of the plurality of pillars on a predetermined portion of the second surface are in substantially same dimension, each of the plurality of pillars on the predetermined portion of the second surface stands substantially orthogonal to the second surface, the plurality of pillars are configured for absorbing an electromagnetic radiation of a predetermined wavelength projected from the epitaxial layer and generating an electrical energy in response to the absorption of the electromagnetic radiation.
    Type: Application
    Filed: April 3, 2014
    Publication date: July 2, 2015
    Applicant: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
    Inventors: CHIEN NAN TU, YU-LUNG YEH, MING-HSIEN WU, LI-MING SUN
  • Patent number: 7483411
    Abstract: Public wireless communications will increasingly extend into wireless LAN (WLAN) environments in order to meet the ubiquitous access, high data rate, and local services demands of future Internet appliances. By relying on IP-level services mechanisms, the Public Access Mobility LAN (PAMLAN) can simultaneously support different air interfaces, franchises for multiple services providers, and a multi-segment LAN environment including handoffs. The PAMLAN supports virtual operator LANs representing different network services providers, authorization and accounting mechanism, support of multiple air interfaces, and local IP mobility. A router associated with each base station realizes this highly distributed IP networking environment, and a QoS-enabled switched Ethernet core supports virtual networks and QoS services.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: January 27, 2009
    Assignee: NEC Corporation
    Inventors: Stephen B. Weinstein, Jun Li, Junbiao Zhang, Nan Tu
  • Publication number: 20050202680
    Abstract: A method for shrinking a dimension of a gate is provided that utilizes a thermal oxidation to form an oxide layer on a semiconductor substrate and a gate. Controlling the thickness of the oxide layer on the gate will control the channel length of a gate. The oxide layer on the gate is stripped by a suitable etching solution and then shrinkage of the dimension of the gate is achieved. That is, an ability of a photolithography is overcome, moreover; shrinking the dimension of the gate to reach an advanced process by the most economical method.
    Type: Application
    Filed: March 15, 2004
    Publication date: September 15, 2005
    Inventors: Yao-Chia Yeh, Hsiao-Wen Chuang, Chien-Nan Tu, Hsuan-Sheng Tung
  • Publication number: 20050015511
    Abstract: A Method and apparatus for dynamically discovering and utilizing unused resources for practical and efficient creation of optimized network mechanisms for data distribution. Proposed techniques for data distribution, assembly, routing and scheduling in broadband networks can be implemented as content-level server platform architecture enabled by application-level control plane. Such a platform accelerates content transfer, mirroring and replication. It applies coordinated data partitioning and resource discovery and sharing of information replication by multiple network systems. Furthermore, it harvests the unutilized bandwidth in the network by disassembling the large content to be distributed into different components. These components are then routed in spatially and temporally diverse routes through multiple paths and trees and assembled at the destination nodes. The result is accelerated content distribution, added security, scalability and robustness.
    Type: Application
    Filed: December 31, 2003
    Publication date: January 20, 2005
    Applicant: NEC Laboratories America, Inc.
    Inventors: Rauf Izmailov, Samrat Ganguly, Nan Tu, Aikaterini Varsou
  • Patent number: 6757522
    Abstract: A technique is disclosed for determining a carrier-to-noise ratio (CNR) value for a selected channel of an access network. A background noise level on the selected channel is measured during a first time interval during which none of the network nodes are transmitting signals on the selected channel. A first signal strength on the selected channel is also measured during a second time interval during which a first network node is transmitting at least one signal on the selected channel. A CNR value for the selected channel may then be calculated using the measured background noise level information and the measured first signal strength information. According to a specific implementation, the calculation of the CNR value for the selected channel is not based upon an Error Vector Magnitude value associated with the signal transmitted from the first network node.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: June 29, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: Charles Naegeli, Hungsan Chen, Nan Tu, Harihara Mahesh, Chrisanto de Jesus Leano, Nozar Azarakhsh
  • Publication number: 20020191572
    Abstract: Public wireless communications will increasingly extend into wireless LAN (WLAN) environments in order to meet the ubiquitous access, high data rate, and local services demands of future Internet appliances. By relying on IP-level services mechanisms, the Public Access Mobility LAN (PAMLAN) can simultaneously support different air interfaces, franchises for multiple services providers, and a multi-segment LAN environment including handoffs. The PAMLAN supports virtual operator LANs representing different network services providers, authorization and accounting mechanism, support of multiple air interfaces, and local IP mobility. A router associated with each base station realizes this highly distributed IP networking environment, and a QoS-enabled switched Ethernet core supports virtual networks and QoS services.
    Type: Application
    Filed: January 30, 2002
    Publication date: December 19, 2002
    Applicant: NEC USA, INC.
    Inventors: Stephen B. Weinstein, Jun Li, Junbiao Zhang, Nan Tu
  • Publication number: 20020185698
    Abstract: A gate for preventing dopants from penetrating a gate insulator comprises a polysilicon layer and an amorphous-silicon layer disposing on the polysilicon layer. The layered gate inhibits dopants from penetrating through a gate oxide layer disposing between the gate and a substrate. A source and a drain are disposed in the substrate beside the amorphous-silicon layer and the polysilicon layer.
    Type: Application
    Filed: November 9, 2001
    Publication date: December 12, 2002
    Inventors: Chung-Ching Lai, Jui-Ping Li, Tung-Ming Lai, Chien-Nan Tu
  • Publication number: 20020187616
    Abstract: A method of eliminating leakage current in shallow trench isolation is disclosed. After the trench is formed on the substrate, the liner oxide layer is formed in the furnace by introducing transdichloroethylene (TLC) into the furnace to round the corner of the trench. An electric filed near the rounded trench corner is decreased; thus, the leakage current produced in the corner of the shallow trench isolation is eliminated.
    Type: Application
    Filed: October 30, 2001
    Publication date: December 12, 2002
    Inventors: Chung-Ching Lai, Jui-Ping Li, Tung-Ming Lai, Chien-Nan Tu
  • Publication number: 20020174335
    Abstract: Mobile users access the Internet and local network services at hot spots such as airports, hotels, coffee shops and vacation resorts. The mobile users' Internet Service Providers (ISPs) are used as the single point of contact for all authentication, accounting, and authorization (AAA) transactions. AAA transactions for such ISPs acting as “virtual operators” are handled according to a system entirely based on IP. Converging both the AAA process and data transmission at the IP layer works across multiple air interfaces and is interoperable with wireless LAN cards from different vendors.
    Type: Application
    Filed: November 21, 2001
    Publication date: November 21, 2002
    Inventors: Junbiao Zhang, Jun Li, Stephen Weinstein, Nan Tu
  • Patent number: 6285960
    Abstract: A system and method are disclosed for calibrating a line card having a gain control circuit and memory device. The gain control circuit is configured to receive an input signal and an adjustment signal and to output an adjusted output signal that is based on the input signal and the adjustment signal. The gain control circuit also is configured to alter the adjustment signal to a nominal adjustment value so that an adjusted amplitude value of the adjusted signal converges with a nominal amplitude value. A first input signal, a first adjustment signal, and a nominal amplitude value are provided to the gain control circuit. A first nominal adjustment value is determined. The first nominal adjustment value is substantially permanently stored within a first address of the memory device with the first address being associated with the first input signal.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: September 4, 2001
    Assignee: Cisco Technology, Inc.
    Inventors: Joseph C. H. Fung, Mark E. Millet, Charles J. Naegeli, Nan Tu, Guenter Roeck, Yuzon Hao