Patents by Inventor Allen A. Chang

Allen A. Chang 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: 8344519
    Abstract: A battery protection package assembly is disclosed. The assembly includes a power control integrated circuit (IC) with pins for a supply voltage input (VCC) and a ground (VSS) on a first side of the power control IC. First and second common-drain metal oxide semiconductor field effect transistors (MOSFETs) are electrically coupled to the power control IC. The power control IC and the first and second common-drain metal oxide semiconductor field effect transistors (MOSFET) are co-packaged on a common die pad. The power control IC is vertically stacked on top of one or more of the first and second common-drain MOSFETs. Leads coupled to a supply voltage input (VCC) and a ground (VSS) of the power control IC are on a first side of the common die pad.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: January 1, 2013
    Assignee: Alpha & Omega Semiconductor Incorporated
    Inventors: Jun Lu, Allen Chang, Xiaotian Zhang
  • Publication number: 20120313613
    Abstract: A high voltage and high power boost converter is disclosed. The boost converter includes a boost converter IC and a discrete Schottky diode, both of which are co-packaged on a standard single common die pad. The bottom cathode is electrically connected to the common die pad. It is emphasized that this abstract is being provided to comply with rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. This abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.
    Type: Application
    Filed: June 22, 2012
    Publication date: December 13, 2012
    Applicant: Alpha and Omega Semiconductor Incorporated
    Inventors: Allen Chang, Wai-Keung Peter Cheng
  • Publication number: 20120314091
    Abstract: A real-time audio/video transmission device is wirelessly linked to a smart handheld device for transmitting an AV signal to the latter for playing, and includes a central processing unit for receiving and converting image and sound signals into an AV signal; an image capture section electrically connected to the CPU for capturing and converting an external image into an image signal for transmitting to the CPU; a sound capture unit electrically connected to the CPU for capturing and converting an external sound into a sound signal for transmitting to the CPU; and a wireless transmission section electrically connected to the CPU for receiving the AV signal and wirelessly transmitting the latter to the smart handheld device. With the smart handheld device, the real-time AV transmission device does not require a display and can have reduced manufacturing cost and be monitored from a remote location while provides diversified functions.
    Type: Application
    Filed: December 27, 2011
    Publication date: December 13, 2012
    Applicant: DIGILIFE TECHNOLOGIES CO., LTD.
    Inventors: CHEN-PING YANG, ALLEN CHANG
  • Patent number: 8296807
    Abstract: Multiple channel maps are embedded in a television transmission and the appropriate channel corresponding to the particular television service used by the viewer is downloaded for use with the television receiver. Each channel map is accompanied by a channel map identifier which identifies the source of the television transmission and a geographic identifier. The source of a television transmission is automatically detected by monitoring the radio-frequency spectrum allocations of telecast stations. The geographic area identifier is determined by comparison with a user inputted geographic area identifier. The channel map having a channel map identifier corresponding to the detected television transmission source and the user inputted geographic area identifier is downloaded and stored for future use.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: October 23, 2012
    Assignee: Index Systems, Inc.
    Inventors: Henry C. Yuen, Daniel S. Kwoh, Allen Chang
  • Patent number: 8207602
    Abstract: A high voltage and high power boost converter is disclosed. The boost converter includes a boost converter IC and a discrete Schottky diode, both of which are co-packaged on a standard single common die pad.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: June 26, 2012
    Assignee: Alpha and Omega Semiconductor Incorporated
    Inventors: Allen Chang, Wai-Keung Peter Cheng
  • Patent number: 8148817
    Abstract: A DC-DC buck converter in multi-die package is proposed having an output inductor, a low-side Schottky diode and a high-side vertical MOSFET controlled by a power regulating controller (PRC). The multi-die package includes a first die pad with the Schottky diode placed there on side by side with the vertical MOSFET. The PRC die is attached atop the first die pad via an insulating die bond. Alternatively, the first die pad is grounded. The vertical MOSFET is a top drain N-channel FET, the substrate of Schottky diode die is its anode. The Schottky diode and the vertical MOSFET are stacked atop the first die pad. The PRC is attached atop the first die pad via a conductive die bond. The Schottky diode die can be supplied in a flip-chip configuration with cathode being its substrate. Alternatively, the Schottky diode is supplied with anode being its substrate without the flip-chip configuration.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: April 3, 2012
    Assignee: Alpha & Omega Semiconductor, Inc.
    Inventors: François Hébert, Allen Chang
  • Patent number: 8122471
    Abstract: Multiple channel maps are embedded in a television transmission and the appropriate-channel corresponding to the particular television service used by the viewer is downloaded for use with the television receiver. Each channel map is accompanied by a channel map identifier which identifies the source of the television transmission and a geographic identifier. The source of a television transmission is automatically detected by monitoring the radio-frequency spectrum allocations of telecast stations. The geographic area identifier is determined by comparison with a user inputted geographic area identifier. The channel map having a channel map identifier corresponding to the detected television transmission source and the user inputted geographic area identifier is downloaded and stored for future use.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: February 21, 2012
    Assignee: Index Systems, Inc.
    Inventors: Henry C. Yuen, Daniel S. Kwoh, Allen Chang
  • Publication number: 20120016849
    Abstract: A computer-based method and system for sharing and deconflicting data changes amongst a plurality of replication sites. In a particular embodiment, data changes at sites to data objects are tracked by each site on a per-data object basis using per-data object version vectors. In another particular embodiment, data changes at sites to links connecting two data objects are tracked by each site on a per-link set basis using per-link set version vectors. In another particular embodiment, per-object version vectors are used to detect a conflict resulting from concurrent changes at two or more sites in which one of the concurrent changes includes an object resolution change.
    Type: Application
    Filed: July 15, 2010
    Publication date: January 19, 2012
    Inventors: John Kenneth Garrod, John Antonio Carrino, Katherine Brainard, Jacob Scott, Allen Chang
  • Publication number: 20110316090
    Abstract: A boost converter for high power and high output voltage applications includes a low voltage controller integrated circuit and a high voltage, vertical, discrete field effect transistor, both of which are packed in a single package on separate electrically isolated die pads.
    Type: Application
    Filed: September 1, 2011
    Publication date: December 29, 2011
    Applicant: ALPHA & OMEGA SEMICONDUCTOR, LTD.
    Inventors: ALLEN CHANG, Wai-Keung Peter Cheng
  • Publication number: 20110278709
    Abstract: A battery protection package assembly is disclosed. The assembly includes a power control integrated circuit (IC) with pins for a supply voltage input (VCC) and a ground (VSS) on a first side of the power control IC. First and second common-drain metal oxide semiconductor field effect transistors (MOSFETs) are electrically coupled to the power control IC. The power control IC and the first and second common-drain metal oxide semiconductor field effect transistors (MOSFET) are co-packaged on a common die pad. The power control IC is vertically stacked on top of one or more of the first and second common-drain MOSFETs. Leads coupled to a supply voltage input (VCC) and a ground (VSS) of the power control IC are on a first side of the common die pad.
    Type: Application
    Filed: April 18, 2011
    Publication date: November 17, 2011
    Applicant: ALPHA & OMEGA SEMICONDUCTOR INCORPORATED
    Inventors: Jun Lu, Allen Chang, Xiaotian Zhang
  • Patent number: 8049315
    Abstract: A semiconductor package assembly may include a lead frame having a die bonding pad and plurality of leads coupled to the first die bonding pad. A vertical semiconductor device may be bonded to the die bonding pad. The device may have a conductive pad electrically connected to one lead through a first bond wire. An electrically isolated conductive trace may be formed from a layer of conductive material of the first semiconductor device. The conductive trace provides an electrically conductive path between the first bond wire and a second bond wire. The conductive path may either pass underneath a third bond wire thereby avoiding the third bond wire crossing another bond wire, or the conductive path may result in a reduced length for the first and second bond wires that is less than a predetermined maximum length.
    Type: Grant
    Filed: January 14, 2011
    Date of Patent: November 1, 2011
    Assignee: Alpha & Omega Semiconductors, Ltd.
    Inventors: Jun Lu, Anup Bhalla, Xiaobin Wang, Allen Chang, Kenny Man Sheng Hu, Xiaotian Zhang
  • Patent number: 8008897
    Abstract: A boost converter for high power and high output voltage applications includes a low voltage controller integrated circuit and a high voltage, vertical, discrete field effect transistor, both of which are packed in a single package.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: August 30, 2011
    Assignee: Alpha & Omega Semiconductor, Ltd
    Inventors: Allen Chang, Wai-Keung Peter Cheng
  • Publication number: 20110141375
    Abstract: Multiple channel maps are embedded in a television transmission and the appropriate channel corresponding to the particular television service used by the viewer is downloaded for use with the television receiver. Each channel map is accompanied by a channel map identifier which identifies the source of the television transmission and a geographic identifier. The source of a television transmission is automatically detected by monitoring the radio-frequency spectrum allocations of telecast stations. The geographic area identifier is determined by comparison with a user inputted geographic area identifier. The channel map having a channel map identifier corresponding to the detected television transmission source and the user inputted geographic area identifier is downloaded and stored for future use.
    Type: Application
    Filed: February 23, 2011
    Publication date: June 16, 2011
    Applicant: INDEX SYSTEMS, INC.
    Inventors: Henry C. Yuen, Daniel S. Kwoh, Allen Chang
  • Publication number: 20110108998
    Abstract: A semiconductor package assembly may include a lead frame having a die bonding pad and plurality of leads coupled to the first die bonding pad. A vertical semiconductor device may be bonded to the die bonding pad. The device may have a conductive pad electrically connected to one lead through a first bond wire. An electrically isolated conductive trace may be formed from a layer of conductive material of the first semiconductor device. The conductive trace provides an electrically conductive path between the first bond wire and a second bond wire. The conductive path may either pass underneath a third bond wire thereby avoiding the third bond wire crossing another bond wire, or the conductive path may result in a reduced length for the first and second bond wires that is less than a predetermined maximum length.
    Type: Application
    Filed: January 14, 2011
    Publication date: May 12, 2011
    Applicant: ALPHA & OMEGA SEMICONDUCTOR INCORPORATED
    Inventors: Jun Lu, Anup Bhalla, Xiaobin Wang, Allen Chang, Man Sheng Hu, Xiaotian Zhang
  • Publication number: 20110095833
    Abstract: A method for generating an oscillator signal uses a multiphase oscillator having a plurality of input stages and a reference stage. Each input stage produces an input stage voltage that represents a phase for the oscillator. The input stage voltages produced by each of the input stages are compared to a reference voltage produced by the reference stage. An input stage having a maximum input stage voltage is selected and an output of the selected input stage having the maximum input stage voltage is changed. A current need of the oscillator is detected with a negative feedback loop coupled to the reference stage. An appropriate supply current is provided to each input stage with the negative feedback loop.
    Type: Application
    Filed: December 29, 2010
    Publication date: April 28, 2011
    Applicant: Alpha and Omega Semiconductor Incorporated
    Inventors: Behzad Mohtashemi, Allen Chang
  • Patent number: 7898092
    Abstract: A stacked-die package for battery protection is disclosed. The battery protection package includes a power control integrated circuit (IC) stacked on top of integrated dual common-drain metal oxide semiconductor field effect transistors (MOSFETs) or two discrete MOSFETs. The power control IC is either stacked on top of one MOSFET or on top of and overlapping both two MOSFETs.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: March 1, 2011
    Assignee: Alpha & Omega Semiconductor,
    Inventors: Jun Lu, Allen Chang, Xiaotian Zhang
  • Patent number: 7893778
    Abstract: An oscillator includes a reference stage and multiple phase stages. The reference stage has a reference transistor having a gate coupled to a voltage reference and a drain coupled to a reference current source. Each phase stage includes a transistor, two current sources, a capacitor, switch, inverter, and latch. The transistor has a drain coupled to a first current source, a gate coupled to a node and a source coupled to the reference transistor's source. The capacitor and switch couple between the node and ground. The second current source couples to the node. The transistor's drain couples to the inverter's input. The inverter's output couples to the latch's set input. The latch's output couples to the switch. The inverter output also couples to the reset input of a subsequent phase stage's latch. The inverter output for a last stage couples to the reset input of a first stage latch.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: February 22, 2011
    Assignee: Alpha & Omega Semiconductor Incorporated
    Inventors: Behzad Mohtashemi, Allen Chang
  • Patent number: 7884454
    Abstract: A semiconductor package assembly may include a lead frame having a die bonding pad and plurality of leads coupled to the first die bonding pad. A vertical semiconductor device may be bonded to the die bonding pad. The device may have a conductive pad electrically connected to one lead through a first bond wire. An electrically isolated conductive trace may be formed from a layer of conductive material of the first semiconductor device. The conductive trace provides an electrically conductive path between the first bond wire and a second bond wire. The conductive path may either pass underneath a third bond wire thereby avoiding the third bond wire crossing another bond wire, or the conductive path may result in a reduced length for the first and second bond wires that is less than a predetermined maximum length.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: February 8, 2011
    Assignee: Alpha & Omega Semiconductor, Ltd
    Inventors: Jun Lu, Anup Bhalla, Xiaobin Wang, Allen Chang, Man Sheng Hu, Xiaotian Zhang
  • Publication number: 20110012194
    Abstract: A DC-DC buck converter in multi-die package is proposed having an output inductor, a low-side Schottky diode and a high-side vertical MOSFET controlled by a power regulating controller (PRC). The multi-die package includes a first die pad with the Schottky diode placed there on side by side with the vertical MOSFET. The PRC die is attached atop the first die pad via an insulating die bond. Alternatively, the first die pad is grounded. The vertical MOSFET is a top drain N-channel FET, the substrate of Schottky diode die is its anode. The Schottky diode and the vertical MOSFET are stacked atop the first die pad. The PRC is attached atop the first die pad via a conductive die bond. The Schottky diode die can be supplied in a flip-chip configuration with cathode being its substrate. Alternatively, the Schottky diode is supplied with anode being its substrate without the flip-chip configuration.
    Type: Application
    Filed: September 24, 2010
    Publication date: January 20, 2011
    Inventors: François Hébert, Allen Chang
  • Patent number: 7825508
    Abstract: A DC-DC buck converter in multi-die package is proposed having an output inductor, a low-side Schottky diode and a high-side vertical MOSFET controlled by a power regulating controller (PRC). The multi-die package includes a first die pad with the Schottky diode placed there on side by side with the vertical MOSFET. The PRC die is attached atop the first die pad via an insulating die bond. Alternatively, the first die pad is grounded. The vertical MOSFET is a top drain N-channel FET, the substrate of Schottky diode die is its anode. The Schottky diode and the vertical MOSFET are stacked atop the first die pad. The PRC is attached atop the first die pad via a conductive die bond. The Schottky diode die can be supplied in a flip-chip configuration with cathode being its substrate. Alternatively, the Schottky diode is supplied with anode being its substrate without the flip-chip configuration.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: November 2, 2010
    Assignee: Alpha Omega Semiconductor, Inc.
    Inventors: François Hébert, Allen Chang