Patents by Inventor Andrew P. Krebs

Andrew P. Krebs 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: 9099137
    Abstract: Amplifier architectures are provided for current sensing applications. An amplifier includes a load device, an operational amplifier, a current source, and a bipolar transistor. The operational amplifier has a first input terminal connected to a first input node that receives an input current, and a second input terminal connected to a second input node that receives a reference voltage. The current source is connected to an output of the operational amplifier. The operational amplifier, the current source, and the bipolar transistor form a feedback loop that generates and maintains a bias voltage on the first input node based on the reference voltage applied to the second input node. The bipolar transistor amplifies the input current received on the first input node, and generates an amplified input current. The load device converts the amplified input current to an output voltage, wherein the output voltage is used to sense the input current.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: August 4, 2015
    Assignee: Avago Technologies General IP (Singapore) PTE. LTD
    Inventors: Brad A. Natzke, Cameron C. Rabe, Hong Jiang, Andrew P. Krebs, Jason P. Brenden
  • Publication number: 20140240870
    Abstract: Amplifier architectures are provided for current sensing applications. An amplifier includes a load device, an operational amplifier, a current source, and a bipolar transistor. The operational amplifier has a first input terminal connected to a first input node that receives an input current, and a second input terminal connected to a second input node that receives a reference voltage. The current source is connected to an output of the operational amplifier. The operational amplifier, the current source, and the bipolar transistor form a feedback loop that generates and maintains a bias voltage on the first input node based on the reference voltage applied to the second input node. The bipolar transistor amplifies the input current received on the first input node, and generates an amplified input current. The load device converts the amplified input current to an output voltage, wherein the output voltage is used to sense the input current.
    Type: Application
    Filed: May 8, 2014
    Publication date: August 28, 2014
    Applicant: LSI Corporation
    Inventors: Brad A. Natzke, Cameron C. Rabe, Hong Jiang, Andrew P. Krebs, Jason P. Brenden
  • Patent number: 8792198
    Abstract: A balanced amplifier with a relatively high input impedance with wide bandwidth for use as a fly-height sensor head preamplifier in a magnetic storage read system. The balanced amplifier has two substantially identical halves, each amplifier half having an input transistor, responsive to the input node of the amplifier half disposed in series with a cross-coupling transistor receiving a buffered cross-coupled version of the input signal applied to the other half of the balanced amplifier. Use of cascoded transistors and voltage-followers to limit voltages across various the input and cross-coupling transistors enhance the common mode rejection and power supply rejection ratios of the amplifier while retaining a low high-frequency noise figure similar to low-input impedance balanced amplifier designs.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: July 29, 2014
    Assignee: LSI Corporation
    Inventors: Michael Straub, Andrew P. Krebs
  • Patent number: 8760790
    Abstract: Amplifier architectures are provided for current sensing applications. An amplifier includes a load device, an operational amplifier, a current source, and a bipolar transistor. The operational amplifier has a first input terminal connected to a first input node that receives an input current, and a second input terminal connected to a second input node that receives a reference voltage. The current source is connected to an output of the operational amplifier. The operational amplifier, the current source, and the bipolar transistor form a feedback loop that generates and maintains a bias voltage on the first input node based on the reference voltage applied to the second input node. The bipolar transistor amplifies the input current received on the first input node, and generates an amplified input current. The load device converts the amplified input current to an output voltage, wherein the output voltage is used to sense the input current.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: June 24, 2014
    Assignee: LSI Corporation
    Inventors: Brad A. Natzke, Cameron C. Rabe, Hong Jiang, Andrew P. Krebs, Jason P. Brenden
  • Patent number: 8698554
    Abstract: An apparatus comprising an input circuit, a cross coupled active circuit and an output circuit. The input circuit may be configured to generate a first portion of an intermediate signal in response to an input signal. The cross coupled active circuit may be configured to generate a second portion of the intermediate signal in response to a feedback of an output signal. The output circuit may be configured to generate the output signal in response to the intermediate signal. The output signal may pass frequencies above a target frequency.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: April 15, 2014
    Assignee: LSI Corporation
    Inventor: Andrew P. Krebs
  • Publication number: 20130235487
    Abstract: Amplifier architectures are provided for current sensing applications. An amplifier includes a load device, an operational amplifier, a current source, and a bipolar transistor. The operational amplifier has a first input terminal connected to a first input node that receives an input current, and a second input terminal connected to a second input node that receives a reference voltage. The current source is connected to an output of the operational amplifier. The operational amplifier, the current source, and the bipolar transistor form a feedback loop that generates and maintains a bias voltage on the first input node based on the reference voltage applied to the second input node. The bipolar transistor amplifies the input current received on the first input node, and generates an amplified input current. The load device converts the amplified input current to an output voltage, wherein the output voltage is used to sense the input current.
    Type: Application
    Filed: November 12, 2012
    Publication date: September 12, 2013
    Applicant: LSI Corporation
    Inventors: Brad A. Natzke, Cameron C. Rabe, Hong Jiang, Andrew P. Krebs, Jason P. Brenden
  • Publication number: 20130154726
    Abstract: An apparatus comprising an input circuit, a cross coupled active circuit and an output circuit. The input circuit may be configured to generate a first portion of an intermediate signal in response to an input signal. The cross coupled active circuit may be configured to generate a second portion of the intermediate signal in response to a feedback of an output signal. The output circuit may be configured to generate the output signal in response to the intermediate signal. The output signal may pass frequencies above a target frequency.
    Type: Application
    Filed: December 15, 2011
    Publication date: June 20, 2013
    Inventor: Andrew P. Krebs