Patents by Inventor Matthew Nathan Duff

Matthew Nathan Duff 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).

  • Apparatus and method for amplification with high front-end gain in the presence of large DC offsets
    Patent number: 8390374
    Abstract: Apparatus and methods reduce the likelihood of amplifier saturation due to propagated DC offsets, and reduce the recover from saturated stated when such saturation occurs. Advantageously, these attributes are beneficial for monitoring of bioelectric signals. A circuit uses an instrumentation amplifier connected as a high pass filter to attenuate large DC offsets and amplify small signals. The circuit can include an instrumentation amplifier electrically coupled with a first feedback circuit including at least one resistor and a second feedback circuit including an op-amp. The feedback circuit can also include a low-pass filter. The op-amp in the second feedback circuit can be configured as a non-inverting amplifier, an inverting amplifier, and/or an integrator circuit. Alternatively, the circuit can include an instrumentation amplifier with one feedback circuit including at least one resistor, and a coupling capacitor electrically coupled with a reference voltage.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: March 5, 2013
    Assignee: Analog Devices, Inc.
    Inventors: Alasdair Gordon Alexander, David James Plourde, Matthew Nathan Duff
  • APPARATUS AND METHOD FOR AMPLIFICATION WITH HIGH FRONT-END GAIN IN THE PRESENCE OF LARGE DC OFFSETS
    Publication number: 20120188009
    Abstract: Apparatus and methods reduce the likelihood of amplifier saturation due to propagated DC offsets, and reduce the recover from saturated stated when such saturation occurs. Advantageously, these attributes are beneficial for monitoring of bioelectric signals. A circuit uses an instrumentation amplifier connected as a high pass filter to attenuate large DC offsets and amplify small signals. The circuit can include an instrumentation amplifier electrically coupled with a first feedback circuit including at least one resistor and a second feedback circuit including an op-amp. The feedback circuit can also include a low-pass filter. The op-amp in the second feedback circuit can be configured as a non-inverting amplifier, an inverting amplifier, and/or an integrator circuit. Alternatively, the circuit can include an instrumentation amplifier with one feedback circuit including at least one resistor, and a coupling capacitor electrically coupled with a reference voltage.
    Type: Application
    Filed: January 25, 2011
    Publication date: July 26, 2012
    Applicant: ANALOG DEVICES, INC.
    Inventors: Alasdair Gordon Alexander, David James Plourde, Matthew Nathan Duff