Patents by Inventor Kenneth J. Carroll

Kenneth J. Carroll 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).

  • Implantable cardiac defibrillator employing a switched capacitor gain/filter stage having a transient-free gain change
    Patent number: 4967747
    Abstract: An implantable cardiac defibrillator includes electrodes coupled to a patient's heart, sensing circuitry having inputs connected to the electrodes for sensing cardiac electrical signals, charging means for storing a charge, and discharge means for delivering a shock to the heart. The sensing circuitry includes switched capacitor gain/filter means for providing an output signal which is transient-free during a gain change operation and which maintains a constant filter bandwidth for each gain setting.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: November 6, 1990
    Assignee: Ventritex, Inc.
    Inventors: Kenneth J. Carroll, Benjamin D. Pless
  • Implantable cardiac defibrillator employing a switched capacitor stage having a non-50/50 duty cycle
    Patent number: 4964406
    Abstract: An implantable cardiac defibrillator employing a switched capacitor stage wherein the switches are clocked in a non-50%/50% ratio such that an operational amplifier has greater than 50% of the clock period to acquire the desired voltage and less than 50% of the clock period to hold the acquired voltage, thereby allowing the circuit to run at an overall lower current drain.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: October 23, 1990
    Assignee: Ventritex, Inc.
    Inventors: Kenneth J. Carroll, Benjamin D. Pless
  • Operational transconductance amplifier with improved current source capability
    Patent number: 4897612
    Abstract: A two-stage, operational transconductance amplifier is provided with a rail-to-rail output swing, zero systematic offset voltage and very low quiescent current, but with the ability to both source and sink substantially greater than the output stage quiescent current to a load during transients. The amplifier has found particular application as part of a switched capacitor gain and filtering block in an implantable defibrillator, but is widely applicable.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: January 30, 1990
    Assignee: National Semiconductor Corporation
    Inventor: Kenneth J. Carroll