Scott W Vernon, 464825 Tumbleweed Ave, El Paso, TX 79924

6549072, Apr 15, 2003

Jan 16, 2002

10/052035

Scott D. Vernon - Chandler AZ

Medtronic, Inc. - Minneapolis MN

H03F 345

330252, 330257, 330292, 327307, 381120, 323315

A low-power operational amplifier comprises a differential input-stage and an output stage. The differential input-stage includes first and second differentially coupled input transistors each having base, emitter, and collector electrodes. A first current mirror circuit is coupled to the first and second input transistors and produces a first current which perturbs the current flowing through the first input transistor. The output stage is coupled to the differential input-stage and to the current mirror circuit and produces a second larger current which perturbs the current flowing through the second input transistor. The ratio of the emitter areas of the first and second input transistors are selected to substantially eliminate offset voltage caused by the difference between the first and second perturbing currents. This device is especially suited for low-power Class A bipolar operational amplifiers such as the type employed in low-power medical devices.

6908535, Jun 21, 2005

Mar 6, 2002

10/093012

Samuel P. Rankin - Phoenix AZ, US
Scott D. Vernon - Chandler AZ, US

Medtronic, Inc. - Minneapolis MN

G01N027/327
H03F003/45

204406, 20440314, 330 69

An integrated current-to-voltage conversion circuit converts a first current to an output voltage representative of the first current. The circuit includes a first contact pad and second and third contact pads capable of being coupled across a first resistor. A first operational amplifier has a first input coupled to the first contact pad for producing a first voltage thereat, a second input for receiving a reference voltage, and a first output coupled to the third contact pad. A second voltage appears at the third contact pad. A second operational amplifier has a second output at which a third voltage appears, a first input coupled to the second output, and a second input coupled to the second contact pad. The output voltage is substantially equal to the difference between the second and third voltages.

7715911, May 11, 2010

May 31, 2005

11/141975

Scott D. Vernon - Chandler AZ, US
Larry E. Tyler - Mesa AZ, US

Medtronic, Inc. - Minneapolis MN

A61N 1/02

607 2

Delivering electrical stimulation to a body tissue by a circuit. The circuit includes a first and second terminal electrically coupled to body tissue. A sole capacitor has a first electrode and a second electrode. The first electrode is coupled to the first terminal. The second electrode is coupled to a power source through a switch.

7852052, Dec 14, 2010

Feb 28, 2006

11/363770

Scott D. Vernon - Chandler AZ, US

Medtronic, Inc. - Minneapolis MN

G05F 1/00
H02J 3/46
A61N 1/00

323269, 307 24, 607 4

A supply circuit for an implantable medical device (IMD) is presented. The supply circuit includes a battery, a high current circuit, a current-modifying component, a low current circuit, and a capacitor. The low current circuit is connected to a first terminal of the battery. A current-modifying component is connected to the battery, a capacitor, and to a high current circuit.

8290583, Oct 16, 2012

Apr 23, 2010

12/766144

Scott D. Vernon - Chandler AZ, US
Larry E. Tyler - Mesa AZ, US

Medtronic, Inc. - Minneapolis MN

A61N 1/02

607 2

Delivering electrical stimulation to a body tissue by a circuit. The circuit includes a first and second terminal electrically coupled to body tissue. A sole capacitor has a first electrode and a second electrode. The first electrode is coupled to the first terminal. The second electrode is coupled to a power source through a switch.

8649526, Feb 11, 2014

Sep 3, 2010

12/875871

Scott Dennis Vernon - Chandler AZ, US

NXP B.V. - Eindhoven

A61F 11/06

381 716, 381 711

Noise cancellation is effected for audio devices. In connection with various embodiments, a forward leakage transfer function is determined using a signal corresponding to detected portions of the generated sound that has leaked out of the user's ear canal with the proximate end of the earphone inserted in (or otherwise fitted to) the ear. This forward leakage transfer function can be used to characterize ambient noise entering a user's ear canal. A signal corresponding to ambient noise is processed with the forward leakage transfer function to generate and output a noise-cancelling signal for canceling at least a portion of the detected ambient noise.

6268725, Jul 31, 2001

Apr 29, 1998

9/069472

Scott D. Vernon - Chandler AZ
Larry E. Tyler - Mesa AZ

Medtronic, Inc. - Minneapolis MN

G01R 3304

324253

A flux-gate magnetometer having a drive signal for reducing the effects of electromagnetic interference (EMI) is provided. The drive signal has a characteristic that varies over time. For example, the drive signal may include a duty cycle that varies over time, the frequency of the drive signal may be varied over time, or the phase shift of the drive signal may vary over time.