Anthony Walter Taylor

US Patent:

20020093356, Jul 18, 2002

Filed:

Nov 30, 2000

Appl. No.:

09/728022

Inventors:

Thomas Williams - Boulder CO, US
Rohit Kapur - Cupertino CA, US
Anthony Taylor - Mountain View CA, US

International Classification:

G01R031/26

US Classification:

324/765000

Abstract:

A method and circuit for testing an integrated circuit device using intelligent test vector formatting that reduces the storage required for test patterns and also provides encryption of the test patterns. A first memory stores a test vector mask that is a sequence of bits to indicate if corresponding test vector data is deterministic or random. The test vector data contains a portion that is deterministically generated by automatic test pattern generation (ATPG) software and a portion that is random. A second memory contains a sequence of bits that represent the deterministic test vector data. A random number generator (e.g., linear feed-back shift register, LFSR) generates a reproducible sequence of pseudo random bits that is based on a seed value. A selector circuit is used to select bits either from the second memory or from the random number generator based on the value of the mask vector. The output of the selector provides a fully specified test vector for application to the device under test (DUT). The LFSR can be fabricated on the DUT. The output of the DUT can be coupled back to stages of the LFSR. The bits of the mask vector can readily be compressed thereby saving memory. Neither the first or second memory need to store the random bits because these bits are reproduced on-the-fly by the LFSR, viewed as a compressed data repository. The system provides encryption protection for the test vectors because the LFSR requires the proper seed value before generating the proper sequence of pseudo random bits.

US Patent:

20070152102, Jul 5, 2007

Filed:

Jan 4, 2006

Appl. No.:

11/324241

Inventors:

William Gargano - Boulder CO, US
Robert Sinclair - Costa Mesa CA, US
Anthony Taylor - Huntington Beach CA, US

International Classification:

B64D 17/02

US Classification:

244145000

Abstract:

A parachute having radial slots distributed at regular intervals around the shoulder region to effect boundary flow separation, causing Von Karmen Vortex Street shed vortices to separate in a symmetrical manner from the inflated shape and resulting in an extremely stable aerodynamic decelerator. In addition, pressure vents in the crown region vent high pressure air during the inflation process to contribute to opening load control. Once the parachute is fully inflated, the pressure vents provide energetic airflow that ensures that the shed vortices created by the radial slots do not re-contact the canopy and cause instability.