David E Chapman

US Patent:

7861200, Dec 28, 2010

Filed:

Mar 24, 2008

Appl. No.:

12/054015

Inventors:

Yifeng Yang - Chandler AZ, US
Yun Zhang - Gilbert AZ, US
Yibin Xia - Gilbert AZ, US
David J. Chapman - Mesa AZ, US

Assignee:

Freescale Semiconductor, Inc. - Austin TX

International Classification:

G06F 17/50

US Classification:

716 6, 716 1, 716 4, 716 5, 716 8, 703 13, 703 14, 703 15

Abstract:

A method of characterizing a device under test (DUT) includes determining a goal function associated with a setup and hold time for the DUT. A minimum value for the goal function is determined by iteratively adjusting setup and hold times for input data to the DUT, and determining whether the DUT performs according to specifications. The minimum goal function value will reflect minimum setup and hold time values based on weights associated with the goal function. This allows the minimum setup and hold times for the DUT to be characterized with a small number of binary searches, improving the speed of the characterization process.

US Patent:

45642125, Jan 14, 1986

Filed:

Dec 12, 1983

Appl. No.:

6/560145

Inventors:

Michael J. Orlandino - Boulder CO
David M. Chapman - Denver CO

International Classification:

B62B 706

US Classification:

280642

Abstract:

This baby stroller utilizes an inexpensive, lightweight, portable, strong, foldable frame, for use in supporting a central seat portion. The frame assembly includes two pairs of transversely connected sidewall elements comprised of two overlapped cross-struts which are pivotally connected to one another, and which can be releasably secured into a stable, rigid X configuration by the use of a simple, inexpensive, one-piece latching brace. The latching brace is fixedly secured to one cross-strut at a distance from its pivotal connection to the other cross-strut, while the non-secured portion of each latching brace is designed to make a releasable, latching connection to and with the other cross-strut. When the latching brace is latched to the cross-strut to which it is not connected, each pair of cross-struts and their associated latching brace form a stable, rigid triangle. This three-piece triangular structure is easily releasable to a pivotable, foldable configuration.