THOMAS LEE SHEWELL
Engineers in Basket, PA

License number
Pennsylvania PE045570E
Category
Engineers
Type
Professional Engineer
Address
Address
Basket, PA 19547

Professional information

Thomas Shewell Photo 1

Thomas Shewell - Oley, PA

Work:
Dickinson's Residential Service Annex - Carlisle, PA
Computer Technician
Procter & Gamble - Carlisle, PA
Business stagey class consultant
CWM Legal, LLC - Reading, PA
Intern
Beijing Yinghanda English Academy
English Tutor, Beijing, China
Cumberland County Court House - Carlisle, PA
Intern
Education:
Peking University
Chinese
Dickinson College - Carlisle, PA
BA in International Business & Management


Thomas Shewell Photo 2

Methods And Devices For Testing The Operation Of Counters Used In Phase-Locked Loops

US Patent:
6356126, Mar 12, 2002
Filed:
Jul 10, 2000
Appl. No.:
09/612980
Inventors:
David L. Anderson - Kutztown PA
Naresh Gupta - Berwyn PA
Thomas L. Shewell - Oley PA
Thomas F. Strelchun - Mertztown PA
Assignee:
Agere Systems Guardian Corp.
International Classification:
H03L 700
US Classification:
327151, 327154
Abstract:
Intermittent miscounts generated by counters used in a phase-locked loop (“PLL”) are precisely measured by detecting changes to a predetermined waveform, such as a sawtooth waveform. The miscounts are detected using an open loop, not closed loop, set-up which comprises two separate signal generators feeding two separate frequencies into MAIN and REF counters of a PLL. Offsetting the frequencies slightly and integrating an output generates the predetermined waveform. Thereafter, miscounts can be detected by comparing waveforms corresponding to miscounts to theoretically predicted, predetermined waveforms.