The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 2001
Filed:
Oct. 13, 1999
Mehran Aliahmad, Ottawa, CA;
Russell W. Brown, Nepean, CA;
Quantum Corporation, Milpitas, CA (US);
Abstract
A phase difference to duty-cycle circuit converts a phase shifted signal and a reference signal into a single signal having a duty cycle that is a function of the phase difference between the two signals. The single signal may be further converted to a single direct current (DC) value before being transmitted to external measurement circuitry. The external measurement circuitry, by simply measuring the magnitude of the DC signal, can determine the phase difference between the phase shifted signal and the reference signal. In an alternate embodiment, the phase shift in the target bit of a bit pattern is determined based on measurements of the DC voltage value of the shifted target bit pattern, the DC voltage value of first bit pattern comprising a non-shifted bit pattern representing a zero phase shift of the target bit, and a DC voltage value of a bit pattern comprising a non-shifted bit pattern representing a 100% phase shift of the target bit.