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:
Aug. 06, 2002
Filed:
Jul. 19, 2001
Semtech Corporation, Newbury Park, CA (US);
Abstract
A clock output controller using a digital frequency synthesis minimizes the clock output disturbance due to input reference signal switchover. The controller includes a first and a second accumulator where the Most Significant Bit (MSB) of the first accumulator output generates the clock output signal and the MSB of the second accumulator generates a feedback signal. A reset control signal is generated by the transition edge detector/switchover controller and it is coupled to the register block of the second accumulator in order to reset the feedback signal at an appropriate time so as to match the phase of the new reference signal. A hold control signal is also generated to keep the clock output locked on the old reference signal until the feedback signal is locked to the new signal. The hold signal is then reset once locking to the new reference signal is accomplished and the clock output is fully switched over with minimal disturbance.