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. 01, 1992
Filed:
Mar. 02, 1992
Tran Thong, Beaverton, OR (US);
Tektronix, Inc., Wilsonville, OR (US);
Abstract
A direct digital synthesizer (DDS) for generating an output periodic waveform from a stored digital waveform has a linear feedback shift register coonfigured as a counter. The linear feedback shift register is clocked by the internal reference clock of the DDS, and a predetermined output of the linear feedback shift register is detected to provide a control signal. The control signal causes the frequency or phase of the output waveform to be changed according to control parameters input to a control logic circuit. The control logic circuit preloads the new parameter vlaues into appropriate frequency/phase registers which are switched to the input of the accumulator in the DDS on the next cycle of the reference clock when the control signal is detected.