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:
Nov. 19, 1996
Filed:
Nov. 02, 1995
Barry W Herold, Boca Raton, FL (US);
Scott R Humphreys, Boynton Beach, FL (US);
Phillip Johnson, Lake Worth, FL (US);
Raymond L Barrett, Jr, Ft. Lauderdale, FL (US);
Grazyna A Pajunen, Delray Beach, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A communication receiver (100) employs a discrete time digital phase locked loop (142) for maintaining a generated signal (144) locked to a reference signal (136). The discrete time digital phase locked loop (142) includes a phase detector (202), an accumulator (219), an adder (227), and a controlled oscillator (232). The accumulator (219) is connected to the phase detector (202) and a reference signal (136) for calculating an accumulator output value equal to a first sum of a current sample generated by the phase detector (202), and all of the plurality of discrete phase error samples produced prior to the current sample. The adder (227) is connected to the phase detector (202) and the accumulator (219) for forming a second sum of the current sample and the accumulator output value. The controlled oscillator (232) receives the second sum, which is utilized for controlling the controlled oscillator (232).