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:
Mar. 28, 1989
Filed:
Oct. 08, 1987
Carl R Ryan, Gilbert, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A phase acquisition and tracking apparatus in which a phase difference between a reference signal and a signal to be acquired is rotated within a negative feedback loop so that such phase difference disappears is disclosed. In another embodiment, a baseband signal which is influenced by such a phase difference is rotated within a negative feedback loop so that the phase difference disappears. The phase rotated signal serves as an output signal from the phase acquisition and tracking apparatus, and this output signal faithfully and rapidly reproduces the input signal regardless of any particular value of such phase difference. Since a negative feedback loop is used to control the amount of phase rotation, non-linearities and other errors produced by multipliers, summing devices and combining circuits are automatically compensated for through the feedback.