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:
May. 30, 1995
Filed:
Dec. 13, 1993
James R Lundberg, Austin, TX (US);
Charles E Nuckolls, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus for implementing a constant gain in a digitally-controlled variable oscillator (DCO) 16 where the frequency of the DCO 16 is controlled via binary-weighted control signals. The frequency of the DCO 16 is modulated via arithmetic increments or decrements to the binary-weighted DCO control signals. The magnitude of the arithmetic increments and decrements defines the gain of the DCO. To maintain a constant gain, regardless of operating point or environment, a phase gain register 15 bit-shifts a current DCO control value by a predefined number of bit positions, thereby determining a phase gain value. The phase gain value defines the magnitude of an arithmetic increment or decrement of the current DCO control value, used to determine the next DCO control value. Since the phase gain register 15 uses a bit-shifted version of the current value of the DCO control, the gain value dynamically tracks all updates to the DCO control value, thereby implementing a constant gain in the DCO 16.