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:
Oct. 29, 2002
Filed:
Dec. 28, 1998
John L. Wallberg, Dallas, TX (US);
Shawn A. Fahrenbruch, Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A circuit is designed with a register circuit ( ) arranged to store a control word. A voltage-controlled oscillator ( ) is coupled to receive the control word ( ) and produce a clock signal ( ) having a current frequency corresponding to the control word. A phase detector circuit ( ) is coupled to receive a reference signal ( ) and the clock signal. The clock signal has one of a phase lead and a phase lag with respect to the reference signal. The phase detector circuit produces a phase signal ( ) having a first state in response to the phase lead and having a second state in response to the phase lag. An estimate circuit ( ) is coupled to the register circuit and the phase detector circuit. The estimate circuit produces a next control word ( ) corresponding to a next frequency intermediate the current frequency and a frequency corresponding to a transition between the first and second states.