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:
Jan. 18, 2000
Filed:
Dec. 19, 1997
Patrick R Smith, Garland, TX (US);
Kevin M Ovens, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An integrated circuit (100) contains an analog phase-locked loop circuit having a phase detector circuit (16) which compares the phase of a reference signal (28) to the output (12) of the phase-locked loop circuit, a charge pump circuit (18) responsive to the phase detector circuit for varying the charge on a capacitor (36) of a loop filter circuit (20), a regulator circuit (22) which receives two separate control voltages (38, 44) from the loop filter circuit, and a voltage controlled oscillator circuit (24) which receives from the regulator circuit two separate control voltages (VIN, VREG). The voltage controlled oscillator circuit is designed to work with a relatively low regulated voltage, and the regulator circuit is implemented with n-channel devices. The two control voltages respectively effect coarse and fine adjustment of the frequency of the output signal from the phase-locked loop circuit.