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:
Jun. 04, 2002
Filed:
Aug. 18, 2000
Yves Leduc, Roquefort-les-Pins, FR;
Pascal Guignon, Callian Fayence, FR;
Pierre Carbou, Tourrettes-sur-Loup, FR;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An oscillator includes a resonator, such as a crystal ( ) coupled to first and second capacitor banks ( ). The first and second capacitor banks ( ) each comprise a plurality of capacitors ( ) coupled to the resonator ( ) through respective switching devices ( ) that may be selectively enabled. The switches ( ) are selectively enabled to couple a desired set of said capacitors ( ) to said resonator ( ). At least one of the switches ( ) is controlled with a clock signal having a programmable duty cycle from a sigma-delta modulator ( ) to enable at least one of said capacitors ( ) during a first phase of the clock signal and disable that capacitor ( ) during a second phase of the clock signal.