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. 08, 2005
Filed:
Sep. 28, 2001
Wilhelm Leichtfried, Sterling Heights, MI (US);
Charles Mcdowell, Rochester Hills, MI (US);
James Dulgerian, Troy, MI (US);
Wilhelm Leichtfried, Sterling Heights, MI (US);
Charles McDowell, Rochester Hills, MI (US);
James Dulgerian, Troy, MI (US);
Alps Automotive, Inc., Auburn Hills, MI (US);
Abstract
A crystal-less keyless entry system includes a micro controller, a timing circuit, a memory, and a radio frequency circuit. The memory and timing circuit are a unitary part of the microprocessor. The memory is programmed with a compensation that adjusts an output frequency of the timing circuit such that the output frequency of the timing circuit does not coincide with a frequency discontinuity that occurs within an output of the timing circuit. A method of calibrating the crystal-less keyless entry system includes programming the temperature compensation and a voltage compensation in the memory.