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. 29, 1988
Filed:
Nov. 17, 1986
Gerald L Somer, Sebastopol, CA (US);
AMP Incorporated, Harrisburg, PA (US);
Abstract
A channel switching oscillator circuit (230) in which the oscillator frequency is selected from one of a predetermined number of frequencies by switching into the oscillator circuit (230) one of a plurality of tank circuits (L4, L5, L6). The tank circuit (L4, L5, L6) is resonant with one of a plurality of crystals (Y2, Y3, Y4) in the oscillator (230) to generate a carrier signal at the predetermined frequency. The crystals (Y2, Y3, Y4) remain in the oscillator circuit (230) with no switching thereof as the frequencies at which the crystals (Y2, Y3, Y4) oscillate are sufficiently far apart, coupled with the high Q of the tank circuit (L4, L5, L6), that only one of the crystals (Y2, Y3, Y4) is resonant with each tank circuit (L4, L5, L6).