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:
Apr. 26, 1988
Filed:
May. 27, 1987
Jean-Louis Schevin, Le Rouret, FR;
Pierre M Carbou, Tourrette s/Loup, FR;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A sinusoidal signal generator having a frequency variable as a function of a selection signal applied to the generator. A clock generator (1, 2) is programmable as a function of the selection signal and adapted to provide a plurality of clock signals having variable frequencies. A D/A converter (7) generates from a difference fixed potential (V.sub.ss, V.sub.r), as a function of the clock signals utilized as sampling signals, a step signal having a sinusoidal envelope, of which the fundamental frequency is a function of the selection signal. A low pass filter (10) having transfer function which is dependent on the change in the fundamental frequency of the sinusoidal envelope (as controlled by the clock signals) rejects the harmonics contained in the step signal produced by the convertor (17), and provides a sinusoidal signal having a low harmnonic distortion.