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:
Oct. 08, 2002
Filed:
Aug. 17, 2000
Thomas E. McEwan, Carmel Highlands, CA (US);
McEwan Technologies, LLC, Monterey, CA (US);
Abstract
A dither oscillator randomly modulates the instantaneous phase of a precision radar PRF oscillator. Radar spectral emission lines occurring at multiples of a transmit PRF oscillator are spread by the phase modulation, resulting in a continuous noise-like spectrum for reduced interference. The dither oscillator is based on a CMOS logic inverter and has adjustable coherence. The transition times of the PRF clock are decreased to 100 ps using negative resistance in an emitter follower to help injection-lock an RF oscillator to the PRF clock. Applications include spread-spectrum radar sensors operating in the crowded ISM bands, such as robotic and automotive pulse-echo rangefinders.