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:
May. 16, 1989
Filed:
Mar. 24, 1988
Applicant:
Inventor:
Natan Baron, Oranti, IL;
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03B / ;
U.S. Cl.
CPC ...
3311 / ; 331109 ; 3311 / ;
Abstract
A crystal oscillator circuit having an accurate duty cycle at very high frequency is provided. An oscillator stage is provided which receives regenerative feedback from an inverter to sustain oscillation. The oscillator stage provides an AC output signal having a first average DC value determined by the regenerative feedback. The AC signal is coupled to a clipping circuit which symmetrically clips the AC signal about a predetermined second average DC level at first and second predetermined voltage levels. The inverter receives the clipped signal and provides an oscillating clock signal with an accurate duty cycle in response thereto.