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. 03, 1992
Filed:
Feb. 20, 1991
Applicant:
Inventor:
Boubekeur Benhamida, Boise, ID (US);
Assignee:
Zilog, Inc., Campbell, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B / ; H03K / ;
U.S. Cl.
CPC ...
331 59 ; 3311 / ; 331111 ; 331158 ;
Abstract
A circuit has a mask option for choosing between a crystal or an RC oscillator. The RC oscillator is completely fabricated on an integrated-circuit chip and includes a charging path, a discharging path, and a capacitor coupled at a node. The alternating charging and discharging of the node produces the oscillating output voltage signal at certain frequency. The oscillation frequency may be trimmed by coupling a single optional external resistor to either the charging or discharging paths, thereby reducing the output oscillation frequency.