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:
Nov. 19, 1985
Filed:
Dec. 07, 1983
Applicant:
Inventor:
Yusuf A Haque, San Jose, CA (US);
Assignee:
American Microsystems, Incorporated, Santa Clara, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
329101 ; 324 / ; 329126 ; 329166 ; 329192 ; 329132 ; 455229 ; 455234 ;
Abstract
A carrier detection circuit includes a rectification stage, an integrator, a comparator, and a digital counter. By utilizing a digital counter, long time constants are provided without the use of external components. If desired, a mark detect circuit is used when a mark must be present to signify the presence of carrier. Hysteresis is provided by the comparator to insure that slight fluctuations in the carrier level do not affect the comparison.