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:
Sep. 08, 1992
Filed:
Dec. 03, 1990
Applicant:
Inventors:
Joseph L Whitehead, Decatur, TX (US);
Philip L Dillon, Arlington, TX (US);
Assignee:
Reliance Comm/Tec Corporation, Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375 98 ; 375 76 ; 307359 ;
Abstract
An amplifier for use with low level pulse code modulation (PCM) nonreturn-to-zero (NRZ) signals. The amplifier has a high, but controllable gain and does not have a DC shift at its output as long as there is at least one zero or one one bit in each of frame PCM NRZ signals. The amplifier includes a feedback circuit to control the bias of one of the two stages of amplification when zeroes are being received. The amplifier also includes an AGC circuit which reduces the gain when a high amplitude one is received.