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:
Jul. 07, 1987
Filed:
Jul. 19, 1985
John G Hogeboom, Nepean, CA;
Terence N Thomas, Nepean, CA;
Northern Telecom Limited, Montreal, CA;
Abstract
A stream of high-speed bipolar signals transmitted along standard twisted pair telephone wiring are detected by a circuit that includes a pair of differential amplifiers each having a signal input connected directly to one conductor of the twisted pair and a reference input connected through a peak voltage detector to the opposite conductor. The amplifiers function as an input signal comparator which generates a corresponding bit stream of logical ones in response to the bipolar signals that exceed 50% of the average peak voltage input. A threshold bias voltage corresponding to positive going signals on each conductor is generated by the detector and charges separate capacitors that connect each reference input to its conductor. The bias voltage and bipolar signals input to each amplifier are algebraically summed which doubles the differential input signal and results in an increased signal to noise ratio of about six decibels.