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:
Oct. 04, 1983
Filed:
Dec. 28, 1981
Michael B Terry, Denton, TX (US);
Mostek Corporation, Carrollton, TX (US);
Abstract
A current supplementation circuit is designed to operate in conjunction with a two-terminal telephone line for supplying additional current to the output of a voltage regulator (42). A nonregulated voltage is received at first and second terminals (18, 20) with the nonregulated voltage comprising both DC and AC signals. An essentially regulated voltage is produced at a terminal (12) at the output of the voltage regulator (42). An essentially constant current is drawn from the first terminal (41) and provided to the second terminal (20) to provide an indication that the subscriber circuit is active. This constant current comprises first and second partial currents. The first partial current is passed through a control transistor (98) through a parasitic collector to the second terminal (14). The second partial current is passed through the control transistor (98) to the regulated voltage terminal (12) when the voltage at this terminal drops. The current supplementation circuit serves to bypass the voltage regulator (42) and supply additional current to the voltage regulated node when the voltage at that node drops below its intended level.