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. 29, 1988
Filed:
Jul. 15, 1987
Roy Y Kinoshita, Anaheim, CA (US);
Patrick E McCollum, Yorba Linda, CA (US);
Rockwell International Corporation, El Segundo, CA (US);
Abstract
An interface circuit having a first reference terminal and a first input terminal for receiving a first input current signal, referenced to said first reference terminal from a first input current signal source. The circuit also has a second reference terminal and a second input terminal for receiving a second input current signal referenced to said second reference terminal from a second input current signal source. The second input current signal has a first and second signal current level. The interface circuit comprises a first receiver means coupled between the first input terminal and a first receiver means reference terminal. The first receiver means is responsive to the first input current signal first and second signal current levels for providing a first output signal at respective first and second levels. The first output signal is referenced to the second reference potential at a first signal output terminal. A second receiver means is coupled between the first receiver reference terminal and the first reference terminal. The second receiver means is responsive to the second input current signal for decreasing and increasing the resistance between the first receiver reference terminal and the first reference terminal to predetermined values. The input resistance between the first receiver reference terminal and the first reference terminal being substantially independent of the first input current signal first and second signal current levels.