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:
Jan. 07, 1992
Filed:
Nov. 05, 1990
Jeffrey P Kotowski, Rolling Meadows, IL (US);
Brian Chapman, Gurnee, IL (US);
Kevin M Andrews, Kenosha, WI (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus is disclosed for measuring and/or controlling the level of current in a Sense FET which includes a power transistor (M1) and a sense transistor (M2). The transistors (M1) and (M2) are both biased to operate in a linear mode, and the Vds of the sense transistor (M2) is compared to a predetermined fraction of the Vds of the power transistor (M1). A control signal is generated that is representative of the results of the comparison, and, in one embodiment, that control signal is used in a feedback arrangement to drive the Vds of the sense transistor (M2) to the predetermined fraction of the Vds of the power transistor (M1). Consequently, the level of current carried by the sense transistor (M2) is caused to be equal to the same predetermined fraction of the current carried by the power transistor (M1).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile