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:
Dec. 10, 1996
Filed:
May. 13, 1994
Thomas F Knight, Jr, Belmont, MA (US);
William K Stewart, Lexington, MA (US);
Edward C Parish, North Reading, MA (US);
Jon P Wade, Wellesley, MA (US);
Thinking Machines Corporation, Bedford, MA (US);
Abstract
A resistor circuit includes a resistance control circuit and at least one insulated gate field effect transistor. The resistance control circuit includes a control signal output element including a reference transistor for generating a resistance control signal in response to an internal control signal to maintain the reference transistor at a selected resistance value and a resistance value control element including a reference resistor for generating a circuit control signal for controlling the resistance value of the reference transistor in relation to the resistance value provided by the reference resistor. The field effect transistor is controlled by the resistance control signal to provide a resistance value which is a function of the resistance value of the reference transistor (and therefore of the reference resistor) and ratios of selected physical characteristics of the reference transistor.