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:
Sep. 20, 2016
Filed:
Sep. 25, 2015
Raytheon Company, Waltham, MA (US);
Michael G. Hawkins, Plano, TX (US);
David D. Heston, Dallas, TX (US);
Raytheon Company, Waltham, MA (US);
Abstract
A bias circuit includes second order process variation compensation in a current source topology having a compensation transistor operating in saturation mode as a current source. An additional compensation transistor is biased to operate in a linear mode to provide an active resistor to vary a control voltage applied to the saturation mode compensation transistor and widen the range of sourced control current, thus widening the achievable range of the control voltage applied to the biasing transistor to produce a predetermined level of bias current despite process variations. The additional compensation transistor has been shown to be able to compensate for another approximately 20-25% of the induced variations leaving less than approximately 10% and preferably less than 5% variation in the bias current from the predetermined level at certain bias conditions and over typical fabrication process variations.