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:
May. 20, 2003
Filed:
Nov. 21, 2001
Lorenzo Bedarida, Vimercate, IT;
Luca Vandi, Firenze, IT;
Carlo Lisi, Milan, IT;
Andrea Bellini, Fontevivo, IT;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
An impedance control circuit controls the impedance of an integrated output driving stage. The integrated output driving stage includes at least one enabling/disabling transistor and at least one driving transistor. The impedance control circuit includes a variable impedance circuit having an impedance that varies with the temperature in correlation with the impedance of the output driving stage. A control circuit is connected to the variable impedance circuit for generating at least one enabling/disabling signal for the at least one enabling/disabling transistor based upon a control signal correlated to the impedance of the variable impedance circuit. The impedance control circuit also includes a current generating circuit for applying to the variable impedance circuit a current which remains substantially stable as the temperature varies.