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. 30, 2007
Filed:
Jun. 29, 2005
Evaldo M. Miranda, Saratoga, CA (US);
A. Paul Brokaw, Tucson, AZ (US);
Evaldo M. Miranda, Saratoga, CA (US);
A. Paul Brokaw, Tucson, AZ (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A switched current temperature sensing circuit comprises a BJT arranged to conduct a forced emitter current Iof the form I+(I/β), such that the base current is given by I/β and the collector current is given by I+(I/β)−(I/β)=I. Base current I/β is mirrored to the emitter, and a current source provides current I, which is switched between at least a first value I and a second value N*I such that the BJT's base-emitter voltage has a first value Vwhen I=I and a second value Vwhen I=N*I, such that:ΔV=V−V=()(ln N),where nis the BJT's emission coefficient, k is Boltzmann's constant, T is absolute temperature, and q is the electron charge.