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:
Mar. 15, 2016
Filed:
Feb. 01, 2013
Analog Devices, Inc., Norwood, MA (US);
Arthur J. Kalb, Santa Clara, CA (US);
John Sawa Shafran, San Jose, CA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A voltage reference circuit comprises a plurality of ΔVcells, each comprising four bipolar junction transistors (BJTs) connected in a cross-quad configuration and arranged to generate a ΔVvoltage. The plurality of ΔVcells are stacked such that their ΔVvoltages are summed. A last stage is coupled to the summed ΔVvoltages and arranged to generate one or more Vvoltages which are summed with the ΔVvoltages to provide a reference voltage. This arrangement serves to cancel out first-order noise and mismatch associated with the two current sources present in each ΔVcell, such that the voltage reference circuit provides ultra-low 1/f noise in the bandgap voltage output.