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:
Jun. 03, 2014
Filed:
Apr. 24, 2012
Brian Abernethy, Escondido, CA (US);
Brian Abernethy, Escondido, CA (US);
Applied Micro Circuits Corporation, Sunnyvale, CA (US);
Abstract
A method and device are disclosed for providing an ultra low-noise hand gap voltage reference. The method detects a first voltage drop across a first diode reference, and a second voltage drop across a second voltage reference that includes a second diode. The first and second voltage drops are compared. Temperature compensation currents are supplied to the first diode reference and second voltage references in addition to constant currents, where the constant currents have the same value across a first temperature range. As a result of the constant current, a minimal amount of temperature compensation current is required. Alternatively stated, temperature compensation current is provided having a rate of change greater than PTAT. In response to comparing the first voltage drop to the second voltage drop, a true sub-volt hand gap voltage is supplied across a third voltage reference including a diode, that is constant across the first temperature range.