Ultra low-noise true sub-volt band gap
US8742746B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2012 |
| Grant date | Jun 3, 2014 |
| Priority date | — |
| Expiry date | Apr 24, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.