Low dropout voltage reference
US6198266A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1999 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Oct 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/575
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A low dropout voltage reference having three gain stages and two feedback loops, an overall loop and a secondary loop, is disclosed. The overall feedback loop establishes a desired output voltage. The secondary feedback loop provides two benefits: (1) a broadband reduction of the output impedance to ensure stability under various loading conditions and (2) an improvement in power supply rejection. The first benefit ensures that the pole created by the load capacitance and the output impedance of the amplifier doesn't adversely affect the overall loop stability. The second benefit helps improve line regulation. The low dropout voltage reference does not rely on a capacitor connected to the output to properly compensate the overall feedback loop. Therefore, the reference will work properly for a wide range of load capacitance values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.