Method for providing and operating an LDO
US8513929B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 2010 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Nov 30, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/575
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The LDO has at least three stages supplied by a supply voltage. A first stage has a differential amplifier and a folded cascode device with a regulated current mirror. The LDO has two nodes that are configured to couple the differential amplifier and the regulated current mirror and to receive a differential signal, respectively. The regulated current mirror is configured to convert and amplify the differential signals to a single ended signal. Said LDO has a first capacitor configured for frequency compensation, said first capacitor coupled between said first stage and a second stage. The LDO has a second capacitor for balancing capacitive loading of a first cascode circuit, said second capacitor coupled between said first stage and said supply voltage. Said first cascode circuit is configured to suppress different voltages between input and output of the capacitors caused of a modulation of said supply voltage. The LDO has a second cascode circuit configured to suppress supply modulations of the differential amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.