Unconditional frequency compensation technique on-chip low dropout voltage regulator
US8324876B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2008 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Feb 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/575
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A low dropout (LDO) voltage regulator with unconditional frequency compensation is presented. The low dropout voltage regulator is implemented using a two-stage operational amplifier. The first stage amplifier has two input transistors, each of which is connected to a diode-connected transistor. A transistor is connected in parallel to the diode-connected transistors to increase the gain of the first stage amplifier. The LDO voltage regulator has a compensation capacitance input between the first stage amplifier and the second stage amplifier and a voltage on the compensation capacitance input adjusts the current through the diode-connected transistors, as well as the gain of the first stage amplifier. The second stage amplifier receives output from the first stage amplifier, and a compensation capacitor is connected between the compensation capacitance input of the operational amplifier and the output node of the LDO voltage regulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.