Adaptive biasing concept for current mode voltage regulators
US7166991B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 2004 |
| Grant date | Jan 23, 2007 |
| Priority date | — |
| Expiry date | Aug 3, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/575
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Circuits and methods to achieve dynamic biasing for the complete loop transfer function of a current mode voltage regulator have been achieved. The circuit comprises a Mirror-Transconductor Amplifier type operational transconductance amplifier (OTA) wherein its transconductance is linearly dependent on its biasing current. This biasing current is a linearly derivative of the OTA's output current. A current amplification circuit couples the regulator output current linearly with said OTA's output current. In this configuration the iterative biasing of the OTA forms a feed-forward loop, which contains a low-pass filter for stability and a negative feedback loop is closed by connecting the regulator voltage output to the OTA input. The invention realizes a purely current mode regulator since all internal currents are generated as a fraction of the output load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.