Current limit circuit for power amplifiers
US7193474B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2004 |
| Grant date | Mar 20, 2007 |
| Priority date | — |
| Expiry date | Dec 21, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/52
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
According to one embodiment of the invention, a circuit arrangement includes a regulator circuit. The circuit arrangement further includes a current limit circuit coupled to the regulator circuit. The circuit arrangement further includes a power amplifier coupled to the regulator circuit, where the power amplifier is configured to draw a first current from the regular circuit. The current limit circuit is configured to decrease the first current when the first current causes a second current in the current limit circuit to be greater than a reference current. According to this embodiment, the second current is a mirror current of the first current. The current limit circuit includes a current sink, where the current sink is configured to sink the reference current to ground. The current limit circuit further includes a feedback loop, where the feedback loop causes the second current to be substantially equal to the reference current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.