Operating environment and process position selected charge-pump operating mode in an audio power amplifier integrated circuit
US7808324B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2009 |
| Grant date | Oct 5, 2010 |
| Priority date | — |
| Expiry date | Apr 1, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/468
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A charge pump power supply for an audio power amplifier integrated circuit has an operating mode selected according to an indication of operating environment and/or a process position of the integrated circuit. The operating mode selects the output voltage provided by the charge pump and may also select efficiency by selecting a frequency of operation of the charge pump and/or the effective size of a switching transistor bank. The selection is made in conformity with an indication of a process position of the integrated circuit and/or an indication of an environment of the integrated circuit, such as temperature, power supply voltage and/or load impedance values, and generally also in conformity with a volume (gain) setting, or a detected signal level, so that internal power consumption of the amplifier and charge pump is reduced when a high signal level is not being reproduced at the audio power stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.