Volume control in class D amplifier using variable supply voltage
US7161421B2 · kind B2 · utility
9Cited by
1References
3Claims
0Family size
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Inventor
Key dates
| Filing date | Dec 16, 2004 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Feb 15, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/2171
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A Class D audio amplifier including a gain stabilization feedback loop in which volume control is achieved by varying the bus voltage. Changes in the bus voltage are compensated for by complementary changes in the gain of a compensation element in feedback loop so the signal level at the output of the Class D stage can be adjusted independent of the feedback. A digital attenuator can be employed ahead of the amplifier to shift the effective gain of the amplifier output to provide additional volume control range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.