Power supply feed forward analog input filter component mismatch correction
US7436255B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2007 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | Apr 6, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/217
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Systems and methods for minimizing errors due to component variation in switching amplifiers utilizing power supply feed forward techniques. One embodiment comprises a digital PWM amplifier having an amplification subsystem for receiving a digital audio signal and producing an analog output signal. The amplifier includes a power supply feed-forward path configured to modify the digital audio signal based on a power supply measurement. The feed-forward path includes an analog filter configured to filter the power supply measurement, as well as correction circuitry configured to correct component mismatch errors introduced by the filter. The power supply measurement may be a power supply difference, a power supply common mode, or both. In either case, the power supply measurement is corrected by multiplying the measurement by an appropriately scaled power supply difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.