Low-noise current-in class D amplifier with slew rate control mechanism
US10063251B2 · kind B2 · utility
2Cited by
8References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2017 |
| Grant date | Aug 28, 2018 |
| Priority date | — |
| Expiry date | Jun 22, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45238
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit applied to speaker includes a tri-level current DAC and a class D amplifier. The current DAC is arranged to receive a digital signal to generate a current signal, and the class D amplifier is arranged to directly receive the current from the current DAC and to amplify the current signal to generate an output signal. SNR performance is well improved class D amplifier due to small signal noise reduced by preceding tri-level DAC. In addition, the circuit further includes a driving stage, and a gate-drain voltage of a power transistor within the driving stage can be controlled to set the appropriate slew rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.