LOW-NOISE CURRENT-IN CLASS D AMPLIFIER WITH SLEW RATE CONTROL MECHANISM |
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| 申请号 | US15630942 | 申请日 | 2017-06-22 | 公开(公告)号 | US20180019758A1 | 公开(公告)日 | 2018-01-18 |
| 申请人 | MEDIATEK INC.; | 发明人 | Chuan-Hung Hsiao; Kuan-Ta Chen; | ||||
| 摘要 | 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. | ||||||
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| 说明书全文 | |||||||
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