发明名称 |
A sigma-delta modulator for increased volume resolution in audio output stages |
摘要 |
A variable gain analog amplifier is described that uses pulse-density modulation in the form of a sigma-delta modulator (SDM) to produce a gain by modulating the selection of a switch that selects the amount of resistance in a negative feedback loop of the amplifier. The output of the SDM is dithered to increase the gain resolution of the analog amplifier, wherein the increased resolution produces a quiet, inaudible transition between changes in gain setting at an output of the variable gain amplifier and in addition produces a quiet, inaudible mixing and merging of audio signals. |
申请公布号 |
EP2592751(A1) |
申请公布日期 |
2013.05.15 |
申请号 |
EP20110368026 |
申请日期 |
2011.11.14 |
申请人 |
DIALOG SEMICONDUCTOR GMBH |
发明人 |
LOEDA, SEBASTIEN;TERRY, ANDREW |
分类号 |
H03G1/00;H03G3/00 |
主分类号 |
H03G1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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