【通俗易懂】浅谈Delta-Sigma之工作原理

1Delta-Sigma/95EAD-DSPDSP(227)CrystalCS4328CS4330ICOverSamplingD/AConverterICICUpSampleDSP-D/AConverterEAD-DSPDSP--()OverSamplingCS4328DataSheetDelta-Sigma()CS43288XInterpolationFilterDelta-Sigma()-D/AconverterCS43282K1BitDACXdXd18bitddigitalYd1Bit11YdXdYd(Zd)XdYd1YdZdXdYd1XdZdUd=Xd-ZdUd(Yd)1Ud1YdYdZdXdZd1BitDACYdYa(aanalog)YaZaZaZdZdZa1BitDACZaXaXaXd3Xd(a)Zd()1Bit((a))(b)XdXdYdDACXdXd(a)(SigmaDeltaModulator)4UdXdYdXdYdUd(Delta-SigmaModulator)nnS/Nn=5CS43281bitDAC(a)1Bit(b)(b)(a)l0(a)1Bit130(a)1Bit145(b)1Bit15CS4328()()1Bit(audio)(20KHz)Yd20KHz50KHz()S/N16bitDAC1bitnS/NCS432867DigitalCS4328CS4328SwitchedCapacitorFilterSwitchedCapacitor01Delta-SigmaDelta-Sigma