《ADC与DAC动态性能测试课件》由会员分享，可在线阅读，更多相关《ADC与DAC动态性能测试课件（22页珍藏版）》请在金锄头文库上搜索。
1、ADC与DAC 衡量指标：衡量指标：静态指标：DNL,INL;动态指标：SNR,SINAD,THD,ENOB,IMD,etc.动态指标（1）静态指标反映的特点有限，主要是慢速变化特性，也称之为DC传输特性，对于高速D/A,A/D来说，更需要AC传输特性来表征，反映不同频率信号的响应。主要反映了D/A,A/D器件的高速工作情况下的性能，诸如，VEDIODAC,TXDAC，TXADC等，动态指标（2）SNR:SignaltoNoiseRatioSINAD:SignaltoNoiseAndDistortionRatioTHD:TotalHarmonicDistortionENOB:Effective
2、NumberOfBitsSFDR:Spurious-FreeDynamicRangeTwo-toneIMD.FrequencyDomainAnalysisFt(M)FrequencyMagnitudeSH2H3H4H5NoiseHarmonicsFundamentalSignalSpurious动态特性的测试方法（1）对于DAC来说，相对简单一些，通过编程产生单频信号，然后将输出的信号发送到频谱分析仪。动态特性的测试方法（2）DUT(ADC)AnalogSourceDigitalCaptureDataProcessing(FFT)SinusoidalWaveFrequencySpectrumn
3、bitsClockSourceRXADC测试环境要求（1）Inputsignalrequests：1：Qualityofsignal：SNR,THD.2：Amplitude,frequencyandcommonvoltageofsignal.3：fourorthogonaldifferentialsignals；RXADC测试环境要求（2）Howtoselectsamplenumbers-coherentsamplingFin/Fsample=Ncycle/Nrecord,Fin:PeriodicinputsignalFsample:SamplingfrequencyoftheADCNcycl
4、e:IntegernumberofcycleswithinthesamplingwindowNrecord:NumberofdatapointsinthesamplingwindoworFFTCoherentsamplingUncoherentsamplingWindowingRXADC测试环境要求（3）在rxadc的测试中，Fin=Ncycle*Fsample/NrecordFin (kHz)Fsamp (kHz)NrecordNcycle10.3819270.8336002340.1736270.8336008960.0347270.833600133RXADC测试环境要求（4）Spect
5、ralleakagesamplesequencenotmeetscoherentsamplingWindowingminimizesspectralleakageWindowfunctionWindowtypes:Rectangular,Hamming,Hanning,BlackmanHowtoselectwindowfunction:1:-3dBbandwidth;2:-6dBbandwidth3:maximumside-lobelevel4:side-loberoll-offrateBlackmanwindows-singletonetestWindowsfunctionWindowsfu
6、nctionCalculation(1):FFTPs=sumPf(m-k):1:Pf(m+k);Pdc=sumPf(1:k);Ph=sumPh(2:n);Ph(i)=sumPh(i-1:i+1);Pn=sum(Pf)-Ps-PdcPh;Signalbin的选择：Calculation(2):FFTS/N=10*log(Ps/Pn);SINAD=10*logPs/(Pn+Ph);THD=10*log(Ph/Ps);SFDR=10*logPs/Pmax.spuriousLevel；ENOB=(SINAD-1.763)/6.02SignalbinS/N=10*log(Ps/Pn);=S/N=10*logPs(1+)/Pn(1-10%)=10*log10/9+log(Ps/Pn)=0.46+S/NI/QmatchAnidealsinusoidalI/Qsignalpair:y(t)=Aexp(i(t+)=Acos(t+)+iAsin(t+)I/QmismatchAmplitudemismatchandphasemismatch:y(t)=Acos(t+)+iAsin(t+)=0.5(1+exp(i)Aexp(i(t+)+0.5(1-exp(-i)Aexp(-i(t+)I/QmismatchcalculationAmplitude=20log(Iamp/Qamp);
