destruction
记⼀下ADC⼀些关键指标的计算
记之备忘。make friends
jdz⼀、Effective resolution: 有效分辨率
Effective resolution = Log2(VIN / Vrms-noi)
底数为2
听歌
VIN：输⼊范围，与ADC的PGA设置有关。例如⼀个24位ADC，PGA=128，2.5V基准电压。 那么VIN = ±Vref/PGA=(±2.5V/128) = 39.06mV四级翻译
如果PGA=1，则VIN = 5V
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Vrms-noi：rms噪声
⼆、Noi-free resolution: ⽆噪声分辨率
Noi-free resolution = Log2(VIN / Vp-p-noi) = Log2(VIN / 6.6* Vrms-noi) = Effective resolution - 2.7
这⾥取峰值因数C = 6.6 = Vp-p-noi / Vrms-noi
三、ENOB(Effective number of bits)： 有效位数，注意与有效分辨率不是⼀个概念
kiddie
ENOB = Log2[VIN / (Vrms-noi * √12)] ≈ (SINAD-1.76) / 6.02
四、SINAD（Singal to Noi and Distortion ratio) ： 信纳⽐
triggerpoint>小学新标准英语
SINAD is defined as the ratio of the total signal power level(wanted Singal + Noi + Distortion or SND) to unwanted signal power(Noi + Distortion or ND)
>曹刿论战翻译
