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6.3. 816.3.5 (Advanced)RMS(1σ) ∆V in (f)[nV/ √ Hz] (6.27)?? AD797 AD797 30kHz ∼ 100kHz 10 ∆V 2out = A ×= 10 ×∫ f1∆Vin(f)df 2(6.28)f 0∫ 100[kHz]30[kHz](0.9[nV/ √ Hz]) 2 df (6.29)= 10 × (100 − 30)[kHz] × 0.81[nV 2 /Hz] = 5.67 × 10 5 [nV 2 ] (6.30)∆V out = 750[nV] (6.31) Rppt Mean Square 1σ 3σ 3 ( RMS )1) 2) AD797 Input Voltage Noise Spectral Density5INPUT VOLTAGE NOISE ñ nV/ Hz4321010 100 1k 10k 100k 1M 10MFREQUENCY ñ Hz 6.27: Ultralow Noise, Ultralow Distortion OpAmp AD797