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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ADA4620-1ARZ-R7 데이터시트(PDF) 37 Page - Analog Devices |
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ADA4620-1ARZ-R7 데이터시트(HTML) 37 Page - Analog Devices |
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37 / 49 page  Data Sheet ADA4620-1, ADA4620-2 analog.com Rev. 0 37 of 49 Figure 117. Ideal Gain and Phase Plot of the Transimpedance Amplifier Design with Compensation The gray trace in Figure 117 shows the ideal noise gain over frequencies for the photodiode preamp. Calculate the noise bandwidth at the fN frequency by: ������ ������ = ������ ������������������ (������������ + ������������)/������������ (7) In reality, noise gain is limited by the gain bandwidth of the op amp, and rolls off with open-loop gain. The gray trace in Figure 118 shows a more realistic noise gain plot, compared to Figure 117. Figure 118. Attenuated Noise Gain, with Attenuation Following Open-Loop Gain OPEN-LOOP GAIN I-TO-V GAIN NG = 1 G = 1 + CS/CF fX fZ fN fGBP f f fP 0° 45° –45° 90° –90° –135° NG = RFCFs OPEN-LOOP GAIN fZ NG = 1 + CS/CF NG = RFCFs NG = 1 log f |
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