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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TS4975 датащи(PDF) 30 Page - STMicroelectronics |
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TS4975 датащи(HTML) 30 Page - STMicroelectronics |
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30 / 36 page  Application Information TS4975 30/36 4.7 Notes on PSRR measurement What is PSRR? The PSRR is the Power Supply Rejection Ratio. The PSRR of a device is the ratio between a power supply disturbance and the result on the output. In other words, the PSRR is the ability of a device to minimize the impact of power supply disturbance to the output. How we measure the PSRR? The PSRR was measured according to the schematic shown in Figure 62. Figure 62. PSRR measurement schematic Principles of operation ● The DC voltage supply (VCC) is fixed ● The AC sinusoidal ripple voltage (Vripple) is fixed ● No bypasss capacitor Cs is used The PSRR value for each frequency is calculated as: RMS is a rms selective measurement. PSRR 20Log RMS Out put () RMS V ri pple () --------------------------------- dB () = |
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