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Power Supply Rejection Ratio in Measuring Op-Amp Performance

This two-part test explores Power Supply Rejection Ratio (PSRR) in op-amp measurement loops. Part 1 covers the formula PSRR = ΔVOS/ΔVS with a minimum supply of 999R1+1.85V, while Part 2 discusses PSRR in the context of a maximum supply with a formula of PSRR = ΔVOS/ΔVS+3.25V. The tests examine VOS vs. VS, "soft" breakdown at high voltage, and issues like operation "falling out" at low voltage. PSRR is calculated as the slope over end-points for VOS in μV. The analysis includes various total supply voltage scenarios and criteria like RL=10kΩ connected to VS/2 and VOUT=VS/2 at TA=+25°C.

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Power Supply Rejection Ratio in Measuring Op-Amp Performance

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  1. Two op amp measurement loop

  2. Power Supply Rejection Ratio PSRR test part 1 of 2 PSRR = ΔVOS / ΔVS Min Supply 999 R1 R1 +1.85V DUT - + VOS A2 1000·VOS -0.85V

  3. Power Supply Rejection Ratio PSRR test part 2 of 2 Max Supply PSRR = ΔVOS / ΔVS +3.25V 999 R1 R1 DUT - + VOS A2 1000·VOS -2.25V

  4. Power Supply Rejection Ratio VOS vs. VS “Soft” breakdown at high voltage. VOS(μV) Operation “falling out” at low voltage. 1 2 3 4 5 6 Total Supply Voltage

  5. 120 90 60 30 0 -30 -60 -90 -120 PSRR is slope over end-points. VOS(μV) Max Vs Min Vs Power Supply Rejection Ratio At TA = +25°C, RL = 10kW connected to VS/2 and VOUT = VS/2, unless otherwise noted. PSRR = ΔVOS / ΔVS 1 2 3 4 6 Total Supply Voltage

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