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LM324: LM324N output voltage error

user5959647
Intellectual 960 points
Part Number: LM324

       The LM324N output voltage of the first/seventh pins is 0V without input signal. However, anomalies may result in output voltage is 0.13-0.19V, which may be caused by gain differences. Please help check if the VOS error of this design is within the specification range.

  • 0
    TI__Guru*** 144876 points

    Hello User,

    The signal gain of the left amplifiers is 91 (180k/2k+1) and the loop gain (also called noise gain) is the same, 91

    The voltage at the output is (Vin+Vos) * 91 ; so 0.19V output could be VIN = 0 and Vos = 2.09mV

    What are the supply voltages? If power is single supply then more factor come into play.