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TL082-Q1: How the balance resistance is calculated

Part Number: TL082-Q1
Other Parts Discussed in Thread: TL082

Hi team,

How is the value of R3 calculated when R2 =600k,R1=100k ?

  • Hello Hazel,

    For an op amp with significant input bias current, R3 = R1 || R2 = (R1 * R2) / (R1 + R2)

    TL082 does not have significant input bias current so R3 could be zero. However make R3 between 1k and 10k to protect input pin from system faults or poor layouts.

  • Hi Hazel,

    take care, your feedback resistors are such high ohmic that you will run into stability issues. Your phase margin is smaller than 4°:

    Better add a phase lead capacitance of 4.7p...10p, as shown below:


    C1 restores the phase margin to 74° and ensures stability Relaxed