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How to reduce effect of temperature to relaxation oscillator (using AD8542)?


I'm using AD8542 to create relaxation oscillator with the schematic below

But it has problem with temperature. Frequency out is drift about 4-5Hz/*C.

Can you help me to reduce this effect?

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  • Hi Harry,

    I've tried with AD8535 and AD8552 but the problem is not fixed.

    The output is still effected by temperature. And I found new problem.

    With the same circuit (just change opamp), there are the different frequency output

    - With AD8542: Fout ~ 5050Hz, drift about 4-5Hz/*C

    - With AD8552: Fout ~ 4800Hz, drift about 5-6Hz/*C

    - With AD8538: Fout ~ 5170Hz, drift about 4-5Hz/*C

Reply
  • Hi Harry,

    I've tried with AD8535 and AD8552 but the problem is not fixed.

    The output is still effected by temperature. And I found new problem.

    With the same circuit (just change opamp), there are the different frequency output

    - With AD8542: Fout ~ 5050Hz, drift about 4-5Hz/*C

    - With AD8552: Fout ~ 4800Hz, drift about 5-6Hz/*C

    - With AD8538: Fout ~ 5170Hz, drift about 4-5Hz/*C

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