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TL026: TL026: AGC from DC ?

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Replies: 2

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Part Number: TL026

We need an amplifier with AGC from  DC to low frequencies (bandwidth is not relevant) for a constant  output level from a power detection circuit .

I have seen the TL026 is a VGA amplifier and I wonder if it could be a good candidate.  Is it?

Otherwise we appreciate very much you to recommend the best part or alternative solution.

  • Hi Victor,

    I would give the LM13700 a try. Have a look at figure 25 of datasheet.

    Kai
  • In reply to kai klaas69:

    Victor,

    From a theoretical point of view, AGC on a DC input produces a constant. The AC will be attenuated by the DC value and the DC value will be lost. Not truly lost, as a the AGC control level will contain it. Another option is a log amp to compress a wide range signal without lag from AGC control. I do agree with Kai's LM13700 suggestion if AGC is needed.

    Is the goal to detect power in a circuit or measure it?
    Can you describe the range of the input signal and desired output signal?

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

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