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TLV9062: Negative impulse peak detector

John Tauch
Intellectual 585 points
Part Number: TLV9062

We are using the TLV9062 in a peak detector circuit. The impulse can be either positive or negative with a max impulse magnitude of +2.5V or -2.5V.

We basically have one circuit using the noninverting input for positive impulse and another circuit for the negative impulse shown below.

We have simulated the attached circuit in TINA and it works, but I am concerned with our configuration being a single voltage rail and V- tied to ground.

It seems like this should be a negative supply rail. 

Thanks

  • 0
    TI__Mastermind 24560 points

    Hi John,

    Even though you have a negative input signal on the circuit, you are not violating the input common mode range or input signal range of the TLV9062 since the output is still able to have the Vin- = Vin+ (ignoring the offset voltage). 

    I created your circuit but put a -2.5V on the signal to show what is happening here. 

    Let me know if that makes sense! 

    Best Regards,

    Robert Clifton

  • 0
    Guru 140200 points

    Hi John,

    two peak detectors give two separate output signals. Is this what you want?

    Two manage the task with only one peak detector, you could put a full wave rectifier in front of the peak detector.

    Keep also in mind, that these sorts of single supplied circuits having to deal with bipolar signals heavily profit from introducing a "pseudoground", which is best set at middsupply.

    Kai