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TLV3501: Waveform conversion circuit using TLV3501 and OPA1611

Prodigy 110 points

Replies: 5

Views: 93

Part Number: TLV3501

Hi,

 I intend to use TLV3501 to build a zero crossing comparator and use OPA1611 to build a integrator.

The input voltage vg is a +/- 1V 100kHz sine wave. The desired working waveforms is:TLV3501 output a +/-2.5V 100kHz squre wave, which is in phase with Vg.  Then, a integrator is applied to convert the square wave vo1 into a triangle wave Vout2. However, the simulated waveforms are grately different from the expected ones.

Please see the simulation results below. Once I combine the comparator with the integrator, vo1 would be limited to +/-1.81V and vo2 would have a large DC offset. However, when I seperate the two circuits (comparator and integrator), the waveforms are nomal. Obviously, the combination of these two circuits yields some unexpected problems.  Kindly to help me to figure it out why these unexpected waveforms occurs.

Best regards,

Cato

  • Hi Cato,

    RI=100R looks like a short circuit to the output of TLV3501. I would considerably increase RI.

    Kai

  • In reply to kai klaas69:

    Thanks for the advice as always Kai.

    The current on the output is getting clamped from the current draw on RI = 100ohms. Increasing this resistor value as Kai stated should help the device reach its full intended output swing.

  • In reply to kai klaas69:

    Hi Kai,

    Thank you for your advice. Incresing R1 works.

    Cato

  • In reply to user6307693:

    Good to hear that it works now, Cato :-)

    Kai

  • In reply to kai klaas69:

    this has been resolved, so I will close the post

    Chuck

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