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TLV3501: Waveform conversion circuit using TLV3501 and OPA1611

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