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TLV9062: Problem with peak detector

Vincent Maurice
Prodigy 40 points
Part Number: TLV9062


Tool/software:

Hello,

I’m having an issue with the output voltage of my peak detector circuit.
I’ve attached the simulation file to this thread for reference.

Input signal :

  • Voltage: –3 V to +3 V

  • Pulse width: 10 µs (repeated once per minute)

When I simulate the circuit, I notice unexpected results:

  • For a 1 V input pulse, the output voltage rises to about 1.2 V.

  • For a 3 V input pulse, the output voltage only reaches around 2.6 V.

Could you please help me understand why the output doesn’t match the input peak voltage and how I can correct this behavior?

Thank you,

4643.ABS+PEAK+EXT discharge.TSC

Best regards,

Vincent

  • +1
    TI__Guru 68561 points

    The issue with 1V peak is caused by the overshoot at reset node that is stored across 100nF cap with no path for discharge.  Removing the cap solves the problem - see below.

    The issue with 3V peak is that 100n cap does not get fully charged within 10us pulse - removing the cap or lowering its value solves the problem (see below).