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Peak Detection using OPA2354

PRADEEP RAJ23
Prodigy 60 points
Other Parts Discussed in Thread: OPA2354, TINA-TI

Hi,

I am using OPA2354 for detecting the peak of 180KHz pulses at 1.8V.

As I don't want to interfere with input or output impedance, I am using input buffer and output buffer as shown in below schematics with a diode in the input buffer feedback stage. VCC is 5V.

I have a basic question that this OpAmp is suitable for this requirement? And the output of the output stage will be of 1.8V?

Thanks & BR,

Pradeep.

  • 0
    TI__Genius 12631 points
    pradeep,
    The OPA2354 should meet your requirements. Only thing I would check is the output swing requirements. You are using single-supplies and the negative supplies are tied to GND. The OPA2354 can swing to within 100mV of the rail. I would maintain some guardband there so I am not pushing the design to the edge.
    -Samir
  • 0
    TI__Genius 13935 points
    Hi Pradeep,

    It is hard to tell for sure without testing if the circuit will work as expected.

    It would be good to have some resistance between the diode and the amplifier output to help with stability. It may also be necessary to add come components to keep the amplifier from going open loop during negative pulses.

    A good way to test this circuit would be to model it in our TINA-TI software. It is available free on the web and it has the OPA2354 already loaded in the model library (Spice Macros/Op Amps).

    Regards,
    Loren