These voltages go up to 9 V, which is too near the positive rail. Try if you get better results with a rail-to-rail opamp like the TLV9101.
Anyway, in TIPD139, the input signal goes to the non-inverting input of the first opamp:
Hi Aldo,
Thanks for using the TI E2E Forums!
This is from a previous discussion on this very subject:
Envelope detection can be accomplished with an op amp based precision rectifier, but often the simple diode detectors are sufficient for general applications…
Hello Luis,
Though it's hard for me to definitively state which is best for your situation, a full-wave rectifier will give you a representation of the entire waveform. You can then digitize it using an ADC and can then run algorithms in software to…
Hi Nhan Please take a look at this TI Precision Design.
It may have what you are looking for, or at least point you in the right direction. Best regards, Jim B
