The data sheet for the OPA1677 shows a schematic (see Fig 8-1) for a Phantom powered preamp designed for a piezo transducer mic. It states that a TINA-TI simulation of the circuit is available but I cannot find it. I'm particularly interested in what model has been used for the piezo transducer. Does anyone know what simulation model is being used here or if the file for the schematic can be downloaded.
Robin,
The simulation circuit is not available however I have created this circuit in Tina Ti for convivence and used the capacitance stated in the product data sheet that was used for the result. I checked the -3dB point with a few various values of capacitance and it seems to align with the stated datasheet equation for the low corner frequency. My simulated gain is slightly higher than the result in the data sheet. My suspicion is that the data in the data sheet was measured or done with an early version of the model prior to release. Please see the attached Tina simulation circuit below.
Robin,
I have re-downloaded the file and it seems to be running for me. Are you still having trouble with it?
Best Regards,
Chris Featherstone
