TL3016: Oscillator circuit.

Aaditya

I hope this is ok with you but I will provide the required support in our LMV7219 E2E post instead of responding to both individually.

So I will be closing this post.

Chuck

Hello Aditya,

Kai is on the right track, as this is a standard RFID frequency, there are many of-the-shelf oscillator modules available. They would cheaper, smaller, lower power and initially more accurate than a crystal + comparator + discrete components.

If you do wish to "roll-your-own", the LMV7219 datasheet describes the front page crystal circuit in section 8.2.2.4, though I personally think 200 ohms series resistance is a bit low and may overdrive the crystal (maybe around a few k), but not shown is the trimmer caps that may be needed to get the crystal on frequency.

You can also create a simple crystal oscillator with an inverting gate, which may be simpler and cheaper. Just Google "crystal oscillator inverter gate circuit" and you will see plenty of examples (the one with the two caps to GND is recommended...as it is easy to trim if needed)

We even have an application note about inverter crystal oscillators:

 https://www.ti.com/lit/an/szza043/szza043.pdf

Thanks Kai for education us all on this.  I will definitely be filing this away for future use if needed.

Aaditya

This was an interesting question where I initially thought the same as Kai to buy this off the shelf directly.  Thank you for providing the additional context of your question.

Chuck

Be sure to select "Zero Initial Values" in the Transient Analysis menu whenever simulating an oscillator, so that the simulator starts from zero volts instead of finding a steady-state DC bias point.

Aaditya

Basically Paul and I had to alter the values of the crystal to get oscillation.  Seems like this is very challenging to get the simulator to reach a steady state.  Definitely need to run simulation for an extended period of time.  Sorry I wasn't able to help more on your circuit.

Chuck