I'm designing a Colpitts oscillator with a single supply rail-to-rail opamp powered with 3.3 V. The positive input of the opamp is set to VDD/2 to offset the negative part of the oscillations so everything stays between 0V and 3.3V.
I have to make a few design considerations and I'm wondering which one is best and why.
What would be better and why, to attach the capacitors to the virtual ground or the real ground? Both circuits work (simulation) but I wonder which is best, I have a small preference to the second circuit because then the virtual ground opamp doesn't need to deliver much current.
I already read following post. Can oscillators be made from a single supply?
Virtual GND = VDD/2
Real and Virtual GND combined