vaka85
Advanced Member level 4

Hi,
I was searching the net for this topic but it's hard to find...
I have a sine signal obtained by an active opamp filter from a square wave.
This opamp has single supply, and so the reference for input and output signals is Vcc/2.
But if I have to add a second amplifier stage (another opamp), how can I connect it to the output of the first stage?
In other words, how can I refer it to the virtual ground (Vcc/2)?
Because if i connect it directly to the input of the second stage it doesn't amplify anything...
Thanks
I was searching the net for this topic but it's hard to find...
I have a sine signal obtained by an active opamp filter from a square wave.
This opamp has single supply, and so the reference for input and output signals is Vcc/2.
But if I have to add a second amplifier stage (another opamp), how can I connect it to the output of the first stage?
In other words, how can I refer it to the virtual ground (Vcc/2)?
Because if i connect it directly to the input of the second stage it doesn't amplify anything...
Thanks