qslazio
Full Member level 3
pll loop gain
I upload a bode plot of the open loop phase transfer function of a 3rd order PLL with Charge pump. The low pass filter is a traditional 2nd order RC network.
As we know there will be 2 poles at DC, with a LHP zero at the higher frequency.
The last poles sitting in the right of the them.
From the Bode plot. We can see at frequency just around DC.The open loop gain will be very high, and the phase will be close to -180.
My question is that if i connect it in a feedback loop, and put a phase input varying slow(around DC).
Will the loop still stable?
Thanks!
I upload a bode plot of the open loop phase transfer function of a 3rd order PLL with Charge pump. The low pass filter is a traditional 2nd order RC network.
As we know there will be 2 poles at DC, with a LHP zero at the higher frequency.
The last poles sitting in the right of the them.
From the Bode plot. We can see at frequency just around DC.The open loop gain will be very high, and the phase will be close to -180.
My question is that if i connect it in a feedback loop, and put a phase input varying slow(around DC).
Will the loop still stable?
Thanks!