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Recent content by ack88

  1. A

    Transfer function of PFD

    Is there a specific relation between change of frequency in the two inputs and the phase error?
  2. A

    Transfer function of PFD

    Thank you guys for the reply. The above PFD plot was plotted the same way , i have varied the fb input with +Pi keeping the reference input constant. The problem i am having is that the system gets in phase but the VCO output frequency is not the frequency i expect. Now, I have given Clkin as...
  3. A

    Transfer function of PFD

    These are the plots i obtained from VCO and PFD. how should i adjust the gain of PFD so that i get the required frequency at the output of the VCO.
  4. A

    Transfer function of PFD

    Saro_k_82 : thanks for the reply , i used the linear approach to calculate all the gains for the given PLL but i am not getting the required output .So i was trying to get exact relation between the the 2 inputs of the phase detector . Do you have any approach so i can get the exact nonlinear...
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    Transfer function of PFD

    Hello, Thanks in advance for reading. I am trying to find the transfer function of a PFD block in a schematic of PLL in Cadence Virtuoso . How can i find the transfer function of PFD block? How can i sweep the input phase difference to get the transfer function...
  6. A

    Op amp circuit to drive 20uF load

    Thanks for the reply FvM it helped a lot. I added Riso(about 500m ohm) and checked the output it is good for about 5-7 khz but after that the same story its unstable , so to continue from here any other compensation technique with which i can deal with higher frequencies. I have attached the...
  7. A

    Op amp circuit to drive 20uF load

    Thanks for the references it helped . The op amp selected has unlimited capacitive loading and also it gives a good output for a limited range . I am trying to give a 100mV -Vac at 20kHz . the slew rate for the op amp is 125V/us. So at 20kHz i am able to give only around 19mV as input. So any...
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    Op amp circuit to drive 20uF load

    Hello, Thanks in advance for reading. I am trying to drive a 20uF load with the opamp circuit attached .I have used AD825 op amp.Basically I am giving [Vac + (Vdc/2) ] at non inverting input and getting Vac+Vdc at output. The output is not stable with this configuration...
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