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Recent content by czjpassby

  1. C

    PLL

    So kind of you. I am sorry for my unspecific picture, circuit diagram represents block diafram of filter, the redrawn picture is as follow: Answer to first question is phase ; The answer to the second question is the same as the answer to Example 1，yes, there will be current flow into...
  2. C

    PLL

    Thank You . I1 represents Ir+Ic2, and I2 represents the current follwing into CCO, change term (R+1/sC2) to (R//1/sC2)
  3. C

    PLL

    Thank you for your reply, I tried to derive the transfer function as follows. But this result is based on current I2 equals to 0, so is it right? please
  4. C

    PLL

    Thank you for your reply, I tried to derive the transfer function as follows. But this result is based on current I2 equals to 0, so is it right? please
  5. C

    PLL

    Hi,all, plese guide me how to derive the transfer function of the PLL as shown in the figure, the signal from the PFD can control the resistance of the resistor
  6. C

    fully differential opamp' s output is not symmetrical

    thanks for all of you, I have got the reason
  7. C

    M1 is an instance of an undefined model nmos2v

    dear friends: when I use spectre, somehing errors appears: "M1 is an instance of an undefined model nmos2v" I check the model library and netlist, I found the name is netlist is cellname not model name, e.g: the mos in my circuit cell name is nmos2v, the moldel name is nch...
  8. C

    fully differential opamp' s output is not symmetrical

    dear FvM: thank you for your reply. can I think that is a normal results? if it is, could you tell me the reson about the undifference befor 1ms as shown in figure. 1.
  9. C

    fully differential opamp' s output is not symmetrical

    dear friends: the tran simulation of a fully differential opamp likes the following figure, the frequency of input signal is 5MHZ to obtain figure.1 and it is 100hz with figure.3. could you explain why it is not symmetrical at the begin, I wonder why it is not similiar with figure...
  10. C

    [SOLVED] Stability Simulation with Cadence

    dear friend: What your said is helpful for me, and could you share the article (that comes form frank as you mentioned ) with me, I am confused with fully differential opamp's STB analysis. thank you very much!
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