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Recent content by asia

  1. A

    questions about laser drive circuit

    I do not why use 100Ω in the circuit , in my opinion 50Ω is right for impedance matching, can some one tell me the reason? thanks Then, I have another questions:"The inductance component can be added by bonding wires, but we cannot obtain a consisent inductance value." what is "bonding...
  2. A

    what is the difference between postive and negative voltage

    what is the difference between postive and negative voltage provider for IC? is positive more popular? Thanks
  3. A

    can someone check my circuit?it can't work, thanks

    the citcuit is to produce PRBS, but when I jointing the resistances , the ground and VCC are short. I do not the reason why. And I find that, when I jointing the resistances one antoher, the resistance between ground and VCC is reduced from 82Ω+130Ω to 0Ω. MC10131(DFF)MC10107(NOR) can someone...
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    someone has uesed AD96685?

    nobody knows?
  5. A

    someone has uesed AD96685?

    I do not kown why my circuit has no output,is connect wrong? Thanks
  6. A

    How much chip size will the Ls and Cs take?

    Thanks will 10nH L take 1mm×mm in 0.18um COMS process ?
  7. A

    How much chip size will the Ls and Cs take?

    nobody konws?
  8. A

    How much chip size will the Ls and Cs take?

    In my circuit, I want to use twenty Ls(10nH) and Cs(1pF), how much chip size will they take? Thanks
  9. A

    Is method to bring forward the signal?

    not delay, I want it bring forward about 60ns for the signal Thanks[/img]
  10. A

    How design a delay circuit for 60ns?

    the other day I forget a very important thinghs, I need to delay the signal that has different amplitudes, and the smallest amplitude is only about 15mV,so the gate delay will not work,am I right? And I do not want to use the line delay, as it is too long I want to ask is there any good method...
  11. A

    Question about phase difference and free oscillate frequency in PLL

    Re: question about PLL ver strangely,yesterday all the things are normal, but today,when I add voltage to the PLL,the output of MC1648 and the OSCin,OSCout of MC145152 are all only be about 30mv to 40mV, I check the circuit carefully,the voltage add to the MC**** is 5V,and I cannot find the...
  12. A

    question about optical transceiver

    I design a optical transceiver , the circuit board of transmitter and receiver is separately,when I add the voltage to the LA of the receiver,the signal all disappear, only a lot noise, and very stange, the circuit signal that drives the laser also becomes very bad, a lot noise in it , and I...
  13. A

    Question about phase difference and free oscillate frequency in PLL

    Re: question about PLL when the voltage to varactor is 1V ,the output frequency is 117MHz, the amplitude is 1.5V ,but when add 2.5V voltage to the varactor, the amplitude is 550mV(frequency is needed 155MHz), why it is so small? I think it cannot drive the nex stage circuit, is it ?
  14. A

    Question about phase difference and free oscillate frequency in PLL

    Re: question about PLL I am very depressed, I have designed this simple circuit for a long time and there is no any evolve. need help!!! I use the battery and orther DC source do the DC voltage, the frequency change range is too large,about 7MHz, and I do not kown the reason ,the varactor is...
  15. A

    Question about phase difference and free oscillate frequency in PLL

    Re: question about PLL may be the reason is that the DC noise is too much I check it later
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