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Recent content by Ghitani

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    Help me design a ring VCO (120-130 MHz, -80 dBc/Hz at 100kHz)

    Ring VCO Hi I need to design ring VCO of the following specs: 1- frequency range: 120 --> 320 MHz 2- phase noise: -80 dBc/Hz @100kHz Please: 1- Suggest me a suitable circuit 2- State if you have tried it yourself or not 3- Provide me with some guidlines for designing ring VCO (How to lower...
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    Why we can't measure the built-in potential of a pn-junction using a voltmeter ?

    Re: P-N Junction Thanx all I assume I have digital voltmeter which has infinite input impedance also even if the built-in potential can't be known accurately its average is NOT zero To make the picture more clear: When you draw the famous graph of the electric potential vs. distance you...
  3. G

    Who can help me explain what's the current source for?

    No, I think the reverse is true: This circuit will limit the current in expense of circuit speed
  4. G

    Why we can't measure the built-in potential of a pn-junction using a voltmeter ?

    Can anyone explain to me why we can't measure the built-in potential of a pn-junction using a voltmeter ?
  5. G

    Transmission gate question ?

    Choose supply levels same as input voltage levels
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    Online resources about Photolithography Roadmap

    Re: lithography ITRS will do the job, Khouly **broken link removed**
  7. G

    What's the relation between dB and dBm?

    Re: dB and dBm xdB = 10 log (Pout / Pin ) used to measure power gain xdB = 10 log ( P / 10^-3 ) used to measure power
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    How to measure the open-loop voltage gain of a OP??

    calculate open loop gain Have u tried to obtain a closed loop gain of 50 dB ? If not then try !!!
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    circuits for universal programmer

    What is meant by universal programmer ?
  10. G

    how electron junp into conduction band in room temp.

    This what is called Thermal equilibrium where electrons jumping from valence band has the same rate as the electron falling from conduction band so the number of electrons remains constant for a given temperature .
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    How to measure the open-loop voltage gain of a OP??

    how to measure the gain of a loop in spice The try what I've suggested in my last post . There may be error in the model of the op-amp .......
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    how electron junp into conduction band in room temp.

    When an electron in the valece band accept an energy greater than the energy band gap of the material , it jumps to the conduction band .
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    How to measure the open-loop voltage gain of a OP??

    closed loop gain measurement Why do U suspect the value of 50 dB ? If u see that it is not large enough , the OP-amp needs just enough gain to acheive the desired closed loop gain i.e. If this OP-amp is used as a buffer it just need an open loop gain of 20 dB !!! To check that the open...
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    Total harmonic distortion

    Total harmonic distortion : the sum of powers of harmonics of a signal divided by the power of the fundamental Significance : It tells information about the linearity of the system : The less Total Harmonic Distortion , the more linear .
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    How to measure the open-loop voltage gain of a OP??

    measure op amp open loop gain I suggest U may make dc sweep for a dc source then differentiate the output with respect to the input
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