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Recent content by flamingo

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    voltage gain variation over PVT corners

    -What kind of resistors ( if any) you are using. Is this the best tolerance you can use? I am using TSMC18rf, and rphres as the resistor. This type is the best tolerance over temperature (within 5% over -40~85°), but still have about ±12% variation over process. - Can you use Bandgap voltage in...
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    voltage gain variation over PVT corners

    Hi, all. I am now designing the RF front-end for 2.4ghz band, including a LNA and IQ mixers. By using gm-constant biasing for LNA and mixers, there is still about ±1.5 dB variation in voltage gain over -45~85 ° temp variation in a given process corner, and can be up to about ±3dB gain variation...
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    voltage gain variation over PVT corners

    Hi, all. I am now designing the RF front-end for 2.4ghz band, including a LNA and IQ mixers. By using gm-constant biasing for LNA and mixers, there is still about ±1.5 dB variation in voltage gain over -45~85 ° temp variation in a given process corner, and can be up to about ±3dB gain variation...
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    how to setup the icfb? schematic editing tool

    icfb tool I have installed icfb 5141 on my laptop. But I found some differences from the ICFB that I used before, and I think it must have something to do with setup. such as: when I use schematic composer, I want to draw a wire. Press "w" will popup a interactive window, showing wire's...
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    "device or resource busy. " Cadence simulation err

    Re: "device or resource busy. " Cadence simulation Thanks hqqh. I checked the icfb version, ic5.10.41_USR3.27.30, to 2005. Is this version older than IC5.1.41.500.3.54?
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    "device or resource busy. " Cadence simulation err

    cadence device busy am using a network enviroment in simulation, that is, all the user files are located in a fileserver, while the cadence main programme is located on another server. There is no problem when I run the simulation first time, but when I want to simulation again icfb will tell...
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    Device or resource busy, cadence error!!!

    cannot remove .nfs device or resource busy I am using a network enviroment in simulation, that is, all the user files are located in a fileserver, while the cadence main programme is located on another server. There is no problem when I run the simulation first time, but when I want to...
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    "device or resource busy. " Cadence simulation err

    I am using a network enviroment in simulation, that is, all the user files are located in a fileserver, while the cadence main programme is located on another server. There is no problem when I run the simulation first time, but when I want to simulation again icfb will tell me " *error*...
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    How to change gamma while NF simulation in SpectreRF

    With decreasing L, γ in channel thermal noise formula increased to about 2~3. However, we don't know the γ value in SpecteRF simulation. If simulation tool uses BSIM3 model, the thermal noise model based on inversion channel charge is used, and no parameter like γ can be found. So the problem...
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    let's talk about on-chip matching problem

    match maybe first important in blocks that directly connect to board, such as LNA. matching methods are depending on your applications, wide-band or narrow band. If narrow band, L can be used because its tune facts and will also improve noise figure. As for wide-band, common-source with L...
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    What kind of information need be drawed in the schematic?

    Re: What kind of information need be drawed in the schematic max current over process, temperature, voltage corners matching key routing, parasitics, especially in high-frequency application.
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    How to use spectre to perform post layout simulation?

    using awd or wavescan tools to open the psf files. you can open two database and plot different items in a same graph.
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    problems about ldo in rf frontend

    Maybe LDO is ringing while loading by PLL, check the Phase margin of your LDO. with LDO the PLL generally is more stable.
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    single input - differential output RF circuit

    Maybe common-source and common-gate with same amplfication factor can be used, one is positive gain, the other is negative gain. The problem is to ensure that two circuits provide same abosulte gain. Just an idea:D
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    Discuss: architecture choice on DVB-C/T

    The traditional is single-conversion with IF at about 36MHz, and a on-board RF bandpass tracking filter is a must. This is called can tuner. Although it's bulky compare to the emerging silicon tuner, can tuner can provide better performance, such as sensitivity, image rejection, etc. But silicon...

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