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Recent content by andrew_luo

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    The demodulation methods of DPSK

    about dpsk! From abundent material about psk,i konw there are following demodulating method: 1. differential method: it is the most easy to demodulate the signal,just need to mutiply two successive codes, however the delay time is critcal. 2.generate an carry wave using costas loop or...
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    a 0.1 rmada length open microstrip serve as an capacitor ?

    Re: a 0.1 rmada length open microstrip serve as an capacitor DJ and anyone who knows the above questions,plz come in. This is easy but critical issue.
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    does anyone know how to design an oscilator

    i dont know your meaning?
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    a 0.1 rmada length open microstrip serve as an capacitor ?

    Re: a 0.1 rmada length open microstrip serve as an capacitor the way that i implement open stup is simple, just remove the copper on the bottom of substrate, now the ground is not very far since the whole board is nearly 18*22mm, why the characteristic impledance is higer if the ground is...
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    a 0.1 rmada length open microstrip serve as an capacitor ?

    Re: a 0.1 rmada length open microstrip serve as an capacitor thanks for answering, we can use some simulate tools to caculate the impedence,ADS,hfss,etc.it is easy to simulate the microstrip,however,if the line is just single layer copper, what is the characteristic of the line?i think is not...
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    a 0.1 rmada length open microstrip serve as an capacitor ?

    a 0.1 rmada length open microstrip serve as an capacitor ? while if the ground of the microstrip is taken, it work as an inductance? am i right ,what is your opioion? and the width of the microstrip is nearly 100 mil.
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    does anyone know how to design an oscilator

    lots of compact antenna employ some load (resistance.inductance,capacitance)to achieve high gain. somebody know that? plz tell me, thanks a lot.
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    does anyone know how to design an oscilator

    thanks, but i cant find that book. can somebody give me some hint or experience on designing an oscillator . i really appreciate for that.
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    What is the main difference between R&D and FAE ?

    Re: to be an FAE or R&D which is in more need and can earn more money? :o
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    What is the main difference between R&D and FAE ?

    to be an FAE or R&D do you think to be an research and developer is the older the better especially in hardware design. whether it is the same as to be an field application engineer or technic surpporter. what is the main difference between R&D and FAE,what kind of technics does them need to...
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    does anyone know how to design an oscilator

    the oscliator is working at 315MHz and designed by microwave transister with ft=7Ghz and SAW devise. The critical problem is the whole board including the antenna is limitted in the 18*20mm area. i want to know: 1.how to desing an high gain microstrip antenna in this situaton. 2.how to match the...
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    [spartan2]How to deal with the VCCO ,Vref ?

    what is vcco?
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    Which RF simulator is Better ! ! !

    i think ADS is more comlete than the rest two, but the most important is profesional knowledge , simulate softwares are just an assistant.
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    Free ISM Band in China

    yes, 900Mhz is occupy by gsm, and 2.4GHz is free.
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