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  1. #1
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    I want to design a IQ mixer:1.5GHz at center frequency,10% bandwidth,the output requirement of two IF----I and Q must have the amp_error of less then 0.5 dB and have less then +/- 1.5degree phase error,is it possible?Anbody can give me some advice?

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  2. #2
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    why no response,does there has any expert on
    RF design?


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  3. #3
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    Hi,

    Unfortunately I have not built IQ mixers for the GHz band so no experience.
    But some info on the internet may be of some help to see how others do it:
    maybe one of the Linear Technology IC product at h**p//www.linear.com/prod/datasheet.html?datasheet=826 (replace * with t)
    or the Remec page at h**p://www.remecmagnum.com/Components/Mixers/IQMixers.html

    Also if you search with google.com for words like IQ mixer, you will receive several hits of interest to this topic.

    regards, unkarc



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  4. #4
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    Unkarc,
    Thanks for your help
    I will go on to see it
    thx so much



  5. #5
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    Hi Needbias
    i have experienced to design CMOS GHz band I and Q mixer,its not bipolar so my experience can help you or not?
    1 amplitude offset: this is caused from the etching process error,particle and others and as a circuit there is DC voltage offset, it will affect ac gain and of course layout design affects much to it so i use offset canceller. the amplitude offset is smaller than 0.5dB at bandwidth is 2MHz (i want to know why you have 10% bandwidth of 1.5GHz this is too wide and is it allowed to use such a wide bandwith?)
    2 phase error: i forgot the measured value but aound +/-2deg? if you want to know more precise i can revew my notebook.
    sorry not so helpfull
    rgz



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