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Needbias
Joined: 03 Mar 2002
Posts: 164
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 13 Apr 2002 14:15 |
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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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Needbias
Joined: 03 Mar 2002
Posts: 164
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| 20 Apr 2002 16:31 |
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why no response,does there has any expert on
RF design?
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unkarc
Joined: 28 Apr 2001
Posts: 282
Helped: 36
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| 22 Apr 2002 15:01 |
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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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Needbias
Joined: 03 Mar 2002
Posts: 164
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| 22 Apr 2002 17:08 |
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Unkarc,
Thanks for your help
I will go on to see it
thx so much
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ptoo30
Joined: 07 Apr 2002
Posts: 57
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| 24 Apr 2002 16:20 |
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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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