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signal-summing linear-in-dB VGA at 2GHz

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jiayi.li

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hi,everyone.
I want to design a signal-summing linear-in-dB VGA at 2GHz for CDMA transmitter,please give me some suggestions about the linear-in-dB RF VGA.
How to achieve a gain error less then 2dB over 40dB gain range?
 

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