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Rx+ baseband filter and VGA overall voltage gain simulation?

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wccheng

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Dear all,

I have a Rx chain (included LNA+mix1+mix2) + baseband filter and VGA. I have combined all together and run the PSS + PXF in order to get the overall voltage gain. However, the simulation result is strange to me. It gives the M-shape voltgae gain and the voltage different is 10dB. However, the voltage gain flatness of Rx chain is within 1.5dB. The gain flatness of baseband filter+VGA is within 1dB. Why the voltage different for overall chain is 10dB and give the M-shape curve? Is there any special setting for this kind of the system? If yes, could you teach me the simulatino setting using SpectreRF?

Thanks
 

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