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input matching for wideband mixer using cadence

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kogi88

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Hi,

now i designing differential mixer. so there are two input node and each node designed to 50ohm input matching. when i do matching each node i connected to 2 differences port and made adjustment to get 50 ohm. but i got saw few thesis the input matching did by connecting each input different node connected to only one port (one to positive node and other negative node of input port). when i try both ways the s11 is totally different. which method are correct. anyone can show the correct testbench for wideband mixer design?

Thank you in advance
 

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