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[SOLVED] Input gain of a passive mixer

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milvapp

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I have designed a single-balanced passive mixer having an ideal current source
as input.After the switches,as seen in Fig.1,there are LPF's with a cut-off
frequency of 10 MHz.I get the expected output however I cannot understand
why when I plot the input gain,its form is like the one shown in Fig.2 .Shouldnt it
be the similar to the LPF?
(I run PSS/PAC analysis to get the results).

Fig.1passive mixer.JPG

Fig.2input gain.JPG
 

milvapp

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Does anyone like RF ?:p

For those who are interested in the solution the product of downconversion and upconversion voltages
creates a bandpass filter to the RF input which gives the respective response..:)
 
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