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ques related to sps simulation of downconversion mixer in virtuoso

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nisha gupta

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can any1 tell how to simulate sps analysis of downconversion mixer in virtuoso. actually when i m giving sweep type relative it is showing 8dB gain( that is similar what i m getting through transient). but rf sweep is vaying. when i m giving sweep type absolute. IF harmonic is cmng negative and gain is also negetive. i m not able to understand why.
 

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