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Macrol simulation of gain modulator in power factor preregulator

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simbaliya

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I want to do the macro simulation for a typical pfc ccm controller using ideal source in cadence. But I don't know how to build the gain modulator which generates the current reference. The formula for this block is that IGAINMOD=(IAC × VEAO × 1V)/square(VRMS), IAC, VEAO and VRMS are the three input for this block, output is a current. Can someone tell me how to use the ideal model to build this block?
 

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