0.5 to 4.5 ghz limiter for 0dbm using PIN diode

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JAISHEE

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Hello
could somebody help me to design a limiter using PIN diode to get flat leakage of 0dbm? Shall i go for multistage PIN diode or 1 PIN and 1 schottky diode?how does limiter output depends on frequency?
and how can i simulate it in ADS? I didnt find a PIN diode model? and which simulation component i need to use in ADS to see graph of Po vs PI?
 

thank u for your reply and I'll go thr this link
 

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