milkdragon
Junior Member
Offline
RF idiot
Posts: 30
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Yes, it does affect the performance of the circuit. Stacking up more diode is to prevent any forward biasing it with a large signal, of course, at the expense of the ESD performance. Typically trade off is made here on the RF performance and the ESD performance. The foundry was rite by putting one more diode near the gate for CDM clamp for further protection. However, typically it is used in conjunction with some resistance between I/O pad and the input device. If CDM is your concern, then you should add this diode. However, as far as i know, most people ignore it for RF operation.
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