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RF PAD, need to use ESD? (Read 2709 times)

wccheng

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RF PAD, need to use ESD?
May 16^th, 2004, 6:52am

Dear all,

For the high frequency PAD, do I need to use ESD? As I know, the ESD pad with high parasitic capacitor. If I use it in the high frequency path, it will affect my performance. RIGHT???? ???

If the ESD is needed to use in the high frequency path, is any special ESD for high frequency? Could you teach me? Thanks ;)

Best Regards,

wccheng

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City

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Re: RF PAD, need to use ESD?
Reply #1 - May 18^th, 2004, 12:35am

Hi,

I don't exactly know what at what max frequency you are operating but a compromise for ESD in RF is to use ESD supply (transient) railclamps together with junctions diodes. For the RF pad, you might just want to reduce the diode area so as to reduce the parasitic associated capacitor (beware of additive nonlinearity).
I have seen some papers about ditributed ESD protection, but it is highly area inefficient. Another possible way is to come out of the chip with impedance transformation (via integrated baluns) at lower impedance, so that you may keep a satisfactory ESD protection.

City

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