Does the LNA need the ESD?

[yolande_yj]

Re: Do the LNA need the ESD?

The right one is OK. But its ESD level should be enhanced for production.

Is there other pratical proven solution? Is the right one most commonly used?

 

[oxynitride]

Re: Do the LNA need the ESD?

In fact you can use both, if you use R then use not so high value (use simulations). the one with added diodes in series, you have to make sure the diodes are sized correctly. but why not add a dc-blcokcap? for what process tech is this ?
another simpler way is to make your npn bigger with some additional layotu changes to make it self protecting.
hope this helps.
oxy

 

[yibinhsieh]

Re: Do the LNA need the ESD?

yolande_yj wrote:

Is there other pratical proven solution? Is the right one most commonly used

The right one is most commonly used. For SiGe process, it is always used.

The main drawback is the leakage problem from 3 series diodes.

Yibin.

 

[yolande_yj]

Re: Do the LNA need the ESD?

In fact you can use both, if you use R then use not so high value (use simulations). the one with added diodes in series, you have to make sure the diodes are sized correctly. but why not add a dc-blcokcap? for what process tech is this ?
another simpler way is to make your npn bigger with some additional layotu changes to make it self protecting.
hope this helps.
oxy

The process is SiGe. If DC block is integrated, it requires a large chip area and degrades NF I think. Do you think so?

Added after 3 minutes:

The right one is most commonly used. For SiGe process, it is always used.
The main drawback is the leakage problem from 3 series diodes.
Yibin.

Leakage? AC or DC? under what condition? can you elaborate? Thanks.

 

[mckinson]

Do the LNA need the ESD?

Why not add a small value capacitor to Ground ?

 

[cmosbjt]

Re: Do the LNA need the ESD?

Why not add a small value capacitor to Ground ?

what do you mean?