CMOS Analog Switch and the +/- 20mA current injection

[abhishek.k]

site:www.edaboard.com cmos switch

Hi All,

I am desining a CMOS Analog Switch with Ron < 500 Ohms . However one specification for the Switch says that "it should be able to handle +/- 20mA current injection". What exactly does this injection current spec means, and how should I take care of this in my design.

Can any of you help me in this ? I will be very grateful.


Regards,
abhishek]

 

[IanP]

cmos analog switch

This spec means, that your circuit should be able to source or sink 20mA; in other words, your circuit should be capable of "delivering" 20mA or "taking" 20mA..
Regards,
IanP

 

[abhishek.k]

Re: CMOS Analog Switch

Hi IanP,

I also thought so, but the meaning of this spec is that in OFF mode, the switch shoould not start conduction when +/- 25mA of current is injected from input. However I am still not very clear on how to incorporate in my design. Can anyone help me?

Regards,
abhishek