hello

i need to convert 1.2V from bandgap  to 1.22V for comparator input. How can i do that? The solution can't take to much current. (max 10uA)

any ideas?

regards

grosser wrote on Jun 16^th, 2006, 7:00am:


Hi,

Do you really need that 20 mV difference ? There are the following points to consider:

1. The variation of on-chip resistors in bandgaps gives approx. 50 mV variation in most cases across the process corners. Unless you are using a precisely trimmed bandgap, you may not gain much if you try to change the nominal value of your comparator reference to 1.22V.

2. Your comparator needs to have an offset appreciably lower than 20 mV.

May I ask why do you need such a precise comparator reference?

Regards
Vivek