From: sleeper75se_at_yahoo.se
Date: 2001-11-30 16:51:30
> IRMS6118 from Infineon
> http://www.infineon.com/cgi/ecrm.dll/ecrm/scripts/prod_ov.jsp?oid=
13990&cat_oid=-8199
> needs about 2.5 mA during transmission according to the data sheet.
Thats pretty good, perfect for battery operation.
> If we use NiMH rechargeable batteries with 1500mAH capacity, we
> could run our EEG for quite a long time without recharging. I'd
> like to use 4x1.2V batteries, but I'm not sure about the OpAmps,
> how much voltage we need for them. For voltage regulation I thought
> about a MAX603/4. Any other suggestions ?
I don't think we need a regulator. If we have 4.8V from the battery,
the digital parts will run happily, though it's hard to tell for how
long, as the voltage drops. For the analog section we can let digital
ground be -2.4V and digital VCC +2.4V. If we need more than that,
it's possible to add two batteries at the 'ends' to achive +/- 3.6V,
more than enough for a lot of opamps. What do you think about that?
/Andreas
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:32 BST