DDL - faster Nernst cell sensing

[Carter Shore]

On Tue, 27 Nov 2001 18:22:09 Ludis Langens wrote:

> There is no need for a virtual ground (ala DIY-WB) 
> or even a negative supply.  One side of the pump 
> cell doesn't need to be held at a constant voltage. 
> Connect both sides to active drivers.  One side gets
> driven to a low voltage while the other is driven to
> a high voltage.  Reverse the order to get current 
> flowing in the opposite direction.  This is how GM
> runs their IACs.  The voltage levels chosen need to
> be such that the sense cell voltages stay within the
> range that the circuit can handle.

Are you referring to an H-bridge driver arrangement?
Lot's of IC solutions out there. For low current
applications, you can use the outputs of two CMOS
buffers driving each side, one input gate to each side
of an inverter. 

Carter Shore

__________________________________________________
Do You Yahoo!?
Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month.
http://geocities.yahoo.com/ps/info1
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org