Are you sure ?

Perhaps you could redesign the worlds telcoms systems using voltage
transmission

Peter Cousens
cousens@biscit.biz

> -----Original Message-----
> From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On
> Behalf Of Mike Singer
> Sent: Friday, July 04, 2003 10:11 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: 4-20 mA tutorial
>
> Neil wrote:
> > Current-mode signals are generally less susceptible to
> > electronic noise (than voltage-mode signals), so great
> > for sensors in industrial or other noisy environments.
>
> Neil, what do these obscure phrases mean: "Current-mode
> signals", "voltage-mode signals"?
>
> Why not plain words describing actions: "setting output
> current" or "setting output voltage"?
>
> It's not "noise" consideration, when one choose to set
> output current instead of setting output voltage, I think.
>
> It's just a humble desire to get a signal on the other
> end of the line, which doesn't depend on the line
> resistance. (Ask Olin how to set current in a line. He
> is well-known common-base and cascode scheme guru now :-)
>
> When setting output voltage you can fight noise by setting
> high enough voltage on a low enough load resistance.
>
> Mike.
>
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