Analog signal linearization
Analog signal linearization
(OP)
Hi,
I need to linearize voltage coming out of a potentiometer(voltage divider). Any ideas?
Thanks.
I need to linearize voltage coming out of a potentiometer(voltage divider). Any ideas?
Thanks.





RE: Analog signal linearization
What do you want to linearise? Please expand and clarify your requirement.
RE: Analog signal linearization
position (angle if rotary )
<nbucska@pcperipherals.com>
RE: Analog signal linearization
RE: Analog signal linearization
One way would be to have a lookup table using an EEPROM, but would it be more space efficient if I did it analog?
RE: Analog signal linearization
RE: Analog signal linearization
If you need 0.1% linearity you need to pay more, a lot more, for the pot.
RE: Analog signal linearization
The pot you have is already pretty good, by the way. You will spend a lot of money to get 0.1% out of what is essentially a mechanical device.
RE: Analog signal linearization
linearity by the way ?
<nbucska@pcperipherals.com>
RE: Analog signal linearization
RE: Analog signal linearization
RE: Analog signal linearization
Audio taper is used as you would guess in audio applications to compensate for our hearing response.
Log or Power Taper is used to provide a response that is related by the LOG of the applied voltage.
So if you want a Linear output from the pot make sure you have started with a linear taper. You would be making your task more difficult to be using an Audio or Log taper pot and trying to linearize that.
From this point on your application can help define the style of pot you can use. Will this pot be adjusted only one time? Will the end user be adjusting it several times? Is this a control input? A reference setting (if so then I assume you would have measured the output)? A feedback sensing element? etc. etc..
For example, many precision pots are available with 0.1 or 0.05% linearity (Spectrol) for which you will pay in much dinero! These are usually 10-20 turn, wire wound, helical brushed pot. Now if you want to do this only once and not pay huge prices then you should use the previous suggestion of the Dallas EPot or one of the precision CERMET Film pots available from VISHAY (formerly Dale). The have a variety that shouls work for you.
Good luck,
Jim