Hello fellows,
I'm working on a project and I have the need to use analog to digital conversions, I need to get a precise and low noise voltage reference, in order to get more accurate measurements of course.
After reading a litte bit, I've found a couple of things that could be useful (I think)
My idea is to use a RC low pass filter like this:
To filter a 12V voltage input (switched power supply), with a 20ohm resistor and 2000uF capacitor, which gives a cutoff frequency of about 4Hz (according this calculator http://sim.okawa-denshi.jp/en/CRtool.php).
Once filtered, feed a circuit like this:
The LM4040DIZ-4.1/NOPB (5) is a voltage reference diode (according http://www.skillbank.co.uk/arduino/measure.htm) and feed with the Vref output an Op Amp as buffer to provide more current at that specific voltage. Of course R1 should be estimated again for this array (vcc 12V), to protect the diode.
My question is, am I right? or someone want to share with me another way to get a precise and low noise voltage reference.
Thanks in advance,
I'm working on a project and I have the need to use analog to digital conversions, I need to get a precise and low noise voltage reference, in order to get more accurate measurements of course.
After reading a litte bit, I've found a couple of things that could be useful (I think)
My idea is to use a RC low pass filter like this:
To filter a 12V voltage input (switched power supply), with a 20ohm resistor and 2000uF capacitor, which gives a cutoff frequency of about 4Hz (according this calculator http://sim.okawa-denshi.jp/en/CRtool.php).
Once filtered, feed a circuit like this:
The LM4040DIZ-4.1/NOPB (5) is a voltage reference diode (according http://www.skillbank.co.uk/arduino/measure.htm) and feed with the Vref output an Op Amp as buffer to provide more current at that specific voltage. Of course R1 should be estimated again for this array (vcc 12V), to protect the diode.
My question is, am I right? or someone want to share with me another way to get a precise and low noise voltage reference.
Thanks in advance,