Hi all,
I have some questions about filtering and amplifying a sensor signal.
lets say my temperature sensor outputs about 100mv analog output and is combined with noise.
so i need to remove the noise from the signal then amplify it so it can be read using microcontroller's A/D converter.
So i guess i need a one opamp configured as an active low pass filter (what topology should i use, salen key, RC low pass with buffer amp etc) and then another opamp configured as an amplifier with about gain of 25.
My questions are;
1.) how what is the most appropriate way to cascade the filter and the amplifier
sensor ----> low pass filter ----> amplifier
or
sensor ----> amplifier ----> low pass filter
or is there any method that combines thee filter and amp stage together so that single op amp can be used.
2.) what type of low pass filter should i use?
salen-key or RC filter with buffer amplifier
thank you
I have some questions about filtering and amplifying a sensor signal.
lets say my temperature sensor outputs about 100mv analog output and is combined with noise.
so i need to remove the noise from the signal then amplify it so it can be read using microcontroller's A/D converter.
So i guess i need a one opamp configured as an active low pass filter (what topology should i use, salen key, RC low pass with buffer amp etc) and then another opamp configured as an amplifier with about gain of 25.
My questions are;
1.) how what is the most appropriate way to cascade the filter and the amplifier
sensor ----> low pass filter ----> amplifier
or
sensor ----> amplifier ----> low pass filter
or is there any method that combines thee filter and amp stage together so that single op amp can be used.
2.) what type of low pass filter should i use?
salen-key or RC filter with buffer amplifier
thank you
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