Happy New Year to One and All.
I'm using an amplified ADC input circuit very similar to the one in Nigels tutorials, but feeding into the 10 bit adc of a 18f4520 chip.
The signal, for test purposes, is 0 - 5v and this converts fine, however the lowest 1.25v and the top 1.25v of the signal are effectively useless for my needs. Original signal source approx -50mv to +50mv.
If I could loose these parts of the voltage and then amplify the resultant 2.5 upto 5 v , I could achieve twice the resolution on the range I'm really interested in.
My problem is how can I do this ? - is there an easy way to limit the signal in this way ?
thanks
Richard
I'm using an amplified ADC input circuit very similar to the one in Nigels tutorials, but feeding into the 10 bit adc of a 18f4520 chip.
The signal, for test purposes, is 0 - 5v and this converts fine, however the lowest 1.25v and the top 1.25v of the signal are effectively useless for my needs. Original signal source approx -50mv to +50mv.
If I could loose these parts of the voltage and then amplify the resultant 2.5 upto 5 v , I could achieve twice the resolution on the range I'm really interested in.
My problem is how can I do this ? - is there an easy way to limit the signal in this way ?
thanks
Richard