Was wondering what to you think about the following conditioning circuit for an AD590 (250uA...323uA to 0V...3V):
I'm using LM358 as op.amp. and 1% resistors.
The resistors are all in the range 1k...10k in order to minimize DC errors due to Ibias. Is correct?
Any suggestion (to reduce Ibias' errors) are welcomed.
Thanks in advance
rossi skrev:
The gain is about 30 times.
Vos =3D 7mV -> 200mV output error Ioffset =3D 150nA -> 150uV error voltage -> 5mV error on output
So offset currents isn=B4t your consern - offset voltages is. You can get around this by using a better amp of adding a 10mV offset to the input and do calibration routines in your microcontroller or whatever
Regards
Klaus
Klaus Kragelund ha scritto:
Could you suggest me an op.amp. with lover VOS, not so expensive, single supply? Thanks
TLC2274 is better
Regards
Klaus
given the incredible variety of op amps and instrumentation amps out there, i don't dare make a recommendation for so undefined a task. can you actually specify a Vos and Vos drift, tempco etc? how about minimum gain, CMRR, bandwidth, accuracy, settling time to specified accuracy, max price etc?
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