liuguojia387
Junior Member level 1
How can I achieve a current reference with a low ppm if external resistance is NOT used?
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frankliner said:A voltage to current converter with an internal resistor and a ptat current sink (from the bandgap) in parallel. Then use final part trimming to center the current at room temp.
Here's a circuit by which you can achieve a medium TC of ≈ 1000 ppm/K = 0.1 %/K :liuguojia387 said:if trimming cannot be used, how should I do?
Depends on your need. Without external resistor or trimming, you probably won't achieve much better.liuguojia387 said:... 1000ppm is a little high?