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Giving an input DC bias current for an IC (Read 197 times)
Venky_analog
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Analog Design is my
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TX, USA
Giving an input DC bias current for an IC
May 31st, 2017, 6:25pm
 
Hi,

I am trying to give the DC bias current to an IC from an external source. The way I am generating this current is by using a potentiometer structure shown below.



By changing both VDD (tunable) and R1 (potentiometer), I can change the current. The VDD comes from an LDO and hence it's kind of accurate.

The thing is I placed another series resistor R2 to reduce the variations in the current due to possible variations in the potentiometer, as I heard potentiometers are very sensitive to their environments and tend to change with time a lot.

My quesiton is if I keep R2 like 25% of R1, would it be good enough? Also, is this a good way of generating current externally for biasing circuits inside an IC?

Thanks in advance
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