temperature compensated constant current source

[hemnath]

I need to feed a constant current to a pressure sensor. Is it possible to add temperature compensation for this circuit.

I found a note, link https://www.iitr.ac.in/departments/...nics/9. Design of Constant Current Source.pdf

Section: Active current source circuits with good temperature stability. does this circuit is better. should i use transistor or mosfet.

 

[Mahmoud_Sofy]

If you are designing an IC you can use bandgap reference circuit it can supply constant voltage and current over temperature, you can find out more about design procedure in the following book "CMOS Circuit Design Layout and Simulation, R J baker"
In discrete electronics you can find out some IC like "CL25" to feed your circuit with the required current

 

[hemnath]

Required 0.5mA constant current source. IC CL25 is 25 mA.

 

[danadakk]

LM334 ....

Regards, Dana.

 

[Mahmoud_Sofy]

Required 0.5mA constant current source. IC CL25 is 25 mA.

use two ICs in parallel

 

[KlausST]

Hi,

The schematic of post#1 should work.
Current may be adjusted by changing the resistor value (2k).

Klaus

 

[danadakk]

Actually it would be prudent to state your design goals, accuracy, drift, error
that you can tolerate for the current source.


Regards, Dana.