How to generate a reference current of 5uA?

[surianova]

hi all!

i need to generate a reference current of 5uA. This 5 uA must indepedent of power supply, process and temperature. Any idea or journal i can refer to generate this current? Thanks in advance.

 

[yxo]

Reference current

There are four type of current sources. They are proportional to absolute temperature (PTAT); gm-matching; temperature independent;and currents with a negative temperature coefficient (TC). Find in google any of this current source. Or
https://www.freepatentsonline.com/

 

[surianova]

Re: Reference current

There are four type of current sources. They are proportional to absolute temperature (PTAT); gm-matching; temperature independent;and currents with a negative temperature coefficient (TC). Find in google any of this current source. Or
https://www.freepatentsonline.com/

but all these is temperature dependence.

 

[kumar123]

Re: Reference current

hi all!

i need to generate a reference current of 5uA. This 5 uA must indepedent of power supply, process and temperature. Any idea or journal i can refer to generate this current? Thanks in advance.

Chk if this post if it can help you

 

[DenisMark]

Re: Reference current

It's very difficult in analog design to obtain PVT stable current reference with high tolerance.
U can make bandgap reference to get stable voltage with 2-3% tolerance (without trimming). To make stable current u can use off-chip resistor. It's one way.
The second one is using on-chip low TC resistor with trimming.
U can make voltage and current references separately or u can make compact circuit.

 

[surianova]

Re: Reference current

It's very difficult in analog design to obtain PVT stable current reference with high tolerance.
U can make bandgap reference to get stable voltage with 2-3% tolerance (without trimming). To make stable current u can use off-chip resistor. It's one way.
The second one is using on-chip low TC resistor with trimming.
U can make voltage and current references separately or u can make compact circuit.

yes, thank you.i try already.. i found out it is quite ok to get constant current across power supply and temperature. But quite hard to get across process especially SS and FF.. i think that one might need trimmimg of resistors.

 

[jluhzw]

Re: Reference current

Hello surianova
you can refer this paper in the following site, maybe it is useful.


I am also designing a current reference with invariant for process and temperature.
I also think it is not very difficult for design a current reference with invariant for
temp and power supply.

 

[babbage]

Reference current

PTAT current+NTAT current

 

[codec]

Re: Reference current

Consider I1=Vbe/R, I2=VT/R and then mix I1 and I2 with proper coefficients

 

[wolf001]

Reference current

A ideal refrence current,;babbage
, Can the PTAT current+NTAT current realize it?

 

[gavin168]

Reference current

Is there any good idea to make current reference with indenpendence of Temp and Process. all component should be on-chip. It is better to not use resistor, because it is too hard to make a precise resistor in silicon.

 

[anilshrirao]

Re: Reference current

since its very low current and need stabilization for various parameter. u must use band gap reference to design design current mirror....

 

[mvishwakreddy]

Re: Reference current

refer to sixth chapter in analog integrated circuit by ken martin

 

[kumar123]

Re: Reference current

hi all!

i need to generate a reference current of 5uA. This 5 uA must indepedent of power supply, process and temperature. Any idea or journal i can refer to generate this current? Thanks in advance.

chk if these can help you

 

[yxk]

Re: Reference current

hi all!

i need to generate a reference current of 5uA. This 5 uA must indepedent of power supply, process and temperature. Any idea or journal i can refer to generate this current? Thanks in advance.

chk if these can help you

thanks

 

[Sadegh.j]

Re: Reference current

Use a band gap reference circuit for your supply.