Nanoampere current reference needed

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pseudockb

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1na current reference

Hi, I need a nanoampere current reference that operates at a 1V supply voltage without using large resistors in megaohms. Have anyone of you ever designed one? Kindly share the information with me. Thank you.
 

nano ampere source

pseudockb said:
Hi, I need a nanoampere current reference that operates at a 1V supply voltage without using large resistors in megaohms. Have anyone of you ever designed one? Kindly share the information with me. Thank you.
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without large resistors?
maybe you need more than one stages with scaled current ouput.
 

nanoampere current source

Make the transisitors working at Sub-threshold region and you can get this kind of orders currents
 

current source nano ampere

How low are you looking for the resistors to be?

If you make a bandgap voltage reference at 40mV and place it over a 250kOhm resistor, you'll get a current reference at 120nA. Would this suffice?
 

50 nanoampere source

May be you can use the leakage current of a diode which is micro and nano amperes scale. Use it in reverse bias condition. But it is very depended to temperature.
 

100ua current reference

Hi |IAngel|, how did you design the bandgap reference voltage of 40mV you suggested without drawing large current not using large resistance in Mohms? Thanks.
 

1na current source

He is possible refering to a PTAT circuit, which is the core cell of a bandgap. But if you need only the small current a resistor of VT*ln(2)/IPTAT in total is enough.
 

circuit for nano ampere current measurement

try using the TI 100uA current source "REF200" here is its datasheet:

**broken link removed**

look in the application section they have a a simple 1nA current source circuit
 

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