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Low noise voltage-to-current converter

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qslazio

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low noise voltage to current converter

I'm design a chip in which it need a voltage-to-current converter to converter my voltage signal(Vin) into current signal(Iout).
Now I choose the schematic as is shown below.
The problem may be noise issue.
There are both the resistor noise and the opamp noise.
I'm not sure whether the noise performance is very poor. Anyone has idea about this?
Is there any choice else for a lower noise V-to-I converter?

Thanks!
 

Do you simulate the circuit? How much is the noise?

Maybe you can add cap to reduce the noise
 

where should I add the cap? shunt with the resistor all the current output node?
Thanks
 

1. Low noise opa
2. Add cap between the gate and gnd of Mn1
 

why add cap between the gate and gnd of Mn1?
 

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