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Transimpedance Ampifier - Input Referred Noise Current Density

growingmind

Hello,

I am designing a TIA in Cadence, input is current (an idc component), output is voltage (a capacitive load)

I want the input referred noise current density in RMS.

I do a noise analysis. In the noise analysis, I select the input as my input current, and the output as my output voltage node, referenced to ground.

I run the noise analysis. When I go to Print->Noise Summary, I select the bandwidth to be 1Hz to my 3dB Frequency of my TIA. Then, I get the total input referred noise as a number. I select "V" as my unit.

Is this the Input Referred Noise Current Density in RMS ?

I want to eventually get the average input referred noise current density when I divide this RMS value generated by Cadence by the square root of the 3db frequency of my TIA.

Is this correct, or should I do this in S Parameter analysis ?

Thanks.

Parents

  • Hello all,

    I  have the same question. I'm designing a chopper amplifier .My design input is current and output is voltage. I have to  use PNOISE  analysis. For PNOISE analysis i use PORT instead  common current source in input and In output. Pnoise analysis give the input referred noise in V/sqrt(Hz) while input is in current and output is in voltage. can someone please guide me on how to compute the input refered noise in A/sqrt(Hz) in Pnoise analysis? 

Reply

  • Hello all,

    I  have the same question. I'm designing a chopper amplifier .My design input is current and output is voltage. I have to  use PNOISE  analysis. For PNOISE analysis i use PORT instead  common current source in input and In output. Pnoise analysis give the input referred noise in V/sqrt(Hz) while input is in current and output is in voltage. can someone please guide me on how to compute the input refered noise in A/sqrt(Hz) in Pnoise analysis? 

Children
  • in reply to sahand1400

    OK, this is rather similar to your other post, and is also breaking the forum guidelines.

    The Noise Summary form still shows the results rather ambiguously - input referred noise is actually in A^2/Hz (if you picked V^2 on the noise summary form), or in A/sqrt(Hz) (if you picked V on the noise summary form). The Direct Plot form (as I mentioned in the other post) has been fixed (I didn't check precisely when it was fixed). So it looks as if part of my CCR (2114281) hasn't been fixed yet (the noise summary doesn't clearly show the correct units for input referred noise if the input was a current and output a voltage, but the numbers are right).

    As I mentioned in your other post, asking this in a new thread with sufficient information would rather help pinpoint precisely what you're running and which version.

    Andrew

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