[Moved]: problem with noise in designing transimpedance amplifier

hi I am simulating a transimpedance amplifier in the paper given below. I can get the gain and bandwidth to the desired value using the specified power consumption given in the paper. the only thing that doesn't match the paper is noise. I averaged the noise from 10k to 14G(two times more than bandwidth) because the paper showed the input referred noise in this range. I measured the average current noise density in this range and its two times more than what is given in the paper. and I have another problem with noise. in the paper says the integrated input referred noise current is 1.27 µArms. i don't see the relation between this value and noise current density if we multiply current noise density to sqrt of bandwidth or sqrt of 2*bandwidth we get a different value. i integrated the noise current density with cadence calculator i get 150*10^-3 . it would be really good if you could help me thanks in advance.



https://ieeexplore.ieee.org/document/7870132/?reload=true

Re: problem with noise in designing transimpedance amplifier

Are you using exactly the same foundry with paper's one ?

Re: problem with noise in designing transimpedance amplifier

I'm sorry i don't know what foundry means but if you mean technology i used 0.13 technology which is used in the paper.if your referring to the company of technology it is not given in the paper(i used tsmc 0.13 ) .The sizing of transistors is not given in the paper and i got that by simulation.

Re: problem with noise in designing transimpedance amplifier

ultrasonic.1991 said:

I'm sorry i don't know what foundry means but if you mean technology i used 0.13 technology which is used in the paper.if your referring to the company of technology it is not given in the paper(i used tsmc 0.13 ) .The sizing of transistors is not given in the paper and i got that by simulation.

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If the technologies are different, the results will also be different.

Re: problem with noise in designing transimpedance amplifier

no technologies are not different

Re: problem with noise in designing transimpedance amplifier

Are you using a different capacitive load at the input than what was measured/simulated in the paper? Larger capacitance on the input of a TIA will cause higher noise in the output. The input node capacitance plays a large role in TIA noise generation.

Also, to clarify what BigBoss was asking: Even if the technology node (0.13u) is the same, different foundries and processes can have differing noise performances.