How to measure the output noise for a TIA circuit

[dog1357]

I am doing a TIA circuit and I am going to measure the output noise of a TIA circuit.

I see suria3 put this below, he seems get the output voltage noise and then divided by the transimpedance gain Rf, but I donot know how to measure the output voltage noise, is it using a spetrum analyzer to get the a number like 1nV/√Hz? or any other equipment to measure it? Thank you very much!

Hi Guys,

I have question here regarding the Input Referred Noise Calculation for my Transimpedance Amplifier Design of my research project. I measured the total input equivalent noise and it showed me about 15pA/√Hz . This is the value i got over frequency at 1Ghz since im designing for 1.25Gbps. Now my question, how do I convert this value to nA RMS. My data operating rate is 100Mbps to 1.25Gbps and my low cutoff frequency is about 50kHz. By having this values, how do I make use of them. Your feedback is very much appreciated.

Thanks,
Suria

from

 

[dog1357]

I guess a scope will do the job, find it one these two papers:

[1] L. Chih-Fan and L. Shen-Iuan, "40 Gb/s Transimpedance-AGC Amplifier and CDR Circuit for Broadband Data Receivers in 90 nm CMOS," Solid-State Circuits, IEEE Journal of, vol. 43, pp. 642-655, 2008.

[2] J. S. Weiner, J. S. Lee, A. Leven, Y. Baeyens, V. Houtsma, G. Georgiou, Y. Yang, J. Frackoviak, A. Tate, R. Reyes, R. F. Kopf, W. J. Sung, N. G. Weimann, and Y. K. Chen, "An InGaAs/InP HBT differential transimpedance amplifier with 47 GHz bandwidth," in Gallium Arsenide Integrated Circuit (GaAs IC) Symposium, 2003. 25th Annual Technical Digest 2003. IEEE, 2003, pp. 245-248.



best regards
duan Lian