Noise figure and noise temperature are related quantities. Which one is used depends on the application and the context. A noise figure and noise temperature calculator is now available on the Signal Processing Group website,  under complementary items for interested users. For quick reference here is a table of converted values.

Last post dealt with MOSFET flicker noise. See:http://www.signalpro.biz/wordpress/analog-asic-design-a-mosfet-flicker-noise-calculator/. The calculator allows the user to calculate the flicker noise of a MOSFET using a relatively simple noise equation. This also leads to a rather simple rule and expression for the calculation of flicker noise. The expression states: rms noise/root Hz = AN/WL. Here W is the width of the MOSFET and L is the length of the MOSFET. AN is constant AN can be calculated by using the calculator. This allows simple calculations for various MOSFETs based on their gate area. The message is clear. If you want a low flicker noise then increase the gate area of the MOSFET. The calculator can be accessed from the Signal Processing Group Inc., website. 

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1/f noise in MOSFETs is a subject for continual study. Multiple noise models have been derived and studied. Each of these have some advantages and disadvantages. At SPG we have used a simple model of 1/f MOSFET noise for some time. It has served its purpose in allowing us to at least estimate the 1/f noise for our design purposes. By using some kind of thumb rule, most appropriate to a particular design it is quite possible to use this model effectively. The model is presented below with credit to the source. The calculation based on this model has also been coded into a javascript that is available for the user. The original author of the paper is: Chorng – Kuang Wang. This model is further described in a Memorandum No. UCB/ERL M79/78 issued by UC Berkeley. Please visit the Signal Processing Group Inc., website to acces the script. The link can be found under :”Complementary” items.

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