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Design >> Analog Design >> How to reduce noice figure?
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Message started by richloo on Jan 26^th, 2005, 5:41am

Title: How to reduce noice figure?
Post by richloo on Jan 26^th, 2005, 5:41am

Hi guys, i am having too much NF(32dB) in my gm-C filter design. Any suggestion to reduce the NF? any trade-off?
thanks in advance!

Title: Re: How to reduce noice figure?
Post by 101questions on Jan 27^th, 2005, 12:09pm

Well, Gm-C filters are not a good choice for low noise designs.
So what you get is somewhat expected.
If you insist on using Gm-C architecture, all I can suggest is to increase gm and C, if thermal noise is dominant, or mos areas if 1/f one is dominant.

Title: Re: How to reduce noice figure?
Post by richloo on Feb 7^th, 2005, 5:58pm

Thanks 101 for ur reply. The NF that i mentioned is using SP analysis. However, if i use conventional method to find noise rms,SNR, i get my NF around 4dB. I m not quite believing it., any comment?

thanks in advance.