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Re: [Discuss-gnuradio] Programmable band-pass filters
From: |
Elvis Dowson |
Subject: |
Re: [Discuss-gnuradio] Programmable band-pass filters |
Date: |
Fri, 09 Jul 2010 21:46:12 +0400 |
HI Marcus,
On Jul 9, 2010, at 9:36 PM, Marcus D. Leech wrote:
> You should know that any filter you place in front of an LNA needs to have a
> ridiculously low insertion loss in to not severely degrade the noise figure
> if the LNA
>
> It's likely that any switchable filter will have unacceptably high insertion
> loss
>
> A better approach is to use a first LNA with modest gain and good OIP3 and
> P1dB then your filters then another low noise stage
The following diagram represent the various stages for a direct conversion RF
front-end.
Pasted Graphic.pdf
Description: Adobe PDF document
The part that I would like to make programmable are the 2 BPF stages before
LNA1 and LNA2.
Any suggestions?
Best regards,
Elvis Dowson