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.
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The part that I would like to make programmable are the 2 BPF stages before LNA1 and LNA2. Any suggestions? Best regards, Elvis Dowson
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