On Jul 9, 2010, at 7:53 PM, Brian P. wrote:
You could try something like a switched filter bank as a preselector:
I was thinking of a discrete SMT type component, which I can mount on a
PCB board, those are really big.
That was something a quick google search found. Unfortunately, your
band-pass requirements are lacking. What types of channel bandwidths
do you want? How many channels? How much rejection are you looking
I was initially thinking of a BPF in the 400Mhz to 4000Mhz range. This
would interface with a LNA of the same band-width. However, I would like
to be able to digitally control the BPF, to be able to say filter
frequencies, prior to sending it to the LNA, e.g. 1800Mhz to 2200Mhz,
and then switch back to 400 to 600Mhz, etc.
Doing a google search, I came across FPAA (Field Programmable Analog
Arrays), and I was wondering if using a switched bank of capacitors and
resistors, would do the trick?
I found one company http://www.anadigm.com/
haven’t gone into the details of an FPAA, but was wondering if someone
else on this forum has looked into this type of thing before?
Could I potentially create my own externally switched capacitor &
resistor network, under control of a standard FPGA, to achieve the same