Software Defined Radio Lec 3 – RF Front-End for SDR . Sajjad Hussain, MCS-NUST. Outline for Today’s Lecture. RF implementation issues Purpose of RF Front End Dynamic Range RF Receiver Front-End Topologies Enhanced Flexibility of RF Front-End with SDRs
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Compression Ratio (M)= change in input level in dB/ change in output level in dB
S (dBm)=Noise floor (dBm)+SNRmin(dB)
Noise floor (dBm)=10log(kTeB)+NFtotal dB
Best to have LNA placed as early in the system as possible because of its high gain