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Dynamic range extension for HF receiver frontend

: Ulbricht, G.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Communications Society:
IEEE Radio and Wireless Symposium, RWS 2013. Proceedings. CD-ROM : 20-23 January 2013, Austin, Texas, RWW 2013
New York, NY: IEEE, 2013
ISBN: 978-1-4673-2929-3 (Print)
ISBN: 978-1-4673-2931-6 (Online)
ISBN: 978-1-4673-2930-9 (CD-ROM)
Radio and Wireless Symposium (RSW) <2013, Austin/Tex.>
Radio and Wireless Week (RWW) <7, 2013, Austin/Tex.>
Fraunhofer IIS ()

This paper presents a new HF frontend architecture with two or more parallel receiver branches. Each branch applies a different gain to the input signal before feeding it to the analog-to-digital converters. One branch is designed for best sensitivity; the others are almost identical but driving the analog-to-digital converter with reduced level. For further processing in the digital domain, the receiver selects the branch with the best sensitivity but not saturating its analog-to-digital converter for each sample. Consequently, the receiver is able to perform an automatic gain control on a sample by sample basis. The paper will discuss the dynamic range improvement with different interfering signals.