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A Linearization Strategy for Undersampling Analog-to-Digital Converters

Vallant, Georg; Dederer, Jochen; Epp, Michael; Schlecker, Wolfgang; Jondral, Friedrich K.

Abstract:
The ability of high performance Radar and Broadband Systems to detect weak targets in presence of strong interferers or clutter is given by their Spurious Free Dynamic Range (SFDR).
Although the Signal-to- Noise-Ratio (SNR) necessary for detection may be improved by well-known system processing gains, the dynamic range is ultimately limited by distortion terms caused by nonlinear behaviour of receiver components. The Software Defined Radio (SDR) paradigm assigns the Analog-to-Digital Converter a key role in receiver design. For systems using IF-Subsampling, linearity requirements place a heavy burden on the ADC, as SFDR signifcantly degrades with increasing input frequency.
As a consequence, the ADC can only be used at input frequencies fairly below its intrinsic full power bandwidth, restricting the systems IF placement.
This contribution discusses the possibility of processing ADC output data in the digital domain to achieve improved linearity. The Volterra series approach of nonlinear systems and its constrained variants are discussed. We will show in detail that for higher input frequencies, dynamic errors cause the harmonic ... mehr


Zugehörige Institution(en) am KIT Institut für Nachrichtentechnik - Communications Engineering Lab (CEL)
Publikationstyp Proceedingsbeitrag
Jahr 2011
Sprache Englisch
Identifikator KITopen ID: 1000026027
Erschienen in 2011 International Workshop on ADC Modelling, Testing and Data Converter Analysis and Design and IEEE 2011 ADC Forum, June 30 - July 1, 2011. Orvieto, Italy
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