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Study of Optoelectronic Sampler Linearity for Analog-to-Digital Conversion of RF Signals

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4 Author(s)
Delord, J.-M. ; IMEP-LAHC, Univ. de Savoie, Le Bourget, France ; Roux, J.-F. ; Coutaz, J.-L. ; Breuil, N.

Photoconductive sampling of 10-GHz radio- frequency (RF) signal is demonstrated using interdigitated photoswitches made from low-temperature grown GaAs. We study the linearity of the device for RF input power ranging from -3 to 20 dBm. For moderate levels, the sampler shows a spurious-free dynamic range (SFDR) better than 40 dB. For the largest values, it exhibits a nonlinear response that deteriorates both SFDR and resolution. This nonlinearity is attributed to drift velocity saturation in the semiconductor material.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 19 )

Date of Publication:

Oct.1, 2009

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