A self-calibration scheme for Extended Frequency-Band-Decomposition sigma-delta ADC

Philippe Benabes (1) , Ali Beydoun (2)

1 E3S - Supélec Sciences des Systèmes
2 COMELEC - Département Communications & Electronique

Frequency-Band-Decomposition (FBD) is a good candidate to be used to increase the bandwidths of ADC converters based on sigma-delta modulators for software and cognitive radio applications where we need to convert wide bandwidths. Each modulator processes a part of the band of the input signal which is then passed through a digital filter. In the case of large mismatches in the analog modulators, a new solution, called Extended Frequency-Band-Decomposition (EFBD) can be used. As an example, this solution can allow for a 4 % error in the central frequencies without significant degradation of its performance when the digital processing part is paired with the analog modulators. A calibration of the digital part is thus required to reach these theoretical performances. This paper will focus on a self-calibration algorithm for an EFBD. The algorithm helps minimize the quantization noise of the EFBD and helps to flatten the signal transfer function.

Mots clés: sigma-delta · bandpass · analog-to-digital conversion · filter bank · frequency-band-decomposition · self-calibration

Domaines: Electronique; Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Philippe Benabes, Ali Beydoun. A self-calibration scheme for Extended Frequency-Band-Decomposition sigma-delta ADC. Analog Integrated Circuits and Signal Processing, 2010, 62 (3), pp.269-280. ⟨hal-00464857⟩