Characterization of BandPass Delta Sigma Modulators in Wireless Transceivers Using Parameter Identification

David Gautier (1) , Smail Bachir (2) , Claude Duvanaud (2)

1 LAII [Poitiers] - Laboratoire d'automatique et d'informatique industrielle [EA 1219]
2 SIC

In this paper, a method to study and characterize a single-loop, cascaded and 1-bit Band-Pass Delta Sigma modulator for digital transmitter is presented. This technique is based on a combination of digital filter simulation and nonlinear optimization of signal-to-quantization noise. The optimal coefficients of modulator structure are achieved by minimization of a quadratic criterion based on prediction error between desired digital filter and noise transfer model. To demonstrate the effectiveness of this approach, simulated results for a sixth order cascaded structure for WCDMA Band-1 standard are presented. Spurious and ACLR improvement could be achieved for this standard with the proposed characterization technique.

Mots clés: Delta-sigma modulation; Digital modulation; Feedback; Multiaccess communication; Noise shaping; Parameter estimation; Radio frequency; Radio transmitters; Signal to noise ratio; Transceivers

Domaines: Electronique; Automatique / Robotique

David Gautier, Smail Bachir, Claude Duvanaud. Characterization of BandPass Delta Sigma Modulators in Wireless Transceivers Using Parameter Identification. Conference on Wireless and Mobile Communications ICWMC'09., Aug 2009, Cannes, France. pp.396 - 400, ⟨10.1109/ICWMC.2009.73⟩. ⟨hal-00782507⟩