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Reconfigurable complex digital Delta-Sigma modulator synthesis for digital wireless transmitters

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6 Author(s)
Nzeza, C.N. ; Integrated Circuits Design Group, IEMN/ISEN, Lille ; Flament, A. ; Frappe, A. ; Kaiser, A.
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Digital generation of radio-frequency signals is a key concept of software defined radio. One of the main difficulties for multi-standard transmitter design based on delta-sigma (DeltaSigma) modulators is to respect the different specifications in terms of out-of-band spurious emission. Focusing on the TX path of a UMTS/DCS1800 mobile phone, we propose hereinafter an efficient method aiming at synthesizing a complex 5th-order DeltaSigma modulator which respects the targeted standards spurious specifications. The use of a complex noise transfer function allows a better optimization of noise shaping. In addition, this approach eases the reconfiguration of the modulator, and, it is a powerful tool for all order (real and complex) DeltaSigma modulators synthesis, as it will be illustrated.

Published in:

Circuits and Systems for Communications, 2008. ECCSC 2008. 4th European Conference on

Date of Conference:

10-11 July 2008

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