© CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite.

Présentation au sujet: "© CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite."— Transcription de la présentation:

1 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 1 2007 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Alp OGUZ 1,2, Dominique MORCHE 1, Catherine DEHOLLAIN 2, Erkan Nevzat ISA 1,2 1 CEA-Leti, MINATEC Campus, Grenoble, France 2 École Polytechnique Fédérale de Lausanne, Switzerland 13.12.2010

2 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 2 2007 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Presentation Outline Problem definition Over-specified receiver Baseband block optimization Performance evaluation Conclusions

3 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 3 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Problem Definition Wireless receivers Usually utilized in mobile applications Operate on batteries or energy scavenging structures Power dissipation is imposed by the requirements Higher requirements Higher power dissipation Over-specified receiver dissipates excessive power POWER IS STRICTLY LIMITED

4 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 4 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers A conventional receiver has a fixed configuration High specifications due to worst case conditions Dynamic range requirement alters during operation A function of signal and blocker conditions Receiver becomes over-specified Over-specified Receiver

5 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 5 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Over-specified Receiver – cont.d SOLUTION: Adaptive Power Reconfigurability High Freq. Processing Frequency Translation Low Freq. Processing Antenna Digital Processing Sensing & Reconfiguring Processed Signal Analog Blocks Digital Blocks

6 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 6 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Trade-off between LPF and ADC High order filter Low resolution ADC Low order filter High resolution ADC Should be optimized for minimum total power Results will indicate the dominant power consumer Requires high-level LPF and ADC power models Baseband Block Optimization SNDR Filter OrderSNDR

7 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 7 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Baseband Block Optimization – cont.d POWER MODELS Normalized real data points from the literature Up-to-date reconfigurable Active Gm-RC filter [Ozgun2006] Up-to-date SAR ADCs are used [Nuzzo2009, Harpe2010, C.Liu2010, W.Liu2010] Regions between the data points are extrapolated Constant capacitance scaling assumed while normalizing BW (implies P ~ BW)

8 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 8 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Baseband Block Optimization – cont.d Optimization is done for ZigBee receivers Filter power dominates Total power changes between 24 μW and 4.197 mW Filter order changes between 0 and 3 Filter DR changes between 32.85 dB and 85.37 dB

9 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 9 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Average power dissipation depends on operating schedule Statistical data is hard to obtain An illustrative scenario is derived Blocker source at the center Signal power is constant Assumed P ~ Performance Evaluation The time weight of n th worst operating condition 1 R2R2 ω n = ω 1. (1.112) n-1

10 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 10 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Time weights calculated using the formula With adaptive power reconfigurability, P av = 115.87 µW Without adaptive power reconfigurability, P av = 4.197 mW Performance Evaluation – cont.d Power reduction by a factor of 36 (15.6 dB)

11 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 11 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Conclusions Investigated the effect of using adaptive power reconfigurability concept in wireless receivers Optimized the baseband block of a ZigBee receiver for minimum total power Filter should be reconfigurable, ADC not necessarily Illustrative scenario shows up to 36 times improvement is possible in average power dissipation

12 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 12 2007 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers Innovation for industry Thanks for your attention…

13 2007 © CEA 2008. Tous droits réservés. Toute reproduction totale ou partielle sur quelque support que ce soit ou utilisation du contenu de ce document est interdite sans lautorisation écrite préalable du CEA All rights reserved. Any reproduction in whole or in part on any medium or use of the information contained herein is prohibited without the prior written consent of CEA 13 Adaptive Power Reconfigurability for Preventing Excessive Power Dissipation in Wireless Receivers References [Ozgun2006] M. T. Ozgun, Y. P. Tsividis, and G. Burra, Dynamic power optimization of active filters with application to zero IF receivers, IEEE J. Solid State Circuits, vol. 41, no. 6, pp. 1344 1352, Jun. 2006. [Nuzzo2009] P. Nuzzo et al., A 6 bit 50 MS/s threshold configuring SAR ADC in 90 nm digital CMOS, Symposium on VLSI Circuits, 2009, pp. 238 239. [Harpe2010] P. Harpe, C. Zhou, X. Wang, G. Dolmans, and H. de Groot, A 30fJ/conversion step 8b 0 to 10MS/s asynchronous SAR ADC in 90nm CMOS, Int. Solid State Circuits Conf. Digest of Technical Papers, Feb. 2010, pp. 388 389. [C.Liu2010] C. C. Liu et al., A 10b 100MS/s 1.13mW SAR ADC with binary scaled error compensation, Int. Solid State Circuits Conf. Digest of Technical Papers, Feb. 2010, pp. 386 387. [W.Liu2010] W. Liu, P. Huang, Y. Chiu, A 12b 22.5/45MS/s 3.0mW 0.059mm² CMOS SAR ADC achieving over 90dB SFDR, Int. Solid State Circuits Conf. Digest of Technical Papers, Feb. 2010, pp. 380 381.