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Multi-Band Implementation: Wisair's Contribution

Wisair's contribution on multi-band implementation issues for IEEE P802.15.3a Wireless Personal Area Networks (WPANs) working group.

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Multi-Band Implementation: Wisair's Contribution

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [TG3a-Wisair contribution on multi band implementation] Date Submitted: [5 May, 2003] Source: [Gadi Shor] Company: [Wisair] Address: [24 Raoul Wallenberg st. Ramat Hachayal, Tel-Aviv, ISRAEL] Voice: [+972-3-7676605] FAX: [+972-3-6477608], E-Mail: [gadi.shor@wisair.com] Re: [802.15.3a Call for proposal] Abstract: [Wisair’s contribution on multi band implementation issues] Purpose: [Response to questions from TG3a members] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Gadi Shor, Wisair

  2. Multi-BandImplementation Issues Gadi Shor, Wisair

  3. Contents • Multi band generator • Requirements • Band Plan • Design example • Design considerations • Lo leakage Gadi Shor, Wisair

  4. MultiBand Generator • Many possible architectures • Digital based • Analog Based • Combined approaches • Can be implemented using either SiGe or CMOS process • Low power consumption / Small die size Gadi Shor, Wisair

  5. Requirements • 3.79 nSec between pulses in 132 Mpps • Back to back pulses in 264 Mpps • Better than 20 dB in adjacent sub-band • Better than 25 dB in other sub-bands • Rejection of out of band harmonics (To simplify UWB filter requirements) Gadi Shor, Wisair

  6. Band Plan • Two frequency groups: A & B • 220 MHz frequency shift between groups • 440 MHz separation between sub-bands • 538 MHz sub-band bandwidth Gadi Shor, Wisair

  7. Design Example • Example of combined digital and analog implementation • Example is scalable with required pulse rate • Supports requirements for 132 Mpps and 264 Mpps • Covers lower set group A which allows up to 480 Mbps • To support group B additional division and multiplication is required • Future systems can use upper set with additional PLL and the same sub-band generator to support ~1 Gbps Gadi Shor, Wisair

  8. MultiBand Generator 132 Mpps 2mW 18mW DC 440 MHz Chip Rate Clk 1056 MHz 880 MHz MUX Sub-Band 5 : 1 5280 MHz 1320 MHz Generator 10mW 1760 MHz 12, 19.2, 20 MHz and others 9mW 5280 MHz MultiBand Generator Out SSB U/L • Power Consumption of 132 Mpps MultiBand Generator: 39 mW Gadi Shor, Wisair

  9. Sub-Band Generator 1056 MHz :5 4 x Pulse Rate 1760 MHz 880 MHz 5280 MHz DC :3 :2 440 MHz 1.8GHz LPF :2 1.0GHz LPF 1320 MHz 12, 19.2, 20 MHz and more :2 :2 SSB MultiBand 5280 MHz Generator Out - Sub-Band Generator - Simple, low power consumption design - Based on mature radio technology Gadi Shor, Wisair

  10. Single Sub-Band Spectrum Adjacent sub-band is ~23 dB down relative to main sub-band Gadi Shor, Wisair

  11. MultiBand Generator 264 Mpps(Back to Back Pulses) 3mW 18mW DC 440 MHz Chip Rate Clk 1056 MHz 880 MHz Sub-Band MUX Generator 5 : 2 5280 MHz 1320 MHz 10mW 1760 MHz 9mW 12, 19.2, 20 MHz and more 5280 MHz SSB U/L MultiBand Generator Out 9mW SSB U/L • Power Consumption of 264 Mpps MultiBand Generator: 49 mW Gadi Shor, Wisair

  12. 264 Mpps MultiBand Signal Switching is done when pulses amplitude is close to zero Realistic switching time has negligible effect on pulse shape Gadi Shor, Wisair

  13. Design Consideration • Design requires generation of I and Q components • Achieved through 50% duty cycle and divide by 2 • Out Of Band rejection filter (1.8 GHz) • On chip design for I and Q • Matching requirements are reasonable (e.g. 25 dB image rejection) • Switching effects minimized by use of dual SSB mixers and signal shape • Switching effects can be seen in the next slide Gadi Shor, Wisair

  14. Switching time Correlation factor 1st Side lobe 2nd Side lobe 1p 0.95 -23dB -30.3dB 100p 0.945 -22.8dB -30.1dB 500p 0.93 -20.8dB -26.7dB 750p 0.9 -20dB -26dB Switching effects • Negligible degradation under realistic switching time • 500pSec -> 0.1 dB relative degradation • 750pSec -> 0.2 dB relative degradation Gadi Shor, Wisair

  15. LO Leakage • LO leakage need to be considered to avoid problems with FCC mask • LO attenuation is better when LO goes through several mixers • Each mixer gives 25-30 dB • Only one real LO in the example design • Sub-band frequencies are not in-band signals • Allows traditional techniques as used for non-hopping LO suppression • Benefits from heterodyne like design (e.g. 2 mixers in a row) Gadi Shor, Wisair

  16. Summary • Multi band generator can be implemented in many ways • Requirements are set to allow reasonable implementation Gadi Shor, Wisair

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