1. May 2003
Project: IEEE P 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: [ ] FAX: [ ],
Re: [ a 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 P 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 P
Gadi Shor, Wisair

2. Multi-Band Implementation Issues
<month year>
doc.: IEEE <doc#>
Multi-Band Implementation Issues
Gadi Shor, Wisair
<author>, <company>

3. Contents Multi band generator Requirements Band Plan Design example
May 2003
Contents
Multi band generator
Requirements
Band Plan
Design example
Design considerations
Lo leakage
Gadi Shor, Wisair

4. MultiBand Generator Many possible architectures Digital based
May 2003
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
May 2003
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
May 2003
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
May 2003
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
May 2003
MultiBand Generator 132 Mpps
2mW
18mW DC
Chip Rate Clk 1056 MHz
440 MHz
880 MHz
MUX
Sub-Band
5280 MHz
5 : 1
Generator
1320 MHz
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. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
May 2003
Sub-Band Generator
880 MHz :2 -
1.8GHz LPF
5280 MHz
1760 MHz
12, 19.2, 20 MHz
and more
1320 MHz :3 :5
440 MHz
Sub-Band Generator
MultiBand
Generator Out
4 x Pulse Rate
SSB DC
1056 MHz
1.0GHz LPF
- Simple, low power consumption design
- Based on mature radio technology
Gadi Shor, Wisair
<author>, <company>

10. Single Sub-Band Spectrum
May 2003
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)
May 2003
MultiBand Generator 264 Mpps (Back to Back Pulses)
3mW
18mW DC
Chip Rate Clk 1056 MHz
440 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. May 2003
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
May 2003
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. May 2003
Switching effects
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
Negligible degradation under realistic switching time
500pSec -> 0.1 dB relative degradation
750pSec -> 0.2 dB relative degradation
Gadi Shor, Wisair

15. May 2003
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 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
May 2003
Summary
Multi band generator can be implemented in many ways
Requirements are set to allow reasonable implementation
Gadi Shor, Wisair