1. Integrated Solutions for 5G Frequency-Division and Full Duplex Systems
Prof. Emanuel Cohen
Students: Nimrod Ginzberg, Yanir Schwartz, Iliah Konstantinovsky, Roy Weiss, Pavel Vilner, Tomer Gidony
Technion
High Frequency Integrated Circuits

2. Outline Introduction and Motivation TX+TX systems
TX+RX systems – flexible FDD
Full Duplex
Summary & Conclusion

4. Capacity enchantments options in existing spectrum :
Carrier aggregation at TX and RX (TX+TX, RX+RX)
Flexible Frequency division multiplexing FDD (TX+RX)
Full duplex : Simultaneous TX and RX at same frequency.

5. The Multi-band cellular radio

6. The Carrier Aggregation Challenge
Intra-band contiguous CA
Intra-band non-contiguous CA
From when do we have carrier aggregation?
Intra band – within the same band two channels.
Inter bands – between two different bands.
Coming from operators demand as they release 2G bands looking ahead into 4G.
Still having tough time to be presented into the market but it is on the trand
Inter-band CA

7. FDD system TX + TX

8. Diplexer-Free Dual-Band Transmitter for Carrier Aggregation Signals

9. Digital Predistortion on Concurrent Noncontiguous Transmitters
Using 2D Piecewise Vector Decomposition
Tomer Gidoni, Emanuel Cohen ”Digital Predistortion on Concurrent Noncontiguous Transmission Using 2D Piecewise Vector Decomposition”. –COMCAS17

10. Simulation and testing of TX+TX
Nimrod Ginzberg, Emanuel Cohen ” Linearization Technique of Diplexer-Free Transmitter for Carrier Aggregation Signals” - COMCAS17

11. FDD systems TX + RX

12. Multi-band (TX+RX) FDD Directions

13. Potential Integration of Tunable Diplexer “Splitter” with high isolation
Mohyee Mikhemar ”Multiband RF Antenna Duplexer on CMOS Design and Performance” – JSSC 2013

14. Mm-Wave Autotransformer Performance
Wideband isolation >30dB for 25GHz BW around 60GHz
IL about 1-1.5dB above theoretical limit
Tuning elements overcome process variations

15. N Path Filter Topology
Downconvert + LPF + Upconvert = BPF

16. Potential solution (TX+RX)
RX Npath filter
Wideband noise from TX leaks to RX
High swing TX reaches RX
Create a notch for the noise from TX to RX
Using Npath filter design

17. Npath Tunable Duplexer Implementation

18. N-path Tunable Duplexer simulation resultsTX RX
Tx [dBm]
Isolation [dB]
IL [dB]
One Resonator
Two Resonators
Up to 24dBm with no filter degradation

19. Large array & FDD challenge
Low cost dynamic backhauling
Create a phased array with shared TX/RX antenna space

20. FDD antenna research Interleaved TX-RX arrays example: DGS example:
Cross pol isolation with scan

21. Interleaved TX-RX Performance Limit inf Array
Pavel Vilner, Emanuel Cohen ” Power Balance Analysis of an Infinite Equispaced Linear Array Composed of Two Alternating Types of Elements”. – COMCAS17

22. Full Duplex (FD) system Simultaneous Transmit & Receive (STAR)

23. Full-Duplex (FD) Wireless

24. Full-Duplex Challenges
Leakage paths require large number of taps
Calibration Accuracy
Amp+/-0.1dB
Phase +/-0.5deg NF

25. J. Zhou et al, ISSCC 16

26. “Active” Circulator based on 90o NRPS*
Ferrite Circulator
Large ( typically >1x1 cm2 )
Cannot be integrated into an IC
N. Reiskarimian and H. Krishnaswamy, nature communications 16
Assuming a signal is injected from the transmitter
Constructive interference at the Ant port 1 2 3
(-90o) 1 2 3
(-90o)
Destructive interference at the Rx port
(*) Only the LO Driver consume power
*Non-Reciprocal Phase Shifter

27. Integrated Circulator Improved Performance
NRPS Test-Chip
High impedance loads at high LO harmonics are used to reduce insertion losses
Designing low PN LO (specifically, eliminating any uncorrelated PNs) to reduce NF
Roy Weiss, Emanuel Cohen ” Low Loss Integrated N-Path-Filter-Based Circulator” COMCAS17

28. 4-Phase-Pulser Block Diagram
clk1
clk2
clk3
clk4
CLK
0-180⁰ Splitter
Frequency Divider
CLKp
CLKn I+ Q+ I- Q- VC VB
(1)
(2)
(3)
Monte Carlo Sim.
Retiming for reduced jitter
Timing alignment for process robustness
Configurable fast divider for 1-12GHz operation

29. Summary and Conclusions
TX+TX system based on 2D DPD and analog injection can reduce cross modulation and intermodes
TX+RX system based on EBD can work up to mmw and show wideband isolation (20dB for GHz range) – IL about dB
TX+RX system based on integrated Npath circuits can achieve more than 20dB isolation with around 1-2dB of IL penalty for few GHz range
Full duplex systems can be implemented based on integrated Npath circulator with IL of ~1dB and 20dB isolation at 2GHz

30. Thank You