Phan Tuan Anh Dec. 2010 Reconfigurable Multiband Multimode LNA for LTE/GSM, WiMAX, and IEEE...

Phan Tuan Anh

Dec. 2010

Reconfigurable Multiband Multimode LNA for LTE/GSM,

WiMAX, and IEEE 802.11.a/b/g/n17th IEEE ICECS 2010, Athens, Greece.

22Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM

Introduction

Design Approach

Conclusions

ContentContent

Proposed Circuitry

Simulation Results


Radio standards: - Rapid evolution next generation radio with WiMAX (3.5G), LTE (4G) along with existing GSM (2G), WLAN IEEE 802.11 family .. Reconfigurable Radio…

- SoC, SiP, MEMs .. - High demanding for new single device to combine multiple standards, working with different networks for various applications.

CMOS is technology of Choice

IntroductionIntroduction


Fig. 1 Source: Bob Iannucci, Nokia 2008

- Required to support multi standards same chip - Reconfigurable, multiband multimode for various standards Tunable input matching ?- High level of integration, reduce cost- Maintain the same performance as single radio

Next generation: Reconfigurable Radio


LNA is the first block in Rx RF front-end - Determine the radio condition: Freq channel, provide Gain, suppress Noise to improve channel sensitivity and selectivity - Input matching for various bands - Reconfigurable over the band for various applications: LTE/GSM at 1.9GHz, WLAN/Bluetooth 802.11.b/g/n at 2.4GHz, WiMAX at 3.5GHz, 802.11.a/n WLAN at 5.2GHz.

Ultimate Goal: Low cost, low power, high performance using CMOS technology. Ready for any existing wireless standards

Design Challenges


Reconfigurable LNA

Design Approach

Fig. 2. Reconfigurable Principle of the LNA

- Selection solely or jointly a bank of cascode LNAs


+ Switching CG Devices for various band configuration of cascode LNA

Proposed Multiband LNA

Fig. 3. Schematic of the proposed multiband LNA


+ Input matching - Inductive degenerative input matching - As M0 varies, LG (~10nH) is varied for better matching. - Bit D1-4 controls the selection of corresponding band.

+ Load and Buffer - Inductive load LL(4-8nH) and source follower buffer are shared - Reduce the chip size - Different bands are optimized with its own output Cap bank C1-4

+ Gain control - Selection of Gm’s device size M0

- Optimize for power consumption

Proposed Multiband LNA: Features


Input matching and Output matching

Simulation Results: S11 and S22

Fig. 4. S11 and S22 for different standards of proposed LNA

- Inductive degeneration Ls is usedfor good NF-LG is needed for better matching as M0 size varying for various bands- Good S11 and S22 achieved


Simulation Results: S21 and NF

Fig. 5. Typical Gain mode and NF of different standards

- Good gain over different bands- NF is quite good at low frequency and reasonable at high band


Gain Tuning

Simulation Results: Gain variable

Fig. 6. Variable gain function over different bands

- Varying Gm by selecting bank of M0 devices for sizing and bias current.- From low to maximum gain mode, 10dB range.


Linearity at various bands

Simulation Results: Linearity

Fig. 7. Linearity at different bands in Low and High gain modes

- High gain mode shows moderate IIP3

- Power consumption is3/3.4/3.4/5.3mW at 1.9/2.4/3.5/5.2GHz bands, respectively.

- 1.5V supply @ 0.18um CMOS


Performance summary and comparison

Performance Summary

Freq. (GHz)

Power (mW)

S21 (dB)

S11 (dB)

NF (dB) IIP3Tech.

μmTopology

This work 1.9-5.2 3-5.3 13-17 -14 1.5-3.1 -17.5 0.18Cascode

bank selection

[4] 2.4/5.2 10 14/15.5 -15 2.3/4.5 0/5.6 0.35Concurrent Dual-band

[6] DC-6.5 9.7 16.5 -10 > 2.7 -2 90nRes.SF.Feed-

back

[8] 2.4-5.4 4.6 22-24 -12 2.2-3.1 -21 0.13 Multitap Ind.

[9]0.9÷5.

27.5 13-16 -12 2.3-2.9 -14 0.18 Switched Ind.

[11] 5.2 10 11 <-10 2.17 0.3 0.18CS. Single

band


A reconfigurable multi-standard LNA operating from 1.9G to 5.2G bands for most popular standard like LTE/GSM, WiMAX, WLAN 802.11 family.

Channel tuning by selection of various combination of cascode bank and input matching

Good performances achieved in 0.18um CMOS Promising for single chip, next generation radio.

Conclusions

Thank You !

Phan Tuan Anh Dec. 2010 Reconfigurable Multiband Multimode LNA for LTE/GSM, WiMAX, and IEEE...

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