phan tuan anh dec. 2010 reconfigurable multiband multimode lna for lte/gsm, wimax, and ieee...
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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
33Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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
44Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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
55Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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
66Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
Reconfigurable LNA
Design Approach
Fig. 2. Reconfigurable Principle of the LNA
- Selection solely or jointly a bank of cascode LNAs
77Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
+ Switching CG Devices for various band configuration of cascode LNA
Proposed Multiband LNA
Fig. 3. Schematic of the proposed multiband LNA
88Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
+ 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
99Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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
1010Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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
1111Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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.
1212Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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
1313Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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
1414Phan T. Anh,Phan T. Anh, Dec. 2010 IMWS, NUIM
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 !
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