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Reconfigurable Multiband Multimode LNA for LTE, GSM, WiMAX, and IEEE 802.11 Standards

This paper presents a novel reconfigurable, multiband, multimode low-noise amplifier (LNA) designed to support multiple wireless standards, including LTE, GSM, WiMAX, and IEEE 802.11. The proposed LNA employs CMOS technology and features tunable input matching to effectively handle various frequency bands from 1.9 GHz to 5.2 GHz. Simulation results demonstrate excellent gain, noise figure, and input/output matching across different standards, showcasing the viability of this approach for integrated single-chip radio devices.

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Reconfigurable Multiband Multimode LNA for LTE, GSM, WiMAX, and IEEE 802.11 Standards

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  1. Reconfigurable Multiband Multimode LNA for LTE/GSM, WiMAX, and IEEE 802.11.a/b/g/n 17th IEEE ICECS 2010, Athens, Greece. Phan Tuan Anh Dec. 2010

  2. Content • Introduction • Design Approach • Proposed Circuitry • Simulation Results • Conclusions

  3. Introduction • 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

  4. Next generation: Reconfigurable Radio Fig. 1Source: 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

  5. Design Challenges • 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

  6. Design Approach • Reconfigurable LNA • Selection solely or jointly a bank of cascode LNAs Fig. 2. Reconfigurable Principle of the LNA

  7. Proposed Multiband LNA + Switching CG Devices for various band configuration of cascode LNA Fig. 3. Schematic of the proposed multiband LNA

  8. Proposed Multiband LNA: Features + 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

  9. Simulation Results: S11 and S22 • Input matching and Output matching • Inductive degeneration Ls is used • for good NF • LG is needed for better matching as M0 size varying for various bands • Good S11 and S22 achieved Fig. 4. S11 and S22 for different standards of proposed LNA

  10. Simulation Results: S21 and NF • Good gain over different bands • - NF is quite good at low frequency and reasonable at high band Fig. 5. Typical Gain mode and NF of different standards

  11. Simulation Results: Gain variable • Gain Tuning • Varying Gm by selecting bank of M0 devices for sizing and bias current. • From low to maximum gain mode, 10dB range. Fig. 6. Variable gain function over different bands

  12. Simulation Results: Linearity • Linearity at various bands • High gain mode shows moderate IIP3 • Power consumption is • 3/3.4/3.4/5.3mW at 1.9/2.4/3.5/5.2GHz bands, respectively. • 1.5V supply @ 0.18um CMOS Fig. 7. Linearity at different bands in Low and High gain modes

  13. Performance Summary • Performance summary and comparison

  14. Conclusions • 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. Thank You !

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