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

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 1  Introduction Introduction  Design Approach Design Approach  Conclusions ConclusionsContent  Proposed Circuitry Proposed Circuitry  Simulation Results Simulation Results

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 2 Radio standards: - Rapid evolution next generation radio with WiMAX (3.5G), LTE (4G) along with existing GSM (2G), WLAN IEEE 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 Introduction Introduction

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 3 Fig. 1 Source: Bob Iannucci, Nokia 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

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 4  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 b/g/n at 2.4GHz, WiMAX at 3.5GHz, 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

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 5  Reconfigurable LNA Design Approach Fig. 2. Reconfigurable Principle of the LNA - Selection solely or jointly a bank of cascode LNAs

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 6 + Switching CG Devices for various band configuration of cascode LNA Proposed Multiband LNA Fig. 3. Schematic of the proposed multiband LNA

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 7 + Input matching - Inductive degenerative input matching - As M 0 varies, L G (~10nH) is varied for better matching. - Bit D1-4 controls the selection of corresponding band. + Load and Buffer - Inductive load L L (4-8nH) and source follower buffer are shared - Reduce the chip size - Different bands are optimized with its own output Cap bank C Gain control - Selection of Gm’s device size M 0 - Optimize for power consumption Proposed Multiband LNA: Features

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 8  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 used for good NF -L G is needed for better matching as M 0 size varying for various bands - Good S11 and S22 achieved

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 9 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

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 10  Gain Tuning Simulation Results: Gain variable Fig. 6. Variable gain function over different bands - Varying Gm by selecting bank of M 0 devices for sizing and bias current. - From low to maximum gain mode, 10dB range.

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 11  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 is 3/3.4/3.4/5.3mW at 1.9/2.4/3.5/5.2GHz bands, respectively V 0.18um CMOS

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 12  Performance summary and comparison Performance Summary Freq. (GHz) Power (mW) S21 (dB) S11 (dB) NF (dB)IIP3 Tech. μm Topology This work Cascode bank selection [4]2.4/ / /4.50/ Concurrent Dual-band [6]DC > n Res.SF.Feed- back [8] Multitap Ind. [9] 0.9÷ Switched Ind. [11] < CS. Single band

Phan T. Anh, Phan T. Anh, Dec IMWS, NUIM 13 A reconfigurable multi-standard LNA operating from 1.9G to 5.2G bands for most popular standard like LTE/GSM, WiMAX, WLAN 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 !