A switchable multi-standard LNA for mobile communications

This paper presents the design of a multi-standard low noise amplifier (LNA) with the capability to switch between 1.9-GHz W-CDMA standard and 0.9-GHz GSM standard. Frequency band selection of the multi-standard LNA is implemented by using inductive, capacitive and resistive switching. The design is implemented by using Silterra 0.18-μm CMOS technology process with the supply voltage of 1.8V. The post-layout simulations of the multi-standard LNA at W-CDMA 1.9 GHz for the input matching S₁₁ is -9.74 dB, reverse isolation S₁₂ is -53.01 dB, power gain S₂₁ is 12.18 dB, and output matching S₂₂ is -12.41 dB. On the other hand, the post-layout simulations at GSM 0.9 GHz for the input matching S₁₁ is -10.45 dB, reverse isolation S₁₂ is -63.13 dB, power gain S₂₁ is 10.24 dB, and output matching S₂₂ is -13.64 dB. The noise figure of the multi-standard LNA at W-CDMA 1.9 GHz is 2.62 dB and GSM 0.9 GHz is 3.56 dB. The total power consumption is 33.1 mW when the multi-standard LNA is operating at 1.9-GHz W-CDMA standard 0.9-GHz GSM standard. The voltage supplied to the CMOS switches is 3 V. The die size is 1.65 mm × 1.80 mm.