An Rf-cmos Lna and Mixer Merged Design Strategy

Low Noise Amplifier and Mixer design considerations for 2.45 GHz Bluetooth applications have been studied. A detailed noise analysis is presented. A design strategy for an inductively degenerated common-source LNA with cascode transistor and current-commutating Mixer is proposed, considering the tradeoffs between noise, linearity, power consumption and matching of impedances. Additionally, this work presents a new expression to estimate the LNA noise figure considering the noise introduced by the transconductance stage and the cascode device. A 2.45 GHz LNA-Mixer has been designed and simulated in a 0.35μm 4M2P CMOS technology to validate the proposed strategy. Some performance results obtained through simulations are: NF=7.9dB, Voltage Gain=27dB, PIIP3=−14.4dBm, IF = 1MHz and power consumption of 15.6mW at 3.3V power supply.