On nonlinearity and noise trade-off in a low power 2.45 GHz CMOS LNA-mixer design

A detailed nonlinearity and noise analysis for a low noise amplifier and mixer design for 2.45 GHz Bluetooth applications is presented. As a result, the trade-off between noise, linearity, power consumption and impedance matching was considered as a design guide. A 2.45 GHz LNA-mixer has been designed and simulated in a 0.35 mum 4M2P CMOS technology to demonstrate the trade-off. Some performance results obtained through simulations are: N F=7.9 dB, voltage gain=27 dB, P II P3 = -14.4 dBm, IF = 1 MHz and power consumption of 15.6 mW at 3.3 V power supply.