Design of an Ultra-low Power Receiver for 2.4GHz Applications in 90nm CMOS

An ultra low power receiver operating in 2.4GHz ISM band is designed using 90nm CMOS PTM with a IV supply voltage. This direct conversion receiver has an integrated noise figure of 4.15 dB in the 1kHz to 10MHz band. The input referred IP₃ for offset of 100MHz is -22.4dBm. The LO leakage to the RF port is less than -148dB. A base-band gain stage and buffer are used to provide a reasonable output impedance and power gain. With this, input and output are matched to 50 Omega and 500 Omega with both S₁₁ and S₂₂ being better than -25dB. The LNA, mixers and the base-band stages with the biasing network consume less than 1.1 mW.