2.45 GHz ZigBee receiver frontend for HAN with smart meter

This paper proposes a 2.45 GHz ZigBee receiver frontend for the communication in a HAN (Home Area Network) with the smart meter. By employing a cascode LNA, the gain is simulated to be 17.376 dB at 2.45 GHz. Besides, by using the double-balanced Gilbert mixer with a current bleeding MOS transistor, the NF and the IIP3 of the mixer are only 5.074 dB and −7.234 dB, respectively. In order to reduce the phase noise of the receiver, a fractional-N frequency synthesizer with a complementary cross-coupled VCO and a multi-modulus divider are utilized. Moreover, a delta-sigma modulator is included for the noise shaping. The phase noise of the fractional-N frequency synthesizer is 137.7 dBc/Hz. The proposed circuit is carried out using the standard 0.18 μm CMOS process. The core area is 3.57 mm 2 .