A 5.25 GHz Even Harmonic Mixer for Low Voltage Direct Conversion Receivers

This paper proposes a 5.25 GHz folded-cascode even harmonic mixer (FEHM) for low voltage applications. This FEHM adopts the folded technique to reduce the headroom voltage, employs current reuse circuit to improve linearity, and uses double frequency technique to overcome the DC offset problem for direct conversion receivers. At an IF frequency of 500 kHz, the measurement reveals that the proposed FEHM possesses conversion gain of 8.89 dB, IIP₃ of -11.555 dBm, and IIP₂ of 17.32 dBm under supply voltage of 0.9 V with power consumption about 6.57 mW