Cascode mixer for multiband wireless

This paper describes multiband cascode mixer for 2.4 GHz and 5.8GHz wireless LAN applications. The designed mixer has been found to give isolation for LO-to-IF as ≅ -20dB, LO-to-RF as ≅-18dB and RF-to-IF as ≅-13 dB at 2.4GHz, whereas these isolations, at 5.8GHz, were found as ≅-16dB, ≅-14dB and ≅-11.5dB, respectively, with fixed intermediate frequency f_IF of 100MHz. With power consumption P_dc≅ 4.2mW, the mixer demonstrated conversion gain G_c>10dB and linearity IP3 >1.2dBm at the both the bands. For performance verifications, a new Figure-of-Merit for mixer (FoMmixer) involving G_c, noise figure NF, IP3 and dc power consumption Pd_c has been proposed. Using FoMmixer, it has been found that underlap mixer shows higher FoM_Mixer compared to non-underlap bulk experimental results.