A 2.4 GHz double balanced downconversion mixer with improved conversion gain in 180-nm technology

摘要

In this paper a 2.4-GHz non-return to zero (abbreviated as NRZ) active downconversion mixer for transceiver system is demonstrated. It features with the double- balanced topology, NRZ mechanism, an effecting biasing technique and a current mirror technique are used to achieve the requirements. Downconversion mixer is realized on 180 nm CMOS technology. Despite of trade-off between conversion gain and linearity we can achieve very high conversion gain with moderate linearity. Simulations using cadence tool exhibits a conversion gain of 24.61 dB, a third order intercept point of 6.17 dB, a 1-dB compression point of - 5.86 dB and a second order intercept point of + 87.66 dB at 1.8 V supply.