Abstract
This paper presents a fully integrated broadband high linearity and isolation down-conversion mixer. The proposed mixer utilizes a current-feedback resistive source-degenerated input stage to achieve high linearity and exhibits high isolation by the balanced layout plan. The mixer fabricated by tsmc 0.18 μm Mixed Signal CMOS process achieves maximum input third-order intercept point (IIP3) of 7.4 dBm, input 1-dB compression point (P–1 dB) of –15 dBm, power conversion gain of 3.7 dB, and single side-band noise figure of 19.2 dB over the entire 2.3–5.8 GHz WiMAX frequency band. The LO-RF and LO-IF isolations are 44.2 dB and 62.2 dB, respectively. The measured power consumption is 8.3 mW at a 1.8 V power supply.
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