An Active Marchand Balun and Its Application to a 24-GHz CMOS Mixer
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An Active Marchand Balun and Its Application to a 24-GHz CMOS Mixer
Abstract— A fully integrated 24-GHz Gilbert-cell mixer incorporating two on-chip Marchand baluns to convert single-ended signals into differential signals is presented. One is a passive balun at local oscillator (LO) port to improve isolation between the LO and radio-frequency (RF) ports, and the other is an active balun at RF port to enhance the conversion gain (CG) of the down-conversion mixer. The active balun utilizes complementary cross-coupled pairs (CCPs) to compensate for its resistive losses. Moreover, the gate-to-source capacitances (C gs )of
the CCPs are also absorbed into coupled lines and then reduce the chip size. The chip area of the active balun is about one quarter of the passive one. < final year projects >
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