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A 2.4 GHz Passive IQ Mixer Using Phase Adjustable Polyphase Filter

In this paper, a 2.4 GHz IQ mixer using phase correct technique is presented. The phase adjustable polyphase filter (PAPPF) is proposed to improve I/Q phase correction, which is realized by a configurable LC tank. The capacitor array is configured by the off-chip logical signal. The tuning range of the phase is up to 4.5°. This work is demonstrated using a 110 nm CMOS process technology with the chip area of 0.36 mm2 (active area). A conversion gain of 23.7 dB and a noise figure of 9 dB (NF) of the mixer are achieved. And the power consumption of the whole mixer is 3.6 mW.