Abstract
This paper presents a circuit design technique, based on a CMOS charge-domain passive mixer, for WLAN applications in a 2.4 GHz band. The CMOS passive mixer is designed to mitigate the critical flicker noise problem that is frequently encountered in constitution of direct conversion receivers. The charge-domain method is employed to improve the high frequency performance and noise characteristic. The designed circuit is composed of a trans-conductance amplifier and a passive mixer with a capacitive charge storing load. Fabricated in 0.13 μm CMOS process, this charge-domain mixer achieves a low flicker noise with corner frequency of under 100 kHz, 8.1 dB noise figure, 10.6 dB conversion voltage gain, 2.5 dBm IIP3, and –5.7 dBm P1dB with 2.4 GHz LO driving at 5 dBm. It consumes 4.31 mA from 1.5 V supply.
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