Mobility

A Weak-Inversion Low-Power Active Mixer for 2.4 GHz ISM Band Applications

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Executive Summary

Down-Conversion mixers are a key building block in any modern wireless receiver. Typically, active mixers are favored over their passive counterparts for their superior conversion gain and port to port isolation. Unfortunately, active mixers generally consume a significant portion of the receiver's overall power. Furthermore, active mixers introduce flicker noise into the receiver that can degrade the systems dynamic range. In general, if a transistor's device length is kept constant, its input-referred flicker noise is inversely related to power consumption. This makes it difficult to realize a low-power active mixer with a sufficiently low flicker noise corner frequency.

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