Design Guidelines for β-Multiplier Current Reference Circuits

Current references constitute fundamental building blocks in many analog and mixed-signal circuits. Their main purpose is to provide a precise and accurate current, which in turn establishes the operating point for other components. In this work, we delve into the essential concepts behind designing CMOS current references, specifically focusing on the conventional $\boldsymbol{\beta}$-multiplier reference topology. Key aspects, including $V_{D D}$ sensitivity, temperature coefficient, and start-up considerations, are thoroughly discussed.