Adaptive analog biasing: a robustness-enhanced low-power technique for analog baseband design

This paper presents a novel and highly efficient low-power technique called Adaptive Analog Biasing (AAB). Implemented in hardware and based on sensed process information and temperature, AAB automatically adjusts bias current of MOS transistors operating in saturation region for the desired transconductance over parts and temperature, reduces power consumption to minimum, and at the same time, enhances the robustness against process and temperature variations. The concept, and a very simple implementation of AAB are presented. With AAB biasing current, up to 60% power reduction and 24 times sensitivity reduction has been achieved w.r.t. conventional bias currents.