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A compact power-efficient class-AB Miller op-amp is introduced. It uses a simple auxiliary circuit that enhances the op-amp&#x2019;s gain-bandwidth product and helps to drive a wide range of capacitive and resistive loads with high static and dynamic current efficiency. Simple Miller compensation is used to obtain stability over a wide range of loading conditions. The op-amp&#x2019;s simulation and experimental results in strong inversion with <inline-formula> <tex-math notation="LaTeX">$15\mu \text{A}$ </tex-math></inline-formula> bias current and in sub-threshold with 250nA bias current are shown. Its performance is measured in terms of dynamic and static current efficiency figures of merit FOMCEDyn and FOMCEStat. and using the conventional small-signal figure of merit FOMSS. Experimental results of op-amps fabricated in a 130nm CMOS technology are shown that validate the proposed approach.

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An Enhanced Gain-Bandwidth Class-AB Miller op-amp With 23,800 MHz&#x00B7;pF/mW FOM, 11-16 Current Efficiency and Wide Range of Resistive and Capacitive Loads Driving Capability