Inverter-Based Fully-Differential Amplifier with 150 mV minimum Supply Voltage

This paper presents the experimental assessment of a recently proposed ultra-low voltage fully-differential inverter-based amplifier. Thanks to the novel common-mode stabilization loop, the amplifier reaches effective differential operations without compromising the output differential performance even at supply voltages as low as 150 mV. Experimental measurements demonstrate the amplifier functionality at supply voltages between 0.15 V and 0.5 V. In particular, a differential dc voltage gain of 22 dB, a gain-bandwidth product of 750 Hz with a capacitive load of 100 pF, and a static current consumption of only 57 nA are measured at V<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dd</inf> = 0.3 V, with an area consumption of only 800 μm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>.