Conventional voltage-gain enhancement of a traditional cascode amplifier using a gate-driven amplifier is not suitably applicable in (very-) low supply voltages. Here, we propose a novel gain-enhancement technique called “body-driven gain-boosting” technique where a body-driven auxiliary amplifier enhances the output impedances of both the amplifier and the current-source load. Thus, the gain/swing requirement of the operational amplifier (opamp) is satisfied using a single-stage structure with much less power consumption compared to two- or multi-stage configurations. Simulation results of two different sub-1-V single-stage opamps for different speed-accuracy specifications are presented to demonstrate the effectiveness of the proposed structure.