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We propose two 2-bit adders, Type-A and Type-B, as the basic cells for three novel low-voltage (1.1 V) micropower 16-bit asynchronous adders: Adder-A, Adder-B and Adder-AB. Adder-A employs Type-A adders and features high speed and low power dissipation. Adder-B employs Type-B adders and has lower speed and features lower power dissipation. By combining Type-A and Type-B, the hybrid Adder-AB design features the same power dissipation as Adder-B but with significantly higher speed. We analytically derive the speed and power dissipation of our designs. We compare our designs with reported synchronous and asynchronous designs and show that our designs have some improved parameters over these reported designs.