Bandwidth-Enhanced High Current Efficiency Class-AB Buffer With Very Low Output Resistance

A class-AB buffer with factor five output current enhancement and 11 times higher bandwidth than a conventional buffer with comparable power dissipation is proposed. The output impedance is lower than <inline-formula> <tex-math notation="LaTeX">$ {1~\Omega }$ </tex-math></inline-formula>. Experimental results of a test chip prototype fabricated in 0.18-<inline-formula> <tex-math notation="LaTeX">${\mu }\text{m}$ </tex-math></inline-formula> CMOS technology validate the proposed circuit.