A fast pump-down V/sub BB/ generator for sub-1.5-V DRAMs

Abstract

Based on the study about the previously developed V/sub BB/ generators, a fast pump-down and high-efficiency V/sub BB/ generator with a cross-coupled hybrid pumping circuit 2 (CHPC2) is presented in this paper. CHPC2 takes only the advantages from the previous generators, eliminating the disadvantages. CHPC2 shows a |V/sub BB/|/V/sub CC/ as large as 98% even at low V/sub CC/=0.9 V, strongly ensuring that it is suitable at sub-1.5-V DRAM applications. Moreover, CHPC2 exhibits a better pumping efficiency and a larger pumping current over the previous ones with a wide range of the load resistance at V/sub CC/=1.2 V.