A fast pump-down VBB generator for sub-1.5-V DRAMs

摘要

Based on the study about the previously developed VBBngenerators, a fast pump-down and high-efficiency VBBngenerator with a cross-coupled hybrid pumping circuit 2 (CHPC2) isnpresented in this paper. CHPC2 takes only the advantages from thenprevious generators, eliminating the disadvantages. CHPC2 shows an|VBB|/VCC as large as 98% even at low VCCn=0.9 V, strongly ensuring that it is suitable at sub-1.5-V DRAMnapplications. Moreover, CHPC2 exhibits a better pumping efficiency and anlarger pumping current over the previous ones with a wide range of thenload resistance at VCC=1.2 V