A High-Efficiency Back-Bias Generator with Cross-Coupled Hybrid Pumping Circuit for sub-1.5 V DRAM applications

摘要

Based on the study about the previously developed back-bias generators, a new high-efficiency back-bias generator with the Cross-coupled Hybrid Pumping Circuit 2 (CHPC2) is presented in this paper. CHPC2 takes only the advantages from the previous ones, throwing away the disadvantages. CHPC2 shows ∣V_(BB)∣/V_(CC) as large as 98% even at low V_(CC)=0.9 V, strongly addressing that it will be suitable at low voltage DRAM applications. Moreover, CHPC2 exhibits much better pumping efficiency and larger pumping current over the previous ones with wide R_L range at V_(CC)=1.2 V.