Title :
A novel on-chip voltage generator for low voltage DRAMs and PRAMs
Author :
Matano, Tatsuya ; Sato, Koji ; Nakai, Kiyoshi ; Asano, Isamu
Author_Institution :
Elpida Memory, Inc., Sagamihara, Japan
Abstract :
A novel on-chip voltage generator suitable for low voltage operation has been developed and demonstrated through a 128 Mb PRAM test chip using 72 nm CMOS process. It features three key circuit techniques as follows: 1) a cross charge pump circuit with a shift charge method , which generates VPP supply current larger over 35% than conventional pump circuits, 2) an incidental pumping scheme, which suppresses VPP fluctuation by 50 mV and reduces pump circuits area by about 25% for the conventional scheme by dispersing the pump operation, 3) a dual regulator scheme, which reduces the consumption current of the regulator in active mode to less than 1/3 in comparison with the conventional scheme while maintaining enough supply current.
Keywords :
CMOS memory circuits; SRAM chips; charge pump circuits; low-power electronics; phase change memories; CMOS process; PRAM test chip; charge pump circuit; dual regulator scheme; incidental pumping scheme; low-voltage DRAM chip; memory size 128 MByte; on-chip voltage generator; phase change RAM; shift charge method; size 72 nm; voltage 50 mV; CMOS process; Charge pumps; Circuit testing; Current supplies; Fluctuations; Low voltage; Phase change random access memory; Regulators;
Conference_Titel :
Custom Integrated Circuits Conference, 2009. CICC '09. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-4071-9
Electronic_ISBN :
978-1-4244-4073-3
DOI :
10.1109/CICC.2009.5280828
