Abstract
On-chip voltage generation [5.1–5.8] is becoming increasingly important for memory LSI design, as well as for other LSI designs. This importance is being accelerated by a recent trend toward lower-voltage operation. In the past, generators have been widely used in commercial memory chips such as DRAMs and Flash memories, as explained in Chap. 1. For example, DRAM chips have needed various kinds of power-supply voltages, which have been generated internally by using a single external supply-voltage (V DD), as shown in Fig. 5.1. A negative voltage (V BB) is a substrate bias voltage supplied to an NMOS memory-cell array to ensure stable memory-cell operation. A boosted dc voltage (V DH or V PP) is for word bootstrap**, to eliminate the drop in the cell V T. A half-V DD (or V DL) achieves a half-V DD (or V DL) data-line précharge for power reduction, and a half-V DD (or V DL) cell-capacitor plate for high S/N ratio design, as explained in Chaps. 3 and 4. Modern commercial DRAMs of 16 Mb and beyond even incorporate an on-chip voltage down-converter, which lowers V DD to V DL, by using an internal reference voltage (V REF), to simultaneously achieve high reliability of small devices and power-supply standardization. Flash memories have also used an extremely boosted word-line voltage, and even a negative voltage, to relaxing a stress voltage to a memory-cell FET, as explained in Chap. 1. Schematic circuits for generating these internal voltages are shown in Fig. 5.2.
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Itoh, K. (2001). On-Chip Voltage Generators. In: VLSI Memory Chip Design. Springer Series in Advanced Microelectronics, vol 5. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04478-0_5
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DOI: https://doi.org/10.1007/978-3-662-04478-0_5
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