Dynamic random access memory having reduced array voltage
US6141259A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1999 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Feb 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10B12/50
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A random access memory (RAM) having a bipolar reduction in array operating voltage is disclosed. In a preferred embodiment, a clamping transfer gate circuit (414) couple pairs of bit lines (BL and /BL) to pairs of sense nodes (410 and 412). The clamping transfer gate circuit (414) includes an n-channel MOS transistor (N401 and N402) in series with a p-channel MOS transistor (P401 and P402) coupling a bit line (BL or /BL) to a sense node (410 or 412). The gates of the n-channel transistors (N401 and N402) are driven by the high power supply voltage (VDD), and the gates of the p-channel transistors (P401 and P402) are driven by the low power supply voltage (VSS). A sense amplifier circuit (418) drives the sense node pair (410 and 412) to opposite power supply voltages (VDD and VSS). The n-channel transistors (N401 and N402) in the clamping transfer gate circuit (414) clamp the voltage on the bit lines (BL and /BL) to a maximum level of VDD-Vtn, where Vtn is the n-channel transistor threshold voltage. The p-channel transistors (P401 and P402) in the clamping transfer gate circuit (414) clamp the voltage on the bit lines (BL and /BL) to a minimum level of VSS+Vtp, where Vtp is the p-ch…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.