Nmos Sense Amplifier With Automatic High Voltage Level Rewrite
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
This sense amplifier (S/A) circuit, made in N channel field-effect transistor technology, eliminates bit line droop and the need for a dummy cell without having to resort to complementary metal oxide semiconductor (CMOS) technology. The S/A circuit automatically rewrites a cell to full high voltage (VH) level after a read cycle to ensure full signal storage, as well as to assure refresh and consecutive read stability. The result is a reduction in memory cycle time, reduced power dissipation, and only two columns of sense amplifiers need be activated in an interdigitated bit line dynamic random-access memory (DRAM) layout. As shown in the circuit diagram and associated timing diagram: 1) During initial sensing, the word line WL turns on first (not shown in the circuit diagram), transistors 3 and 4 are off.