Abstract:
Densely packed integrated circuit arrays for high speed memory and logic applications are fabricated using silicon semiconductor field-effect transistors (FET) which are electrically isolated one from the other by fully recessed oxide isolation regions. The method of fabrication is featured by the reduction of detrimental source to drain conduction along the side-wall of the recessed oxide to a level less than that of the main channel of the FET. Ion implantation is used to provide additional doping concentrations in the silicon substrate adjacent to the sidewall region and underneath the recessed oxide. The excess dopant underneath the recessed oxide serves as a parasitic-channel stopper. Sidewall doping is facilitated by implanting into canted sidewalls in the silicon substrate prior to the formation of the recessed oxide therein. The canted side-walls are achieved by utilizing an anisotropic etch in combination with a oriented p-conductivity type substrate.
Abstract:
A bit oriented integrated circuit insulated gate field effect transistor memory array is disclosed which includes decoding on a semiconductor chip for both word and bit lines. Decoders which incorporate a combination of NOR logic elements and inverters provide for selection of a pair of bit lines and a single word line such that information can be written into a field effect transistor bistable circuit memory cell associated with these word and bit lines. Decoder controlled bit line switches in the form of field effect transistors are enabled to close the circuit between the bit driver and a column of memory cells. Also disclosed is a bit line biasing technique which eliminates the possibility of false writing into unselected memory cells. This is accomplished by applying a voltage via a resistance to the bit lines or by intermittently applying an appropriate voltage to the bit conductors associated with unselected memory cells.
Abstract:
PROBLEM TO BE SOLVED: To provide an advanced 3T1D memory cell having a readout selection switch and a readout switch. SOLUTION: The memory cell has (1) a writing switch 1325 for which a 1st terminal is coupled with a bit line and a control terminal is combined with a 1st control line, (2) a 2-terminal semiconductor device 1330 for which a 1st terminal of the 2-terminal semiconductor device is coupled with the 2nd terminal of the writing switch, a 2nd terminal is coupled with at least one of a 2nd control line, and the capacitance when the voltage of the 1st terminal against the 2nd terminal is exceeding the threshold voltage becomes larger than the capacitance not exceeding the threshold voltage, (3) a readout selection switch 1340 for which the control terminal is coupled with the 2nd control line, and the 1st terminal is coupled with the bit line, and (4) a readout switch 1345 for which the control terminal is coupled with a 1st terminal of the gate control diode and the 2nd terminal of the writing switch, the 1st terminal is coupled with the 2nd terminal of the readout selection gate, and further the 2nd terminal is grounded. COPYRIGHT: (C)2006,JPO&NCIPI