摘要:
Es wird eine verbesserte dynamisch betriebene Speicherzelle aus zwei komplementären bipolaren Transistoren (30, 31) zum Aufbau eines hochintegrierten Halbleiterspeichers beschrieben, dessen Speicherzellen (18) im Kreuzungspunkt von Wort- und Bitleitungen liegen. Jede der Speicherzellen ist von jeder anderen innerhalb des Speichers durch miteinander verbundene Gräben (34) isoliert. Die Wände der Gräben (34) sind mit einer Oxidschicht (25) überzogen und mit Silicium-material (14) aufgefüllt, das mit dem darunterliegenden Substrat (11) verschmolzen ist.
摘要:
An electrostatic discharge protection device and method decreases the latch-up susceptibility of an ESD structure by suppressing the injection of minority carriers that cause transistor action to occur. This is accomplished, for example, by using a metal contact to the n-substrate or n-well in place of or in parallel with the prior art p-diffusion. Using such metal contact forms a Schottky Barrier Diode (SBD) with the ESD structure. Since the SBD is a majority-carrier device, negligible minority carriers are injected when the SBD is in forward bias, thereby reducing the likelihood of latch-up.
摘要:
A programmable storage element for redundancy-programming includes a programmable antifuse circuit which includes a plurality of first resistors (F1a, F1b, F1c) and a switching circuit (Q Fa , Q Fb , Q Fc , Q Fd ) for coupling the first resistors in series in response to a plurality of first control signals (Ta, Tb, Tc, Td) and for coupling the first resistors in parallel in response to a plurality of second control signals to permit programming of the first resistors, and a sensing circuit for determining whether or not the first resistors have been programmed. The state of the first resistors is determined by comparing a first voltage drop across the first resistors with a second voltage drop across a second resistor. Each of the first resistors is an unsilicided polysilicon conductor which has an irreversible resistance decrease when a predetermined threshold current is applied for a minimum period of time.
摘要:
A method is provided for making a semiconductor structure which includes the steps of forming in a semiconductor body a P/N junction and a first opening (50, 54) in a first insulating layer (42) disposed on the surface of the semiconductor body. A trench (22) is then formed in the semiconductor body having a sidewall located along a given plane through the opening and through the P/N junction. A second layer of insulation (56) is formed within the opening and on the sidewall of the trench. An insulating material (24) is disposed within the trench (22) and over the second insulating layer (56) in the opening and a block (62) or segment of material is located over the trench (22) so as to extend a given distance from the trench over the upper surface of the body. The insulating material (24) and the block (62) are then etched so as to remove the block and the insulating material along the sides of the block. The exposed portions of the second insulating layer (56) are now etched to form a second opening therein within the first opening (50, 54) in the first insulating layer (42). A layer (64) of low viscosity material, such as a photoresist, is formed over the semiconductor body so as to cover the remaining portion of the insulating material (24), the layer (64) of low viscosity material and the insulating material (24) having similar etch rates. The layer (64) of low viscosity material and the insulating material (24) are then simultaneously etched directionally, e.g., by a reactive ion etching process (RIE), until all of the layer (64) of low viscosity material is removed to at least the surface of the second insulating layer (56) at the trench (22). Any suitable wet etchant may then be used, if desired, to remove any remaining low viscosity material disposed within the second opening in the second insulating layer. Metallic contacts (W T , W B , B O ) may now be formed, e.g., by evaporation, on the surface of the semiconductor body within the second opening in the second insulating layer without the concern that the metallic material will seep or enter into the trench causing a short at the P/N junction. In a preferred embodiment of the invention, the insulating material (24) is polyimide and the block (62) of material, as well as the layer (64) of low viscosity material, is made of photoresist.
摘要:
Es wird eine dynamische bipolare Speicherzelle angegeben, die aus zwei komplementären, jeweils zwischen Basis und Kollektor verbundenen Transistoren besteht und, wobei der PNP-Transistor als Lesetransistor und der NPN-Transistor als Schreibtransistor dient und wobei die Speicherung zwischen der Basis des Lesetransistors und dem Kollektor der Schreibtransistors liegt. Der Speicherpunkt ist mit einer ersten Kapazität verbunden, die über der Emitter-Basisstrecke des Lesetransistors liegt, mit einem zweiten Kondensator, der über der Basis-Kollektorstrecke des NPN-Transistors und mit einem dritten Kondensator, der zwischen einem festen Potential und einem gemeinsamen Punkt zwischen Kollektor des Lesetransistors und Basis des Schreibtransistors liegt.