A new circuit configuration for a static memory cell with an area of 880 /spl mu/m/sup 2/
A new 5-transistor memory cell in double polysilicon technology with depletion-load elements and a minimum linewidth of 3 /spl mu/m is presented. The circuit configuration, based on a Schmitt trigger, leads to static memory cells having a bit density of 1100 bit/mm/SUP 2/ and an average power consumption of 5.5 /spl mu/W/cell. With the help of computer simulations the static and dynamic behavior of the basic circuit are calculated and discussed in detail as well as the two possible operation modes of the memory cell. These results compare favorably with the experimental results obtained on a realized 2/spl times/4 memory array. The performance of the proposed memory cell is the same as that of a conventional 6-transistor cell, but the area is reduced.
Bipolar structures for BIMOS technologies
Recent advances in LSI and VLSI have offered many possibilities in mixing MOSFET and bipolar integrated structures on the same chip. The authors study the integration of bi-polar structures in BIMOS environments. More specifically bipolar structures are studied under the constraints and guidelines of a given MOS technology, e.g., the nonexistence of an n/SUP +/ underlayer, and the high epitaxial (substrate) resistivity. A bipolar structure, based on merging a multicollector p-n-p transistor with a multiemitter n-p-n transistor is proposed. The structure takes advantage of the availability of clock signals on a MOS chip, and uses the epitaxial (substrate) resistance as a load. It can be used to realize logic and memory functions. Computer simulation as well as experimental results show that the structure can perform efficiently in both BIMOS and bipolar technologies.
Suppressed Light Emission of the Reaction Zone in Detonation
THE detonation of high explosives in water can be photographed with an open camera and a flash light as the explosive gases do not emit light. The method has been used1 to investigate the spread of shock waves and explosive gases, and to investigate the initiation by shock waves2. We have found that it can be used also in certain gases such as butane and propane. The method is not suitable, on the other hand, for explosives with two levels of detonation velocity in the case of low velocity. A great part of the reaction then occurs after the reaction zone has passed and the expanding explosive gases are very luminous even in water.