摘要:
An intermediate structure for use in the manufacture of semiconductor devices such as field effect transistors, comprises a monocrystalline semiconductor body having a first outer layer (2), a central layer (3) and a second outer layer (4) each of said first and second outer layers being of semiconductor material different from the semiconductor material of the central layer and forming a heterojunction (5, 6) whith the central layer. The thickness of the central layer (3) is of the order of the transport length of a charge carrier in the semiconductor material of that layer. Preferably, at least two adjacent layers of the intermediate structure have substantially equal electron energy work functions. A vertical field effect transistor is formed (FIGS. 12 to 15) in a portion of an intermediate structure by removing areas (30, 31) of the second outer and central layers (4, 3) on each side of the portion, removing an area (32) of the second outer layer (4) at one end of the portion, etching the central layer (3) to form a web (22) connecting the first and second outer layers (2, 4), forming insulation (25, 27) on the exposed surfaces of the first and second outer layers (2, 4), forming a Schottky barrier electrode (23, 24) on the web and providing electrical contacts (35) to the first and second outer layers.
摘要:
A high performance decoder/driver circuit for a semiconductor memory having A1 to AN (true) and A1 to AN (complement) address lines for receiving A1 to AN address bit signals thereon from internal address buffers. A φPC line is included for receiving a φPC precharge clock signal thereon and a φR line is provided for receiving a φR reset clock signal thereon. The decoder/driver circuit includes an OR decoder means having a plurality of transistor switching devices (1-7) connected to A1 to AN-1 or A1 to AN-1 of the true and complement address lines for the AN to AN-1 address bits for producing a high or low level signal on an OR decoder output node (16) depending on the address bits state. The decoder/driver circuit further includes a selection means (8-11) having a plurality of transistor devices including p-channel devices, having diffusion contacts connected to the output node (17, 18) of the decoder and to AN and AN lines to produce a first selection signal when the OR decoder output node is low and the AN line is high and a second selection signal when the OR decoder output node is low and the AN line is high. A driver circuit is connected to the selection means and is responsive to the first selection signal to provide an output signal on a first memory word line (WLi) and is further responsive to the second selection signal to provide an output signal on a second memory word line (WLi+1).
摘要:
A complementary input circuit is used to transfer the state of an external input (ADR IN) to the internal signal lines (ADR, ADR) of an integrated circuit chip. A nonlinear input circuit has an input terminal (ADR IN) for receiving the external input and provides an output to a first node (a) only when the external input exceeds a reference voltage (V R ) and a threshold voltage. It comprises further latch means having first and second output nodes (b. c) connected to the internal signal lines (ADR, ADR ) of the integrated circuit chip and having an input node common to said first node (a) for receiving the output of the nonlinear input circuit, said latch means comprising transistor devices (3, 4, 5. 6) which are partially cross-coupled.
摘要:
A semiconductor random access memory chip wherein the cycle time is less than the access time for any combination of read or write sequence. The semiconductor random access memory chip is partitioned into relatively small sub-arrays with local decoding (RS, WS) and precharging (BLPC). The memory chip operates in a pipelined manner with more than one access propagating through the chip at any given time and wherein the cycle time is limited by sub-array cycles wherein the cycle time is less than the access time for a memory chip having cycle times greater than access times for accesses through the same sub-array. The memory chip also incorporates dynamic storage techniques for achieving very fast access and precharge times.
摘要:
All the gates and source/drain contacts in a CMOS device (1) are formed from polysilicon or polycide. Using two levels of polysilicon or polycide, the first level is used to simultaneously form the gate (10) of one (2) of the CMOS transistors and buried contacts (30, 31) to the source/drain regions (13,14) of the other (3) CMOS transistor. The second level of polysilicon or polycide is then used to simultaneously form the gate (15) of the other (3) CMOS transistor and the buried contacts (28, 29) to the source/drain regions (8,9) of the first mentioned CMOS transistor. Because all the gates and contacts are polysilicon or polycide, it is possible to make interconnections between the gate on one of the devices and the source or drain of the other of the devices and between the gate on the other of the devices and the source/drain on said one of the devices simply by patterning the polysilicon or polycide layers.
摘要:
All the gates and source/drain contacts in a CMOS device (1) are formed from polysilicon or polycide. Using two levels of polysilicon or polycide, the first level is used to simultaneously form the gate (10) of one (2) of the CMOS transistors and buried contacts (30, 31) to the source/drain regions (13,14) of the other (3) CMOS transistor. The second level of polysilicon or polycide is then used to simultaneously form the gate (15) of the other (3) CMOS transistor and the buried contacts (28, 29) to the source/drain regions (8,9) of the first mentioned CMOS transistor. Because all the gates and contacts are polysilicon or polycide, it is possible to make interconnections between the gate on one of the devices and the source or drain of the other of the devices and between the gate on the other of the devices and the source/drain on said one of the devices simply by patterning the polysilicon or polycide layers.
摘要:
In a double level polysilicon semiconductor structure, eg for a static RAM cell, a silicided outer region (42) of one portion (40) of the second level polysilicon layer serves as a conductive bus while an adjacent portion (34) serves as a resistor. The silicided outer region (42) is formed by depositing a silicide-forming metal on the one portion (40) of the second level polysilicon layer and annealing the structure. The second level polysilicon layer is undoped or only lightly doped.