摘要:
A DC analog circuit which monitors a DRAM sample cell access device and outputs a DC reference voltage to the word line voltage regulation system. The resulting output voltage Vpp from the word line voltage regulation system will then vary in accordance with the cell access device parametrics so as to guarantee a full high level will always be written into the DRAM cell.
摘要:
A shallow trench capacitor is disclosed that is fabricated by forming a shallow trench in a substrate extending below a surface of the substrate. A dielectric layer having a preselected thickness is grown in the shallow trench, and a polysilicon layer is deposited over the dielectric layer. The polysilicon layer is then planarized down to the nitride or pad layer forming a capacitor. By utilizing a non-critical mask to open up selected regions, isolation structures may then be formed through shallow trench technology.
摘要:
The present invention relates generally to protection of integrated circuits from electrostatic discharges and more specifically to the use of devices formed in isolated well regions for electrostatic discharge protection. One aspect of the present invention is an ESD protection circuit that includes a first FET and a second FET. The drain of the first FET is coupled to an ESD susceptible node and the source of the first FET is coupled to a first voltage terminal. The gate and a well of the first FET are coupled together and to the drain of the second FET. The source of the second FET is coupled to the first voltage terminal. The gate of the second FET is coupled to a second voltage terminal. The second voltage terminal is connected to a voltage source that is at the first voltage when the circuit is not powered, and at a voltage above the threshold voltage of the second FET when the circuit is powered. The well in which the first FET is formed is electrically isolated from other wells in the substrate. The electrical isolation surrounding the well includes (1) a second-type dopant isolation regions in a first type substrate surrounding and abutting the well, (2) a substrate doped with second type doping, and (3) dielectric isolation, such as deep trench, STI, and buried oxide layer. The well may be isolated by any of these methods separately or in combination.
摘要:
Use of different materials for different conductive films forming plates or electrodes of one or more capacitors formed in a trench in a body of semiconductor materials allow connections to be made selectively to the plates. The films may be undercut by different etchants at respective connection apertures to avoid formation of connections or connections made by doped polysilicon of different conductivities forming connections to some plates of similarly doped polysilicon and blocking diode junctions with oppositely doped polysilicon. The blocking diodes may include a compensation implant to adjust reverse breakdown characteristics and provide transient and electrostatic discharge protection.
摘要:
A semiconductor structure having a substrate, an insulator above a portion of the substrate, a conductor above the insulator; and at least two contact regions in the substrate on opposite sides of the portion of the substrate, wherein a voltage between the contact regions modulates a capacitance of the conductor.
摘要:
An assembly is provided that includes an interposer having first and second substantially flat, opposed surfaces, and at least one speed critical signal line extending directly through the interposer from the first surface to the second surface. A first IC is coupled to the first surface of the interposer and has a first external connection mechanism coupled to the at least one speed critical signal line. A second IC is coupled to the second surface of the interposer and has a first external connection mechanism coupled to the at least one speed critical signal line. Preferably at least one non-speed critical signal line is provided within the interposer and is coupled to a second external connection mechanism of the first IC and/or the second IC for delivering non-speed critical signals thereto or for receiving such signals therefrom. A chip carrier having a cavity formed therein also may be provided wherein the second surface of the interposer is coupled to the chip carrier and the second IC is disposed within the cavity. One or more carrier signal lines may be provided within the chip carrier and coupled between the interposer and the second IC. The first and/or the second IC also may comprise control logic adapted to select a number of drivers within either IC that drive a particular signal line.
摘要:
An off-chip driver circuit including an enhancement PFET, a depletion PFET, a depletion NFET and an enhancement NFET connected in series. The large enhancement PFET and large enhancement NFET turn off the OCD in tri-state and to turn off the unused half of the OCD to prevent overlap current when driving a ‘0’ or a ‘1’. A first gate signal is applied to the gate of the enhancement PFET and a second gate signal is applied to the enhancement NFET. A fixed voltage is connected to the gate of the depletion NFET and ground to gate of the depletion PFET. An output signal is obtained from a node between the depletion PFET and depletion NFET devices. In another embodiment, a reflection/overshoot sensor 60 is added. The output of sensor is connected to the body of a depletion PFET and an NFET. The feedback from sensor is such that the threshold voltage of the depletion devices are made more positive if the sensor detects that the output is being over-driven. A more positive threshold voltage will reduce the driver's IDS, but leaves the device in the linear mode.
摘要:
An automatic driver adjuster and methods using the same are provided that modify off-chip drivers based on load characteristics. The preferred embodiments are preferably automatic and require little or no human intervention. Preferred embodiments of the current invention analyze and determine the impedance of a node and adjust a number of output drivers in response to the impedance of the node, or analyze a resultant waveform of the node, caused by an input waveform, and adjust a number of output drivers in response to the resultant waveform of the node.
摘要:
A programmable element that has a first diode having an electrode and a first insulator disposed between the substrate and said electrode of said first device, said first insulator having a first value of a given characteristic, and an FET having an electrode and a second insulator disposed between the substrate and said electrode of said second device, said second insulator having a second value of said given characteristic that is different from said first value. The electrodes of the diode and the FET are coupled to one another, and a source of programming energy is coupled to the diode to cause it to permanently decrease in resistivity when programmed. The programmed state of the diode is indicated by a current in the FET, which is read by a sense latch. Thus a small resistance change in the diode translates to a large signal gain/change in the latch. This allows the diode to be programmed at lower voltages.
摘要:
A differential receiver for sensing small input voltage swings by using a built in reference voltage obtained by a difference in threshold voltage between a differential pair of closely spaced transistors. The difference in threshold voltage can be produced by different values of ion implantation of the gates of the transistor pair with the same material, or by dosages using different materials. The difference in threshold voltage can also be obtained by using different transistor channel lengths. The threshold voltages can also be modulated by the control of the transistor substrate voltages using a voltage control substrate means.