摘要:
An LDMOS device and method of fabrication are provided. The LDMOS device has a substrate with a source region and a drain region formed in the substrate. An insulating layer is provided on a portion of the substrate between the source and the drain region, such that a planar interface is provided between the insulating layer and a surface of the substrate. An insulating member is then formed on a portion of the insulating layer, and a gate layer is formed over part of the insulating member and the insulating layer. By employing such a structure, it has been found that a flat current path exists which enables the on-resistance to be decreased while maintaining a high breakdown voltage.
摘要:
The invention is directed to a method for forming a memory array. The method comprises steps of providing a substrate having a charge trapping structure formed thereon. A patterned material layer is formed over the substrate and the patterned material layer having a plurality of trenches expose a portion of the charge trapping structure. Furthermore, a plurality of conductive spacers are formed on the sidewalls of the trenches of the patterned material layer respectively and a portion of the charge trapping structure at the bottom of the trenches is exposed by the conductive spacers. An insulating layer is formed over the substrate to fill up the trenches of the patterned material layer. Moreover, a planarization process is performed to remove a portion of the insulating layer until a top surface of the patterned material layer and a top surface of each of the conductive spacers are exposed.
摘要:
A semiconductor device includes a first well region of a first conductivity, a second well region of a second conductivity type, a source region of the second conductivity type within the first well region, and a drain region of the second conductivity type at least partially within the second well region. A well contact to the first well region is coupled to the source. A first doped region of the first conductivity type and a second doped region of the second conductivity type are located in the second well region. A first transistor includes the first doped region, the second well region, and the first well region. The first transistor is coupled to a switch device. A second transistor includes the second well region, the first well region, and the source region. The first and the second transistors are configured to provide a current path during an ESD event.
摘要:
In an ESD protection structure and method utilizing substrate triggering for a high-voltage tolerant pad on a substrate, an ESD protection device has a source connected to the pad and a gate and a drain both connected to a ground, and a substrate-triggering control circuit is used to keep the substrate at a low voltage during a normal operation, and pumping the substrate to a high voltage during an ESD event for the ESD protection device to be triggered much easier. The substrate-triggering control circuit is implemented with an active device, thereby reducing the chip size for the circuit and the loading effect on the pad.
摘要:
An LDMOS device and method of fabrication are provided. The LDMOS device has a substrate with a source region and a drain region formed in the substrate. An insulating layer is provided on a portion of the substrate between the source and the drain region, such that a planar interface is provided between the insulating layer and a surface of the substrate. An insulating member is then formed on a portion of the insulating layer, and a gate layer is formed over part of the insulating member and the insulating layer. By employing such a structure, it has been found that a flat current path exists which enables the on-resistance to be decreased while maintaining a high breakdown voltage.
摘要:
An operation method of a non-volatile memory is provided. The operation method is that a reading operation is performed to a selected nitride-based memory cell, a first positive voltage is applied to a word line adjacent to one side of the selected memory cell and a second positive voltage is applied to another word line adjacent to the other side of the selected memory cell. The operation method of this present invention not only can reduce a coupling interference issue but also can obtain a wider operation window.
摘要:
A method for measuring intrinsic capacitance of a MOS device is provided. The MOS device includes a first terminal, a second terminal, a third terminal and a fourth terminal. First, provide a first input signal to the second terminal and ground the third terminal and fourth terminal. Then, charge the first terminal and measure a first current required for charging the first terminal. Afterward, provide a second input signal to the second terminal, ground the third terminal and the fourth terminal, and measure a second current required for charging the first terminal, wherein the first input signal and the second input signal have the same low level, but different high levels. Finally, determine intrinsic capacitance between the first terminal and the second terminal according to the first current, the second current and a high level difference between the first input signal and the second input signal.
摘要:
An ESD protection apparatus for a high-voltage input pad comprises a modulator connected between the input pad and a snapback device with first and second guard rings surrounding the modulator, third guard ring surrounding the snapback device, and first and second guard ring control circuits to control the guard rings such that the protection apparatus has higher triggering and holding voltages under normal operation and lower triggering and holding voltages under ESD event.
摘要:
A process and a memory architecture for operating a charge trapping memory cell is provided. The method for operating the memory cell includes establishing a high threshold state in the memory cell by injecting negative charge into the charge trapping structure to set a high state threshold. The method includes using a self-converging biasing procedure to establish a low threshold state for the memory cell by reducing the negative charge in the charge trapping structure to set the threshold voltage for the cell to a low threshold state. The negative charge is reduced in the memory cell by applying a bias procedure including at least one bias pulse. The bias pulse balances charge flow into and out of the charge trapping layer to achieve self-convergence on a desired threshold level. Thereby, an over-erase condition is avoided.
摘要:
The invention discloses an ESD (Electro Static Discharge) protection circuit, including a resistor device, a capacitor device and a PMOS device. The resistor device is connected in series between a power supply and the capacitor device. The capacitor device is connected in series between the resistor device and the ground. A gate electrode of the PMOS device is connected between the resistor device and the capacitor device. A bulk electrode of the PMOS device is interconnected to a first electrode of the PMOS device, and the first electrode is connected to the power supply. Alternatively, another ESD protection circuit for multiple power supplies includes at least two aforementioned ESD protection circuits, and a common ESD bus. The ESD protection circuits are connected to separate power supplies, and both connected to the common ESD bus. By using the ESD protection circuit, there is no noise between the separate power supplies, and an ESD current could be discharged easily and safely.