摘要:
A method for removing plasma etching-induced residues. In one embodiment, after a portion of photoresist has been used to form a polysilicon gate, the present invention provides a novel and advantageous plasma ashing environment. Specifically, in this embodiment, the present invention introduces CF4 into the plasma ashing environment. Next, the present embodiment introduces H20 vapor into the plasma ashing environment. In this embodiment, the ratio by volume of the CF4 to the H20 is in the range of from 0.1:1 to 10:1. Next, the present embodiment uses the plasma ashing environment to substantially remove polysilicon etch-induced residues without requiring an aggressive chemical strip. In so doing, the etching of the gate oxide is significantly suppressed such that a sufficient amount of the gate oxide layer remains above the underlying semiconductor substrate. Additionally, in the present invention, after the removal of the plasma etching-induced residues, the gate oxide layer is clean and enough gate oxide remains such that the thickness of the remaining gate oxide layer can be accurately and reliably measured.
摘要:
An electronic part includes an integrated circuit that has bond pads. A wire bonded package contains the integrated circuit. The wire bonded package includes bond fingers. A second row of bond fingers is located between a first row of bond fingers and a third row of bond fingers. Each bond finger in the third row of bond fingers is electrically connected to a corresponding bond finger in the first row of bond fingers. Wire bonds connect bond pads to bond fingers from the first row of bond fingers, the second row of bond fingers and the third row of bond fingers.
摘要:
A method for determining rotational error portion of total misalignment error in a stepper. In one embodiment, the method comprises a series of steps in a stepper, starting with the step of receiving a wafer, having a first pattern and an error-free fine alignment target, in the stepper. In another step, the wafer is aligned in the stepper using the error-free fine alignment target. Then a second pattern is created on the wafer overlaying said first pattern. In another step, the rotational error portion of the total misalignment error is determined by measuring the circumferential misalignment between the first pattern and the second pattern.
摘要:
The die pad crack absorption integrated circuit chip fabrication system and method of the present invention minimizes the spread of cracks between layers of an integrated circuit chip. During an integrated circuit chip fabrication process relatively elastic material is deposited in modular elastic filler blocks located between intermetal oxide (IMO) layers of an integrated circuit chip. The modular elastic filler blocks comprise material with a lesser elastic modulous than the surrounding IMO material. These elasticity characteristics and modular configuration of the modular elastic filler blocks results in the modular elastic filler blocks being more flexible than adjacent materials and having a greater capacity to dissipate stress energy that propels cracking forces through layers of an integrated chip. By absorbing the stress energy,the modular elastic filler blocks reduce the spread of crack through the layers of an integrated chip.
摘要:
In the fabrication of a 0.10 micron CMOS integrated circuit (IC), a high-energy plasma etch is used to pattern a polysilicon layer (25) and an underlying gate oxide layer (23) to define gate structures. A thermal oxide step (S2) anneals silicon exposed and damaged by this etch. Instead of using this thermal oxide as a blocking layer for a source/drain extension implant, it is removed (S3) so as to expose the silicon surfaces of the source/drain regions. A TEOS deposition (S4) results in a carbon-bearing silicon dioxide layer (51) in contact with the surfaces of the crystalline source/drain regions. A boron PMOS source/drain extension implant (S5) is performed through this carbon-bearing blocking layer. Subsequent steps (S6-S9) result in the formation of sidewall spacers (71), heavily doped deep source/drain sections (91, 93), submetal dielectric (81), an intermetal dielectric interconnect structure, and passivation. The relatively high interstitial recombination rate of the carbon-bearing blocking layer attracts a flow of interstitial silicon. This flow draws some of the boron extension implant with it - effectively limiting the depth and lateral extension (under the gate) of the boron. This, in turn, helps limit the short-channel effect, and yields a more reliable 0.1 micron PMOS transistor.
摘要:
A novel and sophisticated direct memory access (DMA) controller that can operate in either "fly-by" mode, "dual-cycle" mode, or "flow-through" mode. The DMA controller of the present embodiment supports a parametrizable number of channels, each of the channels providing support for one of the prior-noted modes of operation. The DMA controller of the present embodiment serves as bus master on the host bus and has the ability to interface with all the devices on the system. The DMA controller of the present embodiment is also optimized for zero wait state sequential transfers on the host bus. Further, the DMA controller of the present embodiment also houses an internal arbiter with programmable priority to choose arbitrate between the different channels, should more than one master that interface to the DMA controller request access to the host bus. An advantage of the present invention is that, because bus master devices are be off-loaded from the host bus, system performance can be dramatically improved. Another advantage is that the present invention provides an easy means for adding more devices to the system.
摘要:
A transistor structure having dimensions below about 100 nm is provided. The transistor structure comprises a substrate (100) with a first polarity. The substrate includes a shallow halo implant (108) having the first polarity defined at a first depth within the substrate. The substrate also has a deep halo implant (112) which is the same polarity as the substrate and is defined to a second depth deeper than the first depth of the shallow halo implant. The shallow halo implant and the deep halo implant allow a peak concentration of substrate impurities at a level below the gate such that the resistance of the transistor is minimized along with the threshold voltage, short channel effects and leakage current in the transistor.
摘要:
A clock synchronization circuit for synchronizing a first communications device and a second communications device to enable digital communication between the devices. The clock synchronization circuit includes an oscillator circuit adapted to generate a base clock signal. A first frequency divider is coupled to the oscillator circuit. The first frequency divider generates a first divider clock signal from the base clock signal. A phase comparison circuit is coupled to receive the first divider clock signal. Additionally, the phase comparison circuit is also coupled to the oscillator circuit to control the frequency of the base clock signal. The phase comparison circuit receives a reference clock signal from a first communications device and adjusts the base clock frequency to correct a phase difference between the first divider clock signal and the reference clock signal. The clock synchronization circuit further includes a second frequency divider coupled to the oscillator circuit. The second frequency divider is adapted to generate a second divider clock signal from the base clock signal, wherein the second divider clock signal varies in response to the correcting performed on the base clock signal by the phase comparison circuit. The second frequency divider subsequently provides the second divider clock signal to a second communications device such that the first communications device and the second communications device are synchronized.