摘要:
A method for separately calibrating an optical model and a resist model of lithography process using information derived from in-situ aerial image measurements to improve the calibration of both the optical model and the resist model components of the lithography simulation model. Aerial images produced by an exposure tool are measured using an image sensor array loaded into the exposure tool. Multiple embodiments of measuring aerial image information and using the measured aerial image information to calibrate the optical model and the resist model are disclosed. The method of the invention creates more accurate and separable optical and resist models, leading to better predictability of the pattern transfer process from mask to wafer, more accurate verification of circuit patterns and how they will actually print in production, and more accurate model-based process control in the wafer fabrication facility.
摘要:
Methods are disclosed to create efficient model-based Sub-Resolution Assist Features (MB-SRAF). An SRAF guidance map is created, where each design target edge location votes for a given field point on whether a single-pixel SRAF placed on this field point would improve or degrade the aerial image over the process window. In one embodiment, the SRAF guidance map is used to determine SRAF placement rules and/or to fine tune already-placed SRAFs. In another embodiment the SRAF guidance map is used directly to place SRAFs in a mask layout.
摘要:
Switch mode power converter system and method thereof. The system includes one or more isolation boxes including at least a first isolation box, an input primary winding for receiving an input signal for the switch mode power converter system, and an output secondary winding for generating an output signal for the switch mode power converter system. The switch mode power converter system is configured to convert the input signal to the output signal. One of the input primary winding and the output secondary winding is substantially enclosed in the first isolation box, and the other of the input primary winding and the output secondary winding is not enclosed in the first isolation box. The first isolation box is conductively connected to a constant-voltage source.
摘要:
System and method for providing stable control for power systems. According to an embodiment, the present invention provides an apparatus for providing one or more control signals for a power system. The apparatus includes an input terminal for receiving an electrical energy, which can be characterized by a first input voltage. The apparatus includes a control component that is configured to generate a first control signal based on at least information associated with the first input voltage. The apparatus additionally includes an output terminal for sending the first control signal. Moreover, the apparatus includes a timing component that is coupled to the control component. The control component is configured to process at least information associated with a first value of the first input voltage at a first time and a first reference voltage and to generate a second control signal.
摘要:
System and method for protecting a power converter. The system includes a compensation system configured to receive an input signal and generate a control signal, a cycle threshold generator configured to receive the control signal and generate a cycle threshold, and a comparator configured to receive the cycle threshold and a feedback signal and generate a comparison signal. Additionally, the system includes a pulse-width-modulation generator configured to receive the comparison signal and generate a modulation signal in response to the comparison signal, and a switch configured to receive the modulation signal and control an input current for a power converter. The input current is associated with an output power for the power converter. The cycle threshold corresponds to a threshold power level for the output power. The threshold power level is constant, decreases, or increases with respect to the input signal.
摘要:
A Video and Audio Front End Assembly and Method. The device and method of this invention takes advantage of the hardware improvements available in personal computing machines that enable higher speed bus communications and much greater computational capacity. The system converts many of the processes needed to convert analog video and audio inputs so that they are displayable by a personal computer from a hardware integrated circuit to a set of software routines. The system combines a simplified hardware front-end interface between the computer and the analog input signals and a very flexible set of software applications running on the host computer. The hardware front end employs an integrated circuit device that is much lower in complexity and cost than the conventional audio/video decoder integrated circuit. The software back end provides performance that is equal to the prior hardware-based systems, while also having the substantial benefit of being upgradable at virtually no cost to respond to changing user requirements and technological evolutions in the decoding arena.
摘要:
In one aspect, the present invention is a sensor unit for sensing process parameters of a process to manufacture an integrated circuit using integrated circuit processing equipment. In one embodiment, the sensor unit includes a substrate having a wafer-shaped profile and a first sensor, disposed on or in the substrate, to sample a first process parameter. The sensor unit of this embodiment also includes a second sensor, disposed on or in the substrate, to sample a second process parameter wherein the second process parameter is different from the first process parameter. In one embodiment, the sensor unit includes a first source, disposed on or in the substrate, wherein first source generates an interrogation signal and wherein the first sensor uses the interrogation signal from the first source to sample the first process parameter. The sensor unit may also include a second source, disposed on or in the substrate, wherein second source generates an interrogation signal and wherein the second sensor uses the interrogation signal from the second source to sample the second process parameter. The first sensor and the first source may operate in an end-point mode or in a real-time mode. In this regard, the first sensor samples the first parameter periodically or continuously while the sensor unit is disposed in the integrated circuit processing equipment and undergoing processing. In one embodiment, the first sensor is a temperature sensor and the second sensor is a pressure sensor, a chemical sensor, a surface tension sensor or a surface stress sensor.
摘要:
Methods are disclosed for selecting and optimizing an exposure tool using an individual mask error model. In one embodiment, a method includes selecting a model of a lithography process including an optical model of an exposure tool and a resist model, creating an individual mask error model representing a mask manufactured using mask layout data, simulating the lithography process using the model of the lithography process and the individual mask error model to produce simulated patterns, determining differences between the simulated patterns and a design target, and optimizing settings of the exposure tool based on the differences between the simulated patterns and the design target.
摘要:
A method for identifying process window signature patterns in a device area of a mask is disclosed. The signature patterns collectively provide a unique response to changes in a set of process condition parameters to the lithography process. The signature patterns enable monitoring of associated process condition parameters for signs of process drift, analyzing of the process condition parameters to determine which are limiting and affecting the chip yields, analyzing the changes in the process condition parameters to determine the corrections that should be fed back into the lithography process or forwarded to an etch process, identifying specific masks that do not transfer the intended pattern to wafers as intended, and identifying groups of masks that share common characteristics and behave in a similar manner with respect to changes in process condition parameters when transferring the pattern to the wafer.
摘要:
A method for separately calibrating an optical model and a resist model of lithography process using information derived from in-situ aerial image measurements to improve the calibration of both the optical model and the resist model components of the lithography simulation model. Aerial images produced by an exposure tool are measured using an image sensor array loaded into the exposure tool. Multiple embodiments of measuring aerial image information and using the measured aerial image information to calibrate the optical model and the resist model are disclosed. The method of the invention creates more accurate and separable optical and resist models, leading to better predictability of the pattern transfer process from mask to wafer, more accurate verification of circuit patterns and how they will actually print in production, and more accurate model-based process control in the wafer fabrication facility.