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VLSI Definitions
           Definitions of the terms that are often used in Chip design world. Please help us to improve the list. You can add VLSI terms and its definitions with out registering in the site.

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There are 257 entries in the glossary.
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Term Definition
3DThe representation of objects in a space by length, width, and height (three planes).
3GThe phase of wireless communications expected to be prevalent by 2005. It will feature 2Mbps+ wireless data transfer speeds, full roaming throughout Japan, the U.S., and Europe, enhanced multimedia capabilities.
8 bitsA measure of memory. 8 bits make up 1 byte, and offer 256 (2^8) different combinations.
A-WeightingA-weighting is a standard weighting curve applied to audio measurements, designed to reflect the response of the human ear.
ABSAntilock Breaking System is a system in vechicles which prevent the wheels from locking during breaking condition. With ABS the driver can have steering control over the wheels even during heavy breaking. In this system break pressure is applied and released typically 20 times per second, thus a continuous steerability is gauranteed.
AccelerometerA sensor or transducer for measuring acceleration.
Acceptance testingTesting performed on a product or equipment to determine whether an individual lot of the product or equipment conforms with specified requirements.
AccuracyIn statistical process control, the compliance of the measured or observed value to the true value or accepted reference value.
Active areaThe region of thin oxide on a die or wafer in which transistors and other circuits reside.
Active devicessemiconductor devices that have active function, such as integrated circuits and transistors. Contrast passive devices.
Actuation cycleThe full operation of a valve, such as from a fully opened position to fully closed and back to fully opened.
ADCAn analog-to-digital converter is an electronic circuit that converts continuous signals to discrete digital numbers.
AlgorithmA set of precisely defined rules, processes, or operations for solving a problem in a finite number of steps.
AliasIn A/D conversion, the Nyquist principle states that the sampling rate must be at least twice the maximum bandwidth of the analog signal. If the sampling rate is insufficient, then higher-frequency components are \"undersampled\" and appear shifted to lower-frequencies. These frequency-shifted components are called aliases.
Align exposeAn operation in a lithography process during which a resist-coated substrate is put into proper relative position or orientation to a reticle and exposed to light.
AMBAAMBA is designed for use in System-on-a-chip (SoC) systems. The important aspect of a SoC is not which components or blocks it houses, but how they are implemented. AMBA is a solution for the blocks to interface with each other.
Amplitude ModulationA modulation method in which the carrier amplitude changes with the input signal amplitude.
Analog semicustomAnalog integrated circuits that can be specified by a designer using semicustom design techniques to meet a specific design requirement.
Analog signal processingProcessing of analog signals in the analog domain. Includes the capability of amplification, filtering, signal conditioning, multiplication. and comparison of analog signals.
Analytical modelA representation of a process or phenomenon by a set of solvable equations. Contrast simulation.
AnchorA point at which part of a MEMS device is secured to the substrate to prevent part from moving etc.
Anti-aliasingAn anti-aliasing filter is used before A/D conversion. It is a lowpass filter that removes signal components above the Nyquist frequency, thereby eliminating their sampled replicas in the baseband.
Application program interfaceA software layer that allows a system to be programmed via a defined set of commands.
ASCIIASCII is a character encoding based on the English alphabet. ASCII codes represent text in computers, communications equipment, and other devices that work with text.
ASICA chip that is custom designed for a specific application rather than a general-purpose chip such as a microprocessor. The use of ASICs improve performance over general-purpose CPUs, because ASICs are \"hardwired\" to do a specific job and do not incur the overhead of fetching and interpreting stored instructions. However, a standard cell ASIC may include one or more microprocessor cores and embedded software, in which case, it may be referred to as a \"system on a chip\" (SoC).
ATPGUsed in the testing and evaluation of the reliability and quality of a digital Integrated Circuit. Software and hardware tools are used to generate an appropriate subset of all input combinations, such that a desired percentage of faults is activated and observed at the outputs.
ATPGThe creation of signals by computer-run algorithm for use with an integrated circuit tester. ATPG signal sets are commonly developed in conjunction with a specific design- for-test technique, such as scan design.
Back-endA type of program or process that is not directly accessed by a user. Often it will carry out its tasks independently of the front-end or user interface.
Backside BusIn some architectures, such as Socket 7, the speed of the backside bus determined how fast the microprocessor could talk to its external L2 cache. Newer architectures, such as Slot 1 and most architectures today, have a dedicated L2 cache bus (or dedicated on-chip L2 cache), and a backside bus is no longer required at all.
Ball Grid Array:A style of chip package that sues an array of solder balls to achieve very high interconnect densities.

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