1, market demand and treatment for engineers skilled in advanced testing machines, the current market treatment is good. The specific salary can be understood through recruitment websites such as 51job or Liepin, and communicate with HR in person to get more accurate information.
2, the prospect of chip IC test engineers is still good. Test engineer, the gatekeeper of software quality, has a high starting point and large development space. The software testing profession in our country is still in a stage of development, so testingTest engineers have great prospects for development. The traditional software industry is still dominated by software test engineers, but in the emerging Internet industry, most of the positions are still named after QA, that is, quality assurance.
3, test engineers in the current demand, there are more gaps. However, the test engineer is not suitable for long-term employment. After making great progress as a test engineer, you need to start to transition to other professional development and continue to improve in IC testing, such as senior test engineer, test manager, and test supervisor. Or switch to IC design engineers who require a higher level of competence. It's all test engineersRequires further effort.
1, verification process details verification engineers' experience, detailed analysis of the six key dimensions of chip verification: scenario testing, functional verification, performance evaluation, white box test points provided by designers, interface inspection and exception handling. Each test point is carefully divided with explicit directtest, coverage, or assertion coverage to ensure unambiguous execution.
2, mustSkills include: a keen logical mind, proficiency in design validation languages such as Verilog and SVA, application of scripting languages such as Python or Perl, and familiarity with common communication protocols. In addition, the ability to understand the validation process and build the platform is also essential. For beginners, learning validation skills is not easy, and the investment of time and effort is high. Therefore, it is particularly important to choose professional training courses and pay attention to practice.
3, in the tool selection, NCVerilog, VCS, ModelSim, iVerilog (open source selectionItem, covering a variety of Settings) is your simulation partner; For waveform viewing, DVE, Verdi and gtkWave (support standard and compressed formats) provide detailed signal analysis; formality is a powerful tool for formality in the logical verification stage. Step into the world of IC, first understand the infrastructure: integrated circuits, like the Swiss Army knife in the field of electronics, its construction process is divided into three key parts: passive components, active components and packaging technology. Let's unveil it step by step: Design: Start at the design stage and use advanced EDA 0.1-0.5μF isolated DC capacitance can be inserted into the positive pen. This method is suitable for ics with relatively low operating frequencies. However, it should be noted that these signals will be subject to natural frequencies and will differ from waveform to waveform. So the measured data are approximate values.
The positive and negative resistance values between the pins of the IC chip are measured offline. It is compared with a good IC chip to find the fault point. On-line detection of DC resistance is the same as offline detection.
Offline detection: The positive and negative resistance values between the pins of the IC chip are measured. This is compared with a good IC chip, thusLocate the fault. Online detection: To disconnect the power supply on the circuit board to be tested, the internal voltage of the multimeter should not be greater than 6V, and pay attention to the influence of the periphery when measuring. Such as potentiometer connected with IC chip, etc. Ac operating voltage: Use a multimeter with dB file to measure the AC voltage approximation of the IC.
Motherboard maintenance method and IC good or bad judgment method Check board method: 1. Observation method: there is no burning, burning, foaming, plate surface broken line, socket rust. 2. Meter measurement: Whether +5V, GND resistance is too small (below 50 ohms). 3. Power check: YesIt is clear that the board has been broken, you can slightly increase the voltage 0.5-1V, and rub the IC on the board with your hand after starting up, so that the chip in question is hot, so as to sense it.
Disconnect the power supply before measuring to avoid damage to the meter and components during the test. (2) The internal voltage of the multimeter electric block shall not be greater than 6V, and the range is best to use R×100 or R×1k. (3) When measuring IC pin parameters, pay attention to the measurement conditions, such as the model under test, the position of the sliding arm of the potentiometer related to the IC, etc., but also consider the quality of the peripheral circuit components.
2, different responsibilities, different focus. Electronics engineers and hardwareEngineers differ in their duties. Electronic engineers are mainly responsible for the design, development and maintenance of electronic equipment and systems, including circuit design, electronic component selection and integrated circuit design. Hardware engineers are mainly responsible for the design, development and testing of computer hardware, including motherboards, chips, circuit boards and other hardware components.
3, the difference between vivoS12pro and vivoS12: photography: vivoS12 front using 44 million pixels of 8MP ultra-wide Angle, vivoS12pro front using 50 million pixels of 8MP main cameraSuper wide Angle, the rear cameras of the two are basically the same, but the vivoS12pro front-facing photo effect is greater than the vivoS12 front-facing photo effect, and the main role of the front is for selfies. In terms of hardware: vivoS12 is equipped with Tianguet 1100 processor, the main frequency is up to 6.
4, different responsibilities, different areas of focus. Hardware engineers are mainly responsible for the design, development and testing of computer hardware systems, including circuit boards, chips, power supplies, etc., ic chip testing They are concerned with the physical structure and functional realization of the hardware. While electronEngineers are more focused on the design and development of electronic equipment, including circuit design, signal processing, selection of electronic components, etc., they are concerned about the circuit and signal processing of electronic systems.
2, offline detection of the IC chip between the pin to the ground between the positive and negative resistance value. It is compared with a good IC chip to find the fault point. On-line detection of DC resistance is the same as offline detection.
3, offline detection ic chip test : test the positive and negative resistance value between the pins of the IC chip to the ground. This is compared with a good IC chip, so as to find the reasonObstacle point. Online detection: To disconnect the power supply on the circuit board to be tested, the internal voltage of the multimeter should not be greater than 6V, and pay attention to the influence of the periphery when measuring. Such as potentiometer connected with IC chip, etc. Ac operating voltage: Use a multimeter with dB file to measure the AC voltage approximation of the IC.
The positive ic chip test between the pins of the ic chip and the ground is detected offlinetrong>ic chip test , back resistance value. This is compared with a good IC chip to find the fault point ic chip test ; On-line detection of DC resistance is the same as offline detection.
Offline detection ic chip test : The positive and negative resistance values between the pins of the IC chip are measured. It is compared with a good IC chip to find the fault point. Online detection: To disconnect the power supply on the circuit board to be tested, the internal voltage of the multimeter must not be greater than 6VWhen measuring, pay attention to the influence of the periphery. Such as potentiometer connected with IC chip, etc. Ac operating voltage: Use a multimeter with dB file to measure the AC voltage approximation of the IC.
This method overcomes the limitations of substitutable IC and the trouble of disassembling IC by substitution test method, and is the most common and practical method for detecting IC. 1. In the circuit DC resistance detection method This is a multimeter ohm gear, directly on the circuit board to measure the positive and negative DC resistance value of the IC pins and peripheral components, and compared with normal data, to find and determine the fault method.
Use a multimeter to test connectivity between chip pins. Set the multimeter to the test resistance position, connect one probe to the pin of the chip, and the other probe touches the ic chip in turn to test the pin, and observe whether the resistance value displayed by the multimeter is normal. If the resistance value of any of the pins is abnormal, then the chip may be damaged. Use a multimeter to test the voltage of the chip.
Motherboard maintenance method and IC good or bad judgment method Check board method: 1. Observation method: There is no burning, burning, foaming, plate surface broken line, socket rustCorrosion. 2. Meter measurement: Whether +5V, GND resistance is too small (below 50 ohms). 3. Power inspection: For the clear broken board, the voltage can be slightly increased by 0.5-1V, and the IC on the board can be rubbed by hand after starting up to make the chip in question hot, so as to perceive it.