What are the characteristics of Verilog HDL?
The biggest feature of Verilog HDL is that it is easy to learn and use. If you have programming experience in C language, you can learn and master it quickly in a short period of time. Therefore, the content of Verilog HDL can be arranged in courses related to ASIC design and so on. Teaching. Since the HDL language itself is specially designed for hardware and system design, this arrangement allows learners to gain experience in designing actual circuits at the same time.
What is included in the CPU Interrupt Enable Register?
The enable bit of all maskable CPU interrupts (INTl~INTl4, RTOSINT and DLOGINT).
What are the characteristics of WOLED lighting?
- WOLED lighting needs to achieve uniform surface emission without fine pixel control. Therefore, it can be displayed with color blocks, but this also makes the impact of defects on the lighting device much greater than that on the display device. Therefore, How to control defects to achieve uniform light emission in the plane and the corresponding circuit design are different from OLED display applications.
- WOLED is a current-type component, and the lighting device needs to work for a long time. After working for a period of time, its luminous brightness will decay, resulting in a decrease in lighting quality. It is necessary to adjust the driving conditions in time to maintain a stable lighting effect. In OLED lighting The method of modulation in the device requires special consideration.
- Lighting has high requirements on the brightness and life of the components. Only by maximizing the light output efficiency and meeting the practical requirements can the application be truly realized.
What are the two types of liquid level sensors in a car?
Analog output type and switch type.
What are the power drive methods?
- Low voltage drive LED.
- Transition voltage drives LED.
- High voltage drive LED.
- Mains drive LED.
What are the application areas of PLC?
At present, PLC has been widely used in steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection and other industries. With the continuous improvement of its cost performance, its application fields are constantly expanding, such as switching logic control, motion control, process control, data processing, communication networking, etc.
The essence of dynamic calibration is to determine the dynamic parameters of the sensor experimentally.What are the two methods of this type?
The essence of dynamic calibration is to determine the dynamic parameters of the sensor by means of experiments. There are two such methods:
The first is to excite the sensor with a known step pressure signal, so that the sensor vibrates according to its own natural frequency, and records the motion state to determine its dynamic parameters;
The second is to excite the sensor with a sinusoidal pressure signal whose amplitude and frequency are both known and adjustable, and determine the dynamic characteristics of the sensor according to the recorded motion state.
Which modules are the main components of the BER tester?
The BERT is mainly composed of a source transceiver module, a liquid crystal display module, a print output module and a keyboard control module.
What are the commonly used optical paths for gratings?
- Vertical transmission optical path
- Reflective optical path
Method for identifying three poles of thyristor：
The method to identify the three poles of the thyristor is very simple. According to the principle of the P-N junction, just use a multimeter to measure the resistance value between the three poles.
The forward and reverse resistances between the anode and the cathode are more than a few hundred thousand ohms, and the forward and reverse resistances between the anode and the control electrode are more than a few hundred thousand ohms (there are two P-N junctions between them, and the direction On the contrary, the anode and the control electrode are not connected in the forward and reverse directions).
There is a P-N junction between the control electrode and the cathode, so its forward resistance is in the range of several ohms to several hundred ohms, and the reverse resistance is larger than the forward resistance. However, the characteristics of the gate diode are not ideal, the reverse is not completely blocked, and a relatively large current can pass through. Therefore, sometimes the measured reverse resistance of the control electrode is relatively small, which does not mean that the control electrode characteristics are not good.
In addition, when measuring the forward and reverse resistance of the control electrode, the multimeter should be placed in the R10 or R1 block to prevent reverse breakdown of the control electrode when the voltage is too high. If it is detected that the cathode and anode of the element are short-circuited in the forward and reverse directions, or the anode and the control electrode are short-circuited, or the control electrode and the cathode are reversely short-circuited, or the control electrode and the cathode are open-circuited, it indicates that the element is damaged.
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