Thermistors are thermal elements made of semiconductor materials. Resistance value of thermistors can vary with the temperature of resistor bodies. Thermistors can be divided into three types: positive temperature coefficient thermistor (PTC), negative temperature coefficient thermistor (NTC) and critical temperature coefficient thermistor (CRT). NTC thermistor has the following advantages: (1)High sensitivity The absolute value of its temperature coefficient resistance is greater than that of t...(more)
A low DC voltage is added on the both sides of thermoelectric cooler ( TEC ) and heat will flow from one side of the component to the other side. At this time, the temperature on one side of TEC will decrease and the temperature on the other side will increase. It is noteworthy that as long as the current direction is changed, the heat flow direction can be changed. So a TEC can realize two functions, cooling and heating at the same time. TEC can be used for precise temperature control. Whats mo...(more)
High voltage power module is a kind of a power supply, which can be directly mounted on circuit boards. Power module can supply power for integrated circuit, digital signal processor, microprocessor, memory and other digital or analog load. Generally, this module is called load point power supply system or point power supply system. Power supply has been widely used for switching equipment, access devices, mobile communication, optical transmission, microwave communication, router and so on. Our...(more)
Thermal silicon is generally called heat conduction RTV adhesive, which is cured at room temperature and has a certain adhesion performance. Thermal silicon is a kind of silicone rubber. If it is exposed to air, it will be cured and it will be very difficult to separate the bonded object. Thermal grease is a kind of heat-conducting medium, which is based on organic silicone as raw materials. It has non-toxic, tasteless, non-corrosive, stable chemical and physical properties, excellent thermal co...(more)
In last article, some types of laser drivers have been introduced, low noise laser driver and constant current laser driver. This paper aims to the other two types laser drivers , high voltage constant current laser driver and AC input laser driver. III. High voltage constant current laser driver High voltage constant current laser drivers include two series, ATLSXA212 and ATLSXA214. Both of them have high input voltage than other laser drivers in ATI. ATLSXA212 has an input voltage between 4.75...(more)
Diode laser drivers are designed to drive diode lasers in a stable and efficient way. Based on different functions, laser drivers are divided into multiple types, among which DC input laser drivers include low noise diode laser drivers, high efficiency constant current laser drivers, high voltage constant current laser driver, constant current laser drivers; and AC input laser drivers. I. Low noise laser driver ATLSXXX103 and 104 are typical low noise laser drivers, which come with ultra low noi...(more)
With the development of science and technology, semiconductor laser technology has penetrate every field of national economy and defense construction. It has been applied in remote communication, laser radar, digital signal storage and recovery, laser ranging, robot, holographic application, medical diagnosis, etc. However, Its very demanding for semiconductor laser on its working conditions. If Its under improper work or storage condition, it will result in a sharp deterioration in performance...(more)
A laser driver is between multiplexer and laser, which completes electro-optical conversion function. In order to make the laser work well, the good driving signal needs to be provided, depending on the performance parameters of laser driver. The physical photo of laser driver The performance parameters of laser driver mainly include: (1)Working speed: the working speed of laser driver can be reflected by system bandwidth and the upper limit of working speed can increase with the bandwidth incre...(more)
