Transistor is the name of semiconductor triode, is the internal containing two PN junction, the external is usually three lead out of the semiconductor device. It is widely used for amplifying and switching electrical signals. Compared with vacuum tube, transistor has many advantages and is easy to use. The Positioning Transistors to tell you the advantages of the transistor.
Advantages of transistors
1. No component consumption
A tube, no matter how good, will deteriorate with changes in cathode atoms and chronic air leakage. For technical reasons, transistors were made with the same problem in mind. With advances in materials and improvements in many ways, transistors typically last 100 to 1,000 times longer than tubes, worthy of the name of permanent devices.
2. Very little electricity is consumed
It is only a tenth or a tenth of the valve. It doesn't need to heat a filament to produce free electrons, like a tube does. A transistor radio can be listened to for six months and a year with only a few dry batteries, which is difficult for a vacuum tube radio.
Do not need to preheat
Work as soon as you turn it on. For example, a transistor radio will sound as soon as it is turned on, and a transistor television will soon show a picture. Vacuum tube devices can't do that. After the boot, have to wait a while to hear the sound, see the picture. Obviously, the transistor is very advantageous in military, measurement, recording, etc.
3. Firm and reliable
100 times more reliable than the tube, shock resistance, vibration resistance, which is the vacuum tube can not be compared. In addition, transistors are only one-tenth to one-hundredth of the size of a vacuum tube and have little heat release. They can be used to design small, complex and reliable circuits. Although the transistor manufacturing process is precise, but the process is simple, is conducive to improving the installation density of components.
The importance of transistors
A transistor, originally called a semiconductor triode, is a semiconductor device containing two PN junctions inside and usually three lead electrodes outside. It is widely used for amplifying and switching electrical signals. The input stage and output stage adopt the transistor logic circuit, which is called the transistor-transistor logic circuit. It is referred to as TTL circuit in books and applications. It belongs to one kind of semiconductor integrated circuit, among which TTL and non-gate are most commonly used. TTL and non-gate are circuits composed of several transistors and resistance elements, which are manufactured on a small piece of silicon and packaged into a single component. The transistor is one of the most widely used components in the semiconductor transistor. V” Or & other VT” (the old character symbol is “ Q” , & other GB” And so on).
The transistor is considered to be one of the greatest inventions in modern history, comparable in importance to the inventions of printing, the automobile and the telephone. The transistor is, in fact, the key acTIve element in all modern electrical appliances. The importance of transistors in today's society is largely due to their ability to use highly automated processes for mass production, and thus incredibly low unit costs.
Although millions of individual transistors are still in use, the vast majority of transistors are connected to diodes. Zh-tw: diode}-, resistance, capacitance together are assembled on a microchip (chip) to make a complete circuit. Analog or digital or both are integrated on the same chip. The cost of designing and developing a complex chip is high, but when spread over millions of units, the cost per chip is minimal. A logic gate contains 20 transistors, compared with 289m in 2005 for an advanced microprocessor.
In particular, the power of the transistor in military planning and space flight is increasingly revealed, in order to compete for the dominance of the electronic field, the world has launched a fierce competition. In order to realize the miniaturization of electronic equipment, people do not hesitate to give huge financial support to the electronic industry.
Since Fleming invented the vacuum diode in 1904 and DE forest invented the vacuum transistor in 1906, electronics has developed rapidly as a new discipline. But the real leap forward in electronics came after the transistor was invented. In particular, the appearance of PN junction transistor has opened up a new era of electronic devices and caused an electronic technology revolution. In a short period of more than a decade, the emerging transistor industry, with its unbeatable ambition and youthful recklessness, quickly replaced the position that the tube industry had been striving for for many years, and rose to the forefront of the field of electronic technology.