[introduction] base of technology of study simulation electron, related to electronic technology the friend of the domain, the commonnest when study compose builds power amplifier circuit electron yuan parts of an apparatus is dynatron and field effect canal (MOS is in charge of) . So what connection and distinction do dynatron and MOS canal have? How do we want to choose when compose builds power amplifier circuit?

Learn base of imitate electron technology, related to electronic technology the friend of the domain, the commonnest when study compose builds power amplifier circuit electron yuan parts of an apparatus is dynatron and field effect canal (MOS is in charge of) . So what connection and distinction do dynatron and MOS canal have? How do we want to choose when compose builds power amplifier circuit?

Above all the concept that we make clear both

Dynatron: Full name should be semiconductor dynatron, also say ambipolar model dynatron of transistor, crystal, it is a kind of semiconductor device that controls electric current, its action is a faint signal enlarge is worth larger telegraphic number into extent, also use as without contact switch.

Field effect is in charge of (MOS is in charge of) : One kind be field effect canal, it is a kind of semiconductor device that the electric field effect that uses control to input loop will come to control output loop electric current.

Both has the following distinction:

1, will tell from the structure, MOS canal has layer of a grid of a metal, insulation and base of a semiconductor, and dynatron has an a collector, base blasts off with extremely. MOS canal is 4 extremely parts of an apparatus, and dynatron is triode parts of an apparatus;

2, from control means is told, MOS canal brings to bear on through be between grid and base electric field will control electric current, and dynatron is blast off through be being mixed in base extremely between bring to bear on electric current will control electric current;

3, from the input resistance is told, the input resistance that MOS provides is very tall, arrive in several ohm normally between hundreds megohm, and the input resistor of dynatron is relatively inferior, arrive in thousands of ohm normally between hundred thousands of ohm;

4, from the input capacitance is told, the output electric capacity that MOS provides is lesser, arrive in law of a few skins normally between law of a few accept, and the output electric capacity of dynatron is larger, arrive in law of a few skins normally between law of hundreds of skins;

5, will tell from switch speed, MOS canal has rapidder switch rate and smaller switch loss, this makes them more common in high frequency applying. The switch rate of dynatron is slower, but the advantage is had in low frequency and power application;

6, will tell from noise, the noise level that MOS provides compares dynatron normally low;

7, tolerate from voltage degree will tell, voltage is patient degree: The voltage that MOS is in charge of is patient degree taller than dynatron;

8, will tell from dependability, dependability: MOS canal has better stability below high temperature environment, and dynatron damages easily below high temperature environment.

The dynatron that applies in power amplifier circuit and field effect canal (MOS is in charge of) because of its workmanship differs, below same production price, its attack voltage of DS pole puncture to compare dynatron generally tall, so power source of present power amplifier switch uses field effect canal to do switch to be in charge of for the most part. Still have the IGBT of parts of an apparatus with better character of a kind of switch, it linked dynatron and the good point that field effect runs, use fall in higher power and taller voltage, for instance electromagnetism furnace.

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