Ohmic Tube

Ohmic tubes and ordinary diodes (also known as diodes and silicon diodes) are two common electronic components, and there are some differences between them in terms of their structure, characteristics and applications. I will describe the differences, advantages and limitations of ohmic tubes and ordinary diodes in turn.

An ohmic tube, also known as a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), is a three-terminal controllable field-effect transistor. It usually consists of a metal-oxide-semiconductor structure and is used to amplify electrical signals or as an electronic switch.

A common diode is a semiconductor device usually composed of a PN structure (i.e., a combination of a P-type semiconductor and an N-type semiconductor). Its main function is to place a restriction on the direction of current, allowing it to flow only from the P region to the N region.

Here are the main differences between ohmic tubes and normal diodes:

1. Structure: An ohmic tube usually consists of a metal-oxide-semiconductor (MOS) structure, while an ordinary diode consists of a PN structure.

2. Wiring: Ohm tube has three pins: gate (G), drain (D) and source (S), while ordinary diodes have only two pins: anode (A) and cathode (K).

3. Control: Ohm tube conductivity can be adjusted by controlling the gate voltage, while the ordinary diode is a passive device, there is no direct control.

4. Uses: Ohm tubes are usually used as amplifiers, power switches, voltage regulators, etc., while ordinary diodes are mainly used in rectification and protection circuits.

Next we will discuss the advantages and limitations of ohmic tubes and ordinary diodes.

The advantages of ohmic tubes include:

1. high input impedance: the relatively high input impedance of ohmic tubes reduces the load on the input signal source and reduces signal distortion.

2. Low Output Impedance: The low output impedance of the ohmic tube allows it to output higher currents, thus driving high load currents.

3. High switching speed: Ohm tube has fast switching speed, which can realize high frequency electronic switching.

4. High controllability: By controlling the gate voltage, ohmic tube can realize precise control of output current.

5. High integration: Ohm tubes can be highly integrated and are suitable for the fabrication of integrated circuits.

Limitations of ohmic tubes include:

1. static power consumption: ohmic tube will have a certain amount of static power consumption during operation, resulting in energy waste.

2. High temperature sensitivity: Ohm tubes are temperature sensitive and prone to performance degradation or failure in high temperature environments.

3. Sensitivity problem: Ohm tube has high sensitivity to the input signal, too large or too small input may lead to unstable operation.

The advantages of ordinary diodes include:

1. current control: ordinary diodes can realize unidirectional control of the current, play the role of protection and rectification.

2. Mature technology: the manufacturing technology of ordinary diodes is mature and the cost is low.

3. fast switching characteristics: ordinary diodes have a fast switching speed, suitable for high-frequency electronic switching.

Limitations of ordinary diodes include:

1. passive device: ordinary diodes can not be directly controlled by external signals, but only through its own characteristics of the work.

2. Fixed characteristics: the characteristics of ordinary diodes are fixed, and cannot be regulated by the outside world, for example, it is impossible to realize the precise control of the output current.

3. Data loss: ordinary diodes will have a certain voltage drop in forward conduction, which will lead to a part of the electrical energy into thermal energy loss, resulting in energy waste.

In summary, there are some differences between ohmic tubes and ordinary diodes in terms of structure, characteristics and applications. Ohm tube has a high input impedance, low output impedance, high switching speed and controllability and other advantages, applicable to amplifiers, power switches and other fields; ordinary diodes have current control, mature technology and fast switching characteristics and other advantages, applicable to protection circuits and rectifier circuits and other fields. Of course, ohmic tubes and ordinary diodes also have some limitations, such as ohmic tube static power consumption and high temperature sensitivity, ordinary diode fixed characteristics and passive control. Considering the specific application scenarios and requirements, choosing the appropriate device can better realize the function of electronic circuits.