In the field of electronic technology, we often hear the saying that a certain component is an active device, and a certain component is a passive device!
So what components are active devices and what components are passive devices? let's get to know it today.
Some people say that active devices are components that can only work if they have a power supply, or that they require power when working. A passive device can work without a power supply, ie it does not require a power supply when it is operating.
So, is this correct?
Of course not right!
The first thing we must make clear is that as long as it is an electronic component, it is necessary to work with a power supply. How does the power supply work?
The difference between active and passive is whether you need an external power supply for normal operation, rather than whether you need power supply.
In layman's terms, active components, such as triodes, are required to display their characteristics. Passive components are called without the power supply.
The active device should work normally. In addition to the power in its own functional loop, it needs to provide normal working power, such as triode, FET, and most integrated circuits with transistors.
When the passive device is working normally, there is no need to provide additional power to it.
Passive devices operate without harmonics, producing only noise and phase shifts, passive components for signal transmission, or "signal amplification" by directionality. Capacitance, resistance, and inductance are passive devices.
Active devices are generally used for signal amplification, conversion, etc. Active devices generate various harmonics during operation, which cause output distortion. Integrated ICs, modules, etc. are active devices.
Here are some common active and passive components, and the picture has the truth!
First, common passive electronic devices
Passive devices in electronic systems can be classified into circuit-based devices and connected devices according to the circuit functions they perform.
Circuit type device
â–² diode (diode)
â–² resistor (resistor)
â–²resistor network
â–² capacitor (capacitor)
â–² Inductor
â–² transformer (transformer)
â–² Relay (relay)
â–² button (key)
â–² buzzer, speaker (speaker)
â–² switch
2. Connection device
â–² connector (connector)
â–² socket (shoket)
â–² connecting cable (line)
â–² Printed circuit board (pcb)
First, common active electronic devices
Active devices are the main components of electronic circuits. From physical structure, circuit functions and engineering parameters, active devices can be divided into discrete devices and integrated circuits.
â–²
Discrete device
Bipolar transistor
Generally referred to as triode, bjt
â–²
Field effect transistor
(field effecTIve transistor)
â–² Thyristor (thyristor), also known as thyristor
â–² Semiconductor resistors and capacitors
Resistance and capacitance fabricated using integrated technology
Used in integrated circuits.
Analog integrated circuit device
Analog integrated circuit devices are integrated circuit devices used to process analog voltage or current signals that vary continuously over time.
Basic analog integrated circuit devices generally include the following devices
â–² Integrated operational amplifier
(operaTIon amplifier), referred to as integrated op amp)
â–² comparator (comparator)
â–² logarithmic and exponential amplifier
â–² Analog multiplier/divider (mulTIplier/divider)
â–² analog switch circuit (analog switch)
â–² pll circuit (phase lock loop)
Phase-locked loop circuit
â–² integrated voltage regulator (voltage regulator)
â–² reference source (reference source)
â–² Waveform generator
â–² power amplifier
Digital integrated circuit device
â–² logic gate circuit
â–² Flip-flop
â–² register (register)
â–² decoder (decoder)
â–² data comparator (comparator)
â–² driver
â–² counter (counter)
â–² shaping circuit
â–² Programmable Logic Device (pld)
â–² microprocessor (mpu)
â–² microcontroller (mcu)
â–² dsp device
(digital signal processor, dsp)
Simple definition of passive components
If an electronic component does not have any form of power supply inside it, the device is called a passive device.
From the perspective of circuit properties, passive components have two basic characteristics:
(1) It either consumes electrical energy or converts electrical energy into other forms of other energy.
(2) Just input the signal and it will work without external power supply.
Basic definition of active devices
If an electronic component has a power supply inside it, the device is called an active device.
In terms of circuit properties, active devices have two basic features:
(1) It also consumes electricity itself.
(2) In addition to the input signal, there must be an external power supply to work properly.
It can be seen that the active device and the passive device have different working conditions and working modes for the circuit, which must be paid attention to in the learning process of electronic technology.
Graphic | old horse knows the way microcontroller
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