How do active components differ from passive ones?

In RF systems, active and passive devices are often used, so what are active devices, what are passive devices, and what are the differences between them?

(i) Definition:

An active component must be operated with a power supply inside it.

A passive component is operating without any form of power inside it.

Frankly, those devices that require an energy (electric) source are called as active, and devices that do not require an energy (electric) source are passive.

(ii) Basic features:

Active devices: consume power, in addition to the input signal, must have an additional power supply in order to work properly.

Passive devices: consume electricity on its own, or convert it into different forms of other energy. Simply input the signal and it does not require any additional power supply to function properly.

(iii) 5G applications

Active and passive devices are also widely used in today's 5G applications, such as:

Active devices: RF amplifiers, RF switches, RF phase shifters and phase spinners, RF limiters and detectors, RF programmable attenuators, RF noise sources, RF oscillators

Passive devices: power dividers, diplexers, duplexers, fixed attenuators, terminals/loads, filters, directional couplers, tappers, waveguides, circulator, isolator, etc.

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Post time: Sep-03-2021