Attenuator principle

I. Principle of attenuator -- Introduction

attenuator, the English name attenuator, is widely used in various electronic equipment, the official definition of attenuator is "in the specified frequency range, a circuit used to introduce a predetermined attenuation", generally marked by the number of decibels introduced to attenuate and the number of ohms of its characteristic impedance. The attenuator can be mainly divided into passive attenuator and active attenuator, of which the passive attenuator can be divided into fixed attenuator and adjustable attenuator, and the active attenuator is generally used with the thermal element to form a variable attenuator.

Second, the principle of attenuator - composition

The attenuator is mainly composed of resistive materials, and the resistance we are most familiar with is actually a basic form of the attenuator, and the complex form of the attenuator is only the resistance attenuator network formed from this. The attenuator we commonly use is generally to attenuate the signal in a certain frequency range, how is this done? This resistive material can be placed in the RF or microwave circuit structure of the corresponding frequency band by a special process.

Third, the attenuator principle

Attenuator, an energy-wasting RF/microwave component that provides attenuation, but in addition to the function of adjusting the signal size, can also be directly used for reading the attenuation value of the network under test in a comparative measurement circuit, and can also improve impedance matching to buffer the impedance effect. In general, attenuators are often used in cable TV to meet the level requirements of multiple ports (such as: amplifier input, output, etc.).

 

1. Principle of attenuator

 

2. Principle and design of attenuator