Digital Power Amplifier

Introduction

A digital power amplifier is an electronic amplifier designed to increase the power amplitude of a given input signal. The power of the input signal increases to a load level sufficient to drive output devices such as speakers, headphones, RF transmitters, etc. Unlike voltage/current amplifiers, power amplifiers are designed to drive loads directly and eventually the module is in the amplifier chain.

The input signal of the power amplifier mini needs to be above a certain threshold. Therefore, instead of passing the original audio/RF signal directly to the power amplifier, it is first pre-amplified using a current/voltage amplifier and sent as input to the power amplifier after making the necessary modifications.

Basic composition

The digital power amplifier usually consists of 3 parts: a preamplifier, a driver amplifier, and a final stage power amplifier.

1. The preamplifier plays a matching role, its input impedance is high (not less than 10kΩ), most of the previous signal can be absorbed, and the output impedance is low (tens of Ω below), and most of the signal can be transmitted. At the same time, it is itself a current amplifier that converts the input voltage signal into a current signal and gives appropriate amplification.

2. The driving amplifier plays the role of a bridge, it further amplifies the current signal sent by the preamplifier, and amplifies it into a medium power signal to drive the final stage power amplifier to work normally. Without a driver amplifier, the final stage power amplifier cannot send a high-power sound signal.

3. The final stage power amplifier plays a key role. It will drive the current signal sent by the amplifier to form a high-power signal, drive the speaker to sound, and its technical specifications determine the technical specifications of the entire power amplifier.

Working principle

The current control function of triode or the voltage control function of FET is used to convert the power of the power supply into the current varying according to the input signal. Because sound is a wave with different amplitudes and frequencies, that is, AC signal current, the collector current of the triode is always the base current in the amplification area β Times, β Is the current amplification factor of the triode. If a small signal is injected into the base, the current flowing through the collector will be equal to the base current β And then isolate the signal with a DC isolating capacitor to obtain that the current (or voltage) is the original β This phenomenon becomes the amplification effect of the triode. After constant current amplification, power amplification is completed.

Function

Digital power amplifier (PA) refers to an amplifier that can generate the maximum power output to drive a load (such as a loudspeaker) under a given distortion rate. The power amplifier plays a pivotal role of "organization and coordination" in the whole sound system, and to some extent, it determines whether the whole system can provide good sound quality output.

Application

The following are the applications of power ampli in different fields:

Consumer electronics: Audio power amplifiers are used in virtually all consumer electronic devices, from microwave ovens, headphone drivers, TVs, mobile phones, and home theater systems to theater and concert PA systems.

Industrial: Switching power amplifiers are used to control most industrial actuator systems such as servos and DC motors.

Wireless communication: High power amplifiers are important in transmitting cellular or FM broadcast signals to users. Higher power levels are possible because power amplifiers increase data transmission rates and availability. They are also used in satellite communication equipment.

Certificate

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Shipping

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Packaging

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