Are consumer electronics RF engineers passive or active?

1. Simple definition of passive devices

If an electronic component works without any form of power supply inside, it is called a passive device.

From the circuit nature, passive devices have two basic characteristics:

(1) It either consumes electric energy or converts it into other energy in different forms.

(2) It can work normally only by inputting signals and without external power supply.

2. Basic definition of active devices

If an electronic component has an internal power supply when working, it is called an active device.

As far as circuit characteristics are concerned, active devices have two basic characteristics:

(1) itself consumes electricity.

(2) In addition to the input signal, there must be an external power supply to work normally.

It can be seen that active devices and passive devices have completely different requirements for the working conditions and working modes of circuits, which must be paid great attention to in the learning process of electronic technology.

First, common passive electronic equipment.

Passive devices in electronic systems can be divided into circuit devices and connecting devices according to their circuit functions.

1. Circuit equipment

(1) diode

(2) resistor

(3) Resistance network

(4) Capacitor

(5) sensor

(6) Transformer

(7) relay

(8) keys

(9) Buzzer and speaker

(10) switch

2. Connected devices

(1) connector

(2) shoket

(3) Connecting cables (wires)

(4) Printed circuit board

Second, common active electronic devices

Active devices are the main devices in electronic circuits. From the physical structure, circuit function and engineering parameters, active devices can be divided into two categories: discrete devices and integrated circuits.

1. discrete device

(1) bipolar transistor, usually called triode, BJT.

(2) field effect transistor.

(3) Thyristors, also called silicon controlled rectifiers.

(4) Semiconductor resistors and capacitors-resistors and capacitors manufactured by integrated processes in integrated circuits.

2. Analog integrated circuit devices

Analog integrated circuit devices are integrated circuit devices used to process analog voltage or current signals that change continuously with time.

Basic analog integrated circuit devices usually include:

(1) integrated operational amplifier.

(2) Comparator

(3) Logarithmic and exponential amplifier

(4) Analog Multiplier/Divider

(5) Analog switch circuit

(6)PLL circuit, that is, phaselockloop circuit.

(7) Integrated voltage regulator

(8) Reference sources

(9) Waveform generator

(10) power amplifier

3. Digital integrated circuit devices

(1) logic gate circuit

(2) Trigger

(3) Registration

(4) Decoder

(5) Data comparator

6. Drivers

(7) Counter

(8) shaping circuit

(9) Programmable logic devices

(10) microprocessor

(1 1) microcontroller

(12) digital signal processor