1

00:00:00,266 --> 00:00:03,866

In this lesson, we talk about the power amplifier power supply tube,

2

00:00:04,333 --> 00:00:06,600

which is also called power amplifier power supply chip

3

00:00:07,333 --> 00:00:12,500

The power amplifier power supply chip mainly supplies power to the RF power amplifier chip,

4

00:00:12,933 --> 00:00:18,366

and provides different voltages according to the working requirements of the power amplifier chip

5

00:00:23,300 --> 00:00:25,600

In essence, its voltage is variable

6

00:00:31,000 --> 00:00:36,766

The chip in the picture, LM3243, is a power amplifier power supply tube

7

00:00:44,266 --> 00:00:46,333

This is its input power supply

8

00:00:49,166 --> 00:00:53,400

These two PA codes represent the RF power amplifier chips

9

00:00:58,100 --> 00:01:00,833

This VOUT is its voltage output,

10

00:01:01,100 --> 00:01:04,100

which is divided into two channels to supply power

11

00:01:04,100 --> 00:01:06,833

to the two power amplifier chips respectively

12

00:01:09,100 --> 00:01:11,600

This is its simple circuit diagram

13

00:01:11,766 --> 00:01:14,200

This is the turn-on signal in the circuit,

14

00:01:15,600 --> 00:01:18,700

this is the mode control, this is the feedback,

15

00:01:19,166 --> 00:01:20,566

these are the ground pins

16

00:01:22,066 --> 00:01:27,733

The power supply tube of the power amplifier is generally located around the power amplifier chip

17

00:01:28,233 --> 00:01:29,733

For example, in the picture,

18

00:01:30,233 --> 00:01:32,233

this is the power amplifier chip,

19

00:01:32,433 --> 00:01:35,466

and this frame is the power amplifier power supply tube

20

00:01:35,666 --> 00:01:39,000

There are large inductors and capacitors on the edge of this chip

21

00:01:39,400 --> 00:01:41,700

What we need to pay attention to is that

22

00:01:41,700 --> 00:01:44,500

the power amplifier chips of the MediaTek platform

23

00:01:44,500 --> 00:01:46,500

are powered by the main power supply,

24

00:01:47,000 --> 00:01:49,433

there is no power amplifier power supply chip,

25

00:01:49,633 --> 00:01:53,666

and other platforms have separate power amplifier power supply chips

26

00:01:54,933 --> 00:01:57,866

For example, the power amplifier power supply chip here

27

00:01:57,933 --> 00:02:01,100

has large inductor and large capacitor on its side

28

00:02:01,333 --> 00:02:05,566

This is a power amplifier power supply chip with a large inductor on the side

29

00:02:05,966 --> 00:02:08,966

The power supply code of the power amplifier is generally

30

00:02:08,966 --> 00:02:13,466

located in the circuit where the radio frequency components are located

31

00:02:17,300 --> 00:02:19,333

Okay, that's all for this lesson