Huawei EM820W manuals

Huawei EM820W User Manual (49 pages)

Brand: Huawei | Category: Portable TVs | Size: 1.34 MB |

English

Table of contents

Hardware Guide

1

Trademarks and Permissions

2

NO WARRANTY

2

About This Document

3

Contents

4

Figures

7

1 Introduction

8

2 Overall Description

9

2.3 Circuit Block Diagram

10

3.1 About This Chapter

12

PERST# NC

13

PERn0 NC

13

VCC_3V3

13

+3.3 Vaux is the only

15

3.5 USB Signals

16

3.6 USIM Signals

17

3.6.2 Design Guide

18

3.6.3 Certification Test

20

3.7 W_DISABLE# Signal

21

3.8 LED_WWAN# Signal

21

F*R+VF+IF*100 =VCC

22

F: Forward Voltage

22

F: Forward current

22

3.9 WAKE_NB_N Signal

23

3.10 NC Pins

23

4 RF Specifications

24

4.2.2 Test Standards

25

Antenna Efficiency

27

Isolation

27

S11 or VSWR

28

Polarization

28

Radiation Pattern

29

Gain and Directivity

29

4.4.2 Interference

30

4.4.4 Radio Test Environment

31

Passive Tests

31

4.5 Design Recommendations

32

5.1 About This Chapter

35

5.5 Power Supply Features

37

5.6 Reliability Features

40

5.7 EMC and ESD Features

42

6 Mechanical Specifications

43

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