EMI共模电感及基础知识-ICT

• Common mode filter/Common mode ESD filter(Serial data line)
Mobile phone(Smart phone) – differential data line(MDDI, MIPI, USB2.0, HDMI/MHL) Radiation noise(antenna sensitivity, regulations), signal integrity(jitter, eye diagram) Set-top box, Digital TV, Navigation, MP3 player and so on available for all differential signaling data lines
Radiation
Radiation
WeakLeabharlann Baiduground
Capacitive coupling Noise to other circuits or power
Innochips Technology
EMI in serial interface – CM noise simulation
Innochips Technology
Applications in mobile phone
Galaxy Note(5.3’’)
Main PCB 背面
ICMEF112P900M → 背面 Camera 3point
Innochips Technology
Applications in mobile phone
ICMF112P900M ICMF112P900M ICMF214P101M ICMF112P900M ICMF214P101M ICMF112P900M ICMF214P101M ICMF112P120M ICMF112P350M
ESD
IECS0505C050 IECF1605C060 IECF2105C060 IECF1605C060 IECF2105C060 IECF1605C060 IECF2105C060 IECF1605C060 IECF2105C060
Innochips Technology
Common mode filter/Common mode ESD filter
·Common mode filter, ICMF series - Countermeasure of common mode noise - Appropriate for high speed data lines
D+ Common mode voltage ≠ 0 V D-
ex) In FR4 (εr = 4.6) PCB, Difference in length Time difference (skew) Rising time in various applications
1mm
5mm 10mm
7.15 ps
35.75 ps 71.48 ps
· HDMI: 75 ps · MIPI: 150 ps · USB: 400 ps And becoming shorter and shorter
· Electromagnetic field of common / differential mode signals
·Common mode ESD filter, ICMEF series - countermeasure of EMI+ESD problems - CMF + TVS components → one package → cost down & better feasibility - Especially suitable for moblie phones
(78.5mm)
(75mm) (measured data)
Innochips Technology
EMI in serial interface – CM noise simulation results
Innochips Technology
Applications in mobile phone
· Currently used high speed serial interface - MDDI (LCD, up to 400 Mb/s) - MIPI (LCD/Camera module, up to 1 Gb/s) - USB 2.0 (480 Mb/s) - HDMI (1.49 Gb/s for 1080p) - MHL (2.25 Gb/s for 1080i) · Expected future technologies - MIPI M-PHY (Min. 1 Gb/s) - USB 3.0 (5 Gb/s) - Thunderbolt (10 Gb/s) Camera Module
MIPI
· ICMEF112P900 · ICMEF214P101 · TVS diodes (rare)
USB2.0
· ICMEF112P900 · TVS diodes
HDMI
· D-type connector · 1080p resolution available · Very high data rate in mobile phone EMI issue in EMC test Compliance test issue (eye diagram) · Connection with TV through micro USB connector (Micro USB connector covers MHL, charger, and USB) · Common mode is used for clock (not general) · Additional decoder (MHL to HDMI) is required. · Highest data rate in mobile phone (2.25 Gb/s) EMI issue in EMC test Compliance test issue Not easy to meet the specifications and test limits
• ESD filter(parallel data line)
Mobile phone – parallel data line/camera data line/key pad Antenna sensitivity, ESD protection
Computer data line & peripherals Radiation noise(regulations), ESD protection Laptop computer – Radiation noise(regulations, wireless LAN), ESD protection Navigation Radiation noise(regulations, GPS), ESD protection and other electronics appliances with LCD or digital camera module
Sub CAM
Galaxy S-2
Main CAM
LCD
MHL
Innochips Technology
Applications in mobile phone
LG Optimus 2X
HDMI
Main CAM
USB
Innochips Technology
Applications in mobile phone
EMI in serial interface
Common mode noise
- Ideal case only differential mode signal, no in-phase signal between D+ and DD+
D-
- In real, common mode signal occurs because of the difference of electrical length between D+ and D- signal lines.
LG Optimus Big
LCD
HDMI USB Main CAM
Innochips Technology
Applications in mobile phone
Application · Mostly used in smart phone - LCD (6 ~ 10 lines) - Main camera (6 lines) - VT camera (4 ~ 6 lines) · Data rate: 400 ~ 800 Mb/s LCD, camera issue: black screen, abnormal pattern and color, screen halt and so on · Mostly high speed · micro USB (PC connection & battery charger) EOS issue in fabrication and field EMI issue in EMC test Compliance test issue (eye diagram) EMI/ESD components
Innochips Technology
EMI/ESD protection device for serial data lines
Common mode filter / Common mode ESD filter
Innochips Technology
EMI/ESD filters for data lines
MIPI: ICMF/ICMEF series (90, 100 Ω)
PCD/W-CDMA/CDMA 1X etc. GSM
RF
Main LCD Sub LCD
Communication Processor
Display Controller
MDDI/MIPI: ICMF/ICMEF series (90, 100 Ω)
Innochips Technology
Applications in mobile phone
Galaxy Note(5.3’’)
Main PCB正面
ICMEF112P900M → LCD 5point
ICMEF112P900M → 正面 Camera 2point
ICMEF112P500M → MHL 1point
MDDI
· ICMEF214P101 · ICMEF112P900 · TVS diodes (rare)
Innochips Technology
Recommended components in mobile applications
EMI USB 2.0 HDMI MIPI MDDI MHL
Application Processor
Memory Card USB 2.0 / 3.0
USB 2.0: ICMF/ICMEF series (90 Ω)
USB 3.0: ICMF/ICMEF series (12, 35 Ω)
HDMI
HDMI: ICMF/ICMEF series
MHL
MHL: ICMF/ICMEF series (12, 35, 50 Ω)
EMI+ESD
ICMEF112P900M ICMEF112P900M ICMEF214P101M ICMEF112P900M ICMEF214P101M ICMEF112P900M ICMEF214P101M ICMEF112P120M ICMEF112P350M
Innochips Technology
· LCD display standard · Adopted in a few models in LGE and Pantech (not Samsung)
· ICMEF112P900 · ICMEF214P101 · TVS diodes (rare)
MHL
· ICMEF112P350 · TVS diodes