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Smart Device RF & Antennas
Yong Heui Cho @ Mokwon University
2
Smart Device Structure
7. Android – Phone Calls
8. Introduction to IoT
9. Smart Device RF & Antennas
10. Introduction to RTOS
3
3G & 4G ComparisonAttribute 3G 4G
Major CharacteristicPredominantly voice- data as
add-onConverged data and VoIP
Network Architecture Wide area Cell basedHybrid – integration of Wireless LAN (WiFi), Bluetooth, Wide Area
Frequency Band 1.6 - 2.5 GHz 2 - 8 GHz
Component DesignOptimized antenna; multi-
band adaptersSmart antennas; SW multi-
band; wideband radios
Bandwidth 5 – 20 MHz 100+ MHz
Data Rate 385 kbps - 2 Mbps 20 – 100 Mbps
Access WCDMA/CDMA2000 MC-CDMA or OFDM
Forward Error CorrectionConvolution code 1/2, 1/3;
turboConcatenated Coding
Switching Circuit/Packet Packet
Mobile top Speed 200 km/h 200 km/h
IP Multiple versions All IP (IPv6.0)
Operational ~2003 ~2010
4
RF Transmitter (Tx)
)cos()cos(2
1)cos()cos( yxyxyx
BBf BBLO ff BBLO ff
• Superheterodyne
• Up-conversion: frequency
5
RF Receiver (Rx)
• Down-conversion: frequency
)cos()cos(2
1)cos()cos( yxyxyx
BBfBBIF ff BBLO ff
IFLO fff IFff
6
Simple Model for Antenna
• Antenna: I ↔ E, H
7
First Cell-phone
• Dr. Martin Cooper in Motorola
Thin phone: 7.1 [mm]
Motorola RAZR
8
Intennas for 3G Phone• Internal antenna: The antenna is in a
phone. You can’t see it.
• A metal pattern is served as an antenna.
9
Smartphone Antennas
←raymaps.com
10
Smartphone HW: AP
• Application Platform Chip
– AP: Application Processor
– Flash memory
– Mobile Dynamic RAM
– PMU: Power Management Unit
– Audio Codec
– Bluetooth
– WiFi
11
Smartphone HW: CP
• Connectivity Platform Chip
– CPU: Central Processing Unit
– DSP: Digital Signal Processing
• RF baseband processing
• Voice processing
– PA: Power Amplifier
– Tx-Rx switch
– DAC + ADC
12
Openmoko Project• Open source mobile phone project
UART: Universal Asynchronous Rx/Tx
SDIO: Secure Digital I/O
GPIO: General Purpose I/O
I2C: Inter-Integrated Circuit
13
Nexus5 Block Diagram