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.

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Smartphone Antennas

←raymaps.com

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Smartphone HW: AP

• Application Platform Chip

– AP: Application Processor

– Flash memory

– Mobile Dynamic RAM

– PMU: Power Management Unit

– Audio Codec

– Bluetooth

– WiFi

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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

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Nexus5 Block Diagram