Introduction Microelectronics in Mobile Communications

Electronics’2004, Sozopol, September 23

Design of Mixed Signal Circuits and Systems for Wireless Applications

V. LANTSOV, Vladimir State [email protected]

• Introduction• Microelectronics in Mobile Communications• CAD tools, mixed signal methods of analysis• Wireless Design Methodologies• Conclusions

Design of Mixed Signal Circuits and Systems for Wireless Applications

Introduction

• Expansion of the market for portable wireless communication devices

• Time-to-market, low-power, CAD tools• Design methodologies• Integration on a single chip (system on a

chip)

Design of Mixed Signal Circuits and Systems for Wireless Applications

Microelectronics in Mobile Communications

Design of Mixed Signal Circuits and Systems for Wireless Applications

Microelectronics in Mobile Communications

Design of Mixed Signal Circuits and Systems for Wireless Applications

Microelectronics in Mobile Communications

• Radio section (present time)– Direct conversion or low IF– Up and converters circuits – in a single chip– LF functions – in two chips and separate

synthesizer or single CMOS device– Power supply – 3 V

Design of Mixed Signal Circuits and Systems for Wireless Applications

Microelectronics in Mobile Communications

• Radio section (3G terminals)– Multimode and multiband operation– Wideband architectures– Programmable trackable filters– One chip implementation– Active control on power amplifier

Design of Mixed Signal Circuits and Systems for Wireless Applications

Microelectronics in Mobile Communications

• Digital section (present time)– Single CMOS ASIC plus two standard ICs– ICs – SRAM and Flash memory– ASIC – speech coding and decoding,

synchronization, demodulation and etc.

Design of Mixed Signal Circuits and Systems for Wireless Applications

Microelectronics in Mobile Communications

• Digital section (3G terminals)– High bit rate– complexity of processing– Base-band Chip – DSP

Design of Mixed Signal Circuits and Systems for Wireless Applications

CAD tools, mixed signal and RF methods of analysis

• System level special design tools (for example, AdvanceMS from Mentor)

• SPICE-like simulators for circuit level and mixed signal and RF designers

• Special CAD tools (ADS, SpectreRF, EldoRF, Microwave Office, PSP)

• Special numerical methods or platform methods: Shooting, Harmonic balance, Volterra series

Design of Mixed Signal Circuits and Systems for Wireless Applications

Wireless Design Methodologies

• A lot of standards for personal communications

• Absence a good CAD tools

• Difficulties of using CAD tools

• Difficulties of transfer of specifications from system level to circuit level and implementations

• Absence of a good design methodologies

Design of Mixed Signal Circuits and Systems for Wireless Applications

Wireless Design Methodologies

• Software-Defined Radio (SDR) technique– advances in A/D and D/A conversions (conversion of the

signals close to the antenna)

– growth in using of the DSP and FPGA devices (re-configurable hardware)

• Different frequency bands, different standards, different algorithms of demodulation and digital signal processing can be implemented by loading software into one hardware

Design of Mixed Signal Circuits and Systems for Wireless Applications

Wireless Design Methodologies (Examples)

RF

front-end

Channel

demodulation

Channel decoding

Voice decoding or/and

high level protocol unpack

Forward channel decoder structure

Design of Mixed Signal Circuits and Systems for Wireless Applications

Wireless Design Methodologies (Examples)

Reconfigurable decoder space

Input buffer of

paging channel frame

Reconfigurable channel decoder

Output buffer of

paging channel frame

Control unit for

loading channel decoder

Input buffer of

traffic channel frame

Output buffer of

traffic channel frame

Cofiguration stream storage

Reconfigurable channel decoder architecture

Design of Mixed Signal Circuits and Systems for Wireless Applications

Wireless Design Methodologies (Examples)

Analogue anti-aliasing filtering and sample

conversion for GSM 1800

Analogue anti-aliasing filtering and sample

conversion for CDMA

Analogue anti-aliasing filtering and sample

conversion for IMT-2000

… Sele

ct b

y di

gita

l con

trol

Software-defined digital

signal processing

Reconfiguring and select control

Top-layer applications

Analogue anti-aliasing filtering and sample

conversion for DAMPS

Receiver with selectable analog blocks architecture

Thank you