electronics’2004, sozopol, september 23 design of mixed signal circuits and systems for wireless...
TRANSCRIPT
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