TM
Virtual Components for the Converging World
Amphion continues to expand its family of application-specific cores
1
See http://www.amphion.com for a current list of products
CS3820
802.11a Baseband Core
Product Brief
The CS3820 WLAN baseband core is designed to provide a high performance, low power physical layer solution
fully compatible with the IEEE802.11a standard. This application specific silicon core achieves high performance
with unique stream based architectures and can be combined with a high performance MAC and analog
components to produce a leading-edge solution.
Figure 1: Complete 802.11a Solution Using CS3820
3rd Party MAC
Amphion
CS3820
Baseband
Tx + Rx
3rd Party RF
MLME
PLME
Station
Management
FEATURES
Fully compliant with the IEEE802.11a
standard
Full support of all data rate options (up to 54
Mbps)
High performance tracking and recovery
algorithms
Low implementation loss
Innovative tracking algorithm
PAPR control
ACR filtering
Spectral shaping on TX
Performance monitoring of key parameters to
identify potential system degradation during
real world use
-
I/Q phase imbalanced measured
-
DC offset measured and corrected
-
Signal quality estimation
Low power consumption
-
Advanced clocking strategy
Minimized area
No external memory required
Complete hardware solution
-
No PHY programming required
BENEFITS
Superior error correction capability improves
range
Highly customizable for tight integration with
a variety of RF and MAC solutions
Provides efficient signal processing in a
compact and reliable solution
An excellent platform for building 802.11a
SoCs
-
Provides PHY layer functionality for 802.11e
and 802.11h
-
Combined with Amphion OCB-AES cores can
provide high strength data security 802.11i
KEY METRICS
1
Area (Logic + Memory):
340K Gates
Clock:
80 MHz
Power:
180 mW (Tx), 220 mW (Rx)
APPLICATIONS
Home wireless networking
Small business network infrastructure
Public Internet access in airports, hotels, etc.
Wireless video
1. Performance metrics are based on TSMC 180nm Standard Cell libraries.
2
CS3820
802.11a Baseband Core - Product Brief
CS3820 SYSTEM OVERVIEW
Figure 2 provides an overview diagram of the CS3820 baseband processor. Table 1 details the different modulation schemes
offered by CS3820 core.
Figure 2: CS3820 System Block Diagram
Channel Coding
Data Scrambler
Convolution Encoder
Interleaver
Mapper
Bit symbol mapper
Symbol tone mapper
Pilot insertion
Frame Assembly
IFFT
Add cyclic extension
OFDM Modulator
Add preamble
Upsampling filter
Symbol shaping
Frame sync.
Frame detection
Frequency correction
Chanel filtering
ACR filter
Channel Decoding
Signal measurement
AGC
OFDM Demodulator
Remove cyclic
extension
Coherent Detection
Channel correction
Timing correction
Demapping
Channel Decoding
De-interleaver
Viterbi decoder
Descrambler
Analog Process
DAC
RF upconverter
Analog Process
RF Downconverter
ADC
Transmit
Stream
Received
Stream
FFT
Table 1: Modulation Schemes Offered by CS3820
Modulation
Coding
Rate
Data Rate
(Mbps)
Coded Bits per
Subcarrier
Coded Bits per
OFDM Symbol
Data Bits per
OFDM Symbol
BPSK
1/2
6
1
48
24
BPSK
3/4
9
1
48
36
QPSK
1/2
12
2
96
48
QPSK
3/4
18
2
96
72
16-QAM
1/2
24
4
192
96
16-QAM
3/4
36
4
192
144
64-QAM
2/3
48
6
288
192
64-QAM
3/4
54
6
288
216
3
TM
TRANSMITTER OVERVIEW
CS3820 performs the baseband processing routines required
to transmit frames of data under the IEEE802.11a standard
and provides high performance features such as spectral
shaping and PAPR control at low power.
Figure 3: Simplified Baseband Processor Interface, Tx
Mode
RECEIVER OVERVIEW
This is the counterpart of transmit model of PHY layer
baseband processor. The CS3820 core performs the baseband
processing routines required to receive frames of data under
the IEEE802.11a standard in the presence of channel
interference and component non-linearities. The transmitter
and receiver share key blocks to reduce the overall gate count
without compromising performance.
Figure 4: Simplified Baseband Processor Interface, Rx
Mode
AVAILABILITY
ASIC CORES
For applications that require the high performance, low cost and high integration of an ASIC, Amphion delivers application
specific silicon cores that are pre-optimized to a targeted silicon technology by Amphion experts.
Consult your local Amphion representative for product specific performance information, current availability of individual
products, and lead times on ASIC core porting.
For PFGA/PLD implementation information please contact Amphion Semiconductor
CS3820
Amphion
Baseband Processor
Management
Interface
MAC
PLME
Amphion Core
DAC
RF
CS3820
Amphion
Baseband Processor
Management
Interface
MAC
PLME
Amphion Core
ADC
RF
Table 2: CS3820 ASIC Cores
PROD-
UCT ID #
SILICON
VENDOR
PRODUCT NAME/
PROCESS
CLOCK
(MHZ)
LOGIC
GATES
MEMORY
(GATES)
POWER (mW)
Transmit
Receive
CS3820TK
TSMC
180nm using Artisan
Standard Cell Libraries
80
250K
90K
180
220
CS3820
802.11a Baseband Core - Product Brief
TM
Virtual Components for the Converging World
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ABOUT AMPHION
Amphion (formerly Integrated
Silicon Systems) is the leading
supplier of speech coding, video/
image processing and channel
coding application specific silicon
cores for system-on-a-chip (SoC)
solutions in the broadband,
wireless, and mulitmedia markets
2002 Amphion Semiconductor Ltd. All rights reserved.
Amphion, the Amphion logo,"Virtual Components for the Converging World", are trademarks of Amphion Semiconductor Ltd. All others are the property of their
respective owners.
4
10/02 Publication #: PB3820 v1.0B
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