WavePlexWireless Products Harris Chip solution with AMI's flexibl
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QPSK DSSS Radio using Harris PRISM Chip
WavePlexWireless Products
Harris Chip solution with AMI's flexible SX043 PRISM's ease design WavePlex's flexible codes WavePlex's flexible data rates WavePlex's data packet protocol Byte FIFOs WavePlex's simple HOST interface
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RXDI RXDQ Interface RSSI TXDI TXDQ
Harris HFA3424
RF/IF Converter
Harris HFA3624
Switch
QUAD Modulator
DSSS Baseband
SX043
Switch
Harris HFA3925
Harris HFA3724
Dual Synthesizer
Harris HFA3524
DESIGN PERFORMANCE
Band operation PRISM operating specifications output power noise figure WavePlex performance specifications processing gain Mbits/s data rates
FEATURES
Combining strength Harris PRISM design with strength WavePlex design produces stronger radio design. design does require some additional interface circuits between WavePlex component Harris PRISM components. following pages detail design interface circuits.
QPSK DSSS Radio using Harris PRISM Chip
WavePlexWireless Products
Interface Circuits
Baseband conversion signal before correlation following: Despreading Envelope detection Costas Loop
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RXDI
RXDQ
Code
Squaring Circuit
Squaring Circuit
Gain Control
RSSI
Switch inverter Switch inverter Switch Switch
DESIGN PERFORMANCE
WavePlex recovery baseband baseband
FEATURES
following pages will detail circuits required for: baseband desoreading RSSI recovery Costas Loop
QPSK DSSS Radio using Harris PRISM Chip
WavePlexWireless Products
Despreading Circuits
Baseband recovery narrow band signal following: Despreading rejection data lines
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HFA3724
Capacitor 0.1µf 2,3,6 Prime LRFMS-IL-SM6
Resistor
RXDI Pass Filter
2,3,6
Capacitor 0.1µf
Resistor
RXDQ Pass Filter
Prime LRFMS-IL-SM6
DESIGN PERFORMANCE
Receiver code with signal baseband data stream
FEATURES
Uses double balanced mixers convert wide band spread spectrum signal into data stream.
QPSK DSSS Radio using Harris PRISM Chip
WavePlexWireless Products
RSSI Circuits
Baseband recovery correlation function following: negative voltage supple required operation
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RXDI Analog Devices MLT04 RXDQ Analog Devices MLT04 W2=0.4(RXDQ)2 Resistor Resistor Resistor Resistor Vout Resistor Resistor W1=0.4(RXDI)2 Diode 1N4148
Analog Devices MLT04
RSSI Capacitor
Analog Devices OP413 R4=R1||R2||R3
Analog Devices OP413
Vout=-R3((V1/R1)+(V2/R2)) -2.5V-Vout
Capacitor 10µf
CAP+ CAP-
Analog devices ADM660 Capacitor 10µf
DESIGN PERFORMANCE
quadrant analog multipliers correlation pulse signal coupled into SX043
FEATURES
This design will require designer determine value number resistors, required design.
QPSK DSSS Radio using Harris PRISM Chip
WavePlexWireless Products
Costas Loop Circuits
Baseband recovery signal carrier frequency following: tracking data I-Q, I+Q, -(I+Q), -(I-Q)
+Vdc +Vref RXDI Resistor National LM360 +Vref RXDQ Resistor Resistor Resistor National LM360 Resistor Resistor Vout Analog Devices Resistor OP413 Resistor Vout Vout
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Resistor
+Vdc Resistor Decoder Resistor Vout Analog Devices OP413
+Vdc Resistor
Switch Switch Switch Switch
Resistor Resistor Vout Resistor Analog Devices OP413 Resistor Resistor Resistor
Resistor Vout Analog Devices OP413
Analog Devices ADG408 Constelation Point
Error
=I-Q =-(I+Q) =I+Q =-(I-Q)
DESIGN PERFORMANCE
summing devices phase error QPSK signals
FEATURES
There different Costas Loop solutions presented this note. This uses discrete op-amps resistors. other solution, shown later pages, uses more integrated approach.
QPSK DSSS Radio using Harris PRISM Chip
WavePlexWireless Products
Alternate Costas Loop Bill Material
material interface circuits which includes alternate costas loop circuit
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Component
LRFMS_1L-SM6 MLT04 OP413 ADM660 LM360 ADG408
Manufacture
Prime Analog Devices Analog Devices Analog Devices National Analog Devices
Discription
Double Balanced Mixer Channel, Quadrant Multiplier Quad Operational Amplifiers Switched-Capacitor Voltage Converter High Speed Differential Comparator Channel Analog Multiplexer
QPSK DSSS Radio using Harris PRISM Chip
WavePlexWireless Products
Alternate Costas Loop Circuits
Baseband recovery signal carrier frequency following: tracking data I-Q, I+Q, -(I+Q), -(I-Q)
page
Vout
Analog Devices AD835
RXDI
National LM360
RXDQ
National LM360 Vout
Analog Devices AD835
Constelation Point Error
=I-Q =-(I+Q) =I+Q =-(I-Q)
DESIGN PERFORMANCE
summing devices phase error QPSK signals
FEATURES
This second alternate Costas Loop circuits presented this note. This approach uses more integration components.
QPSK DSSS Radio using Harris PRISM Chip
WavePlexWireless Products
Alternate Costas Loop Bill Material
material interface circuits which includes alternate costas loop circuit
page
Component
LRFMS_1L-SM6 MLT04 OP413 ADM660 LM360 AD835
Manufacture
Prime Analog Devices Analog Devices Analog Devices National Analog Devices
Discription
Double Balanced Mixer Channel, Quadrant Multiplier Quad Operational Amplifiers Switched-Capacitor Voltage Converter High Speed Differential Comparator Multiplier
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