微波网络分析与综合讲座—基本知识0204.pdf

RF & Microwave
Network Design Methodology
Master’s Course Seminar
Lecturer: Wu Qun (Prof.,.)
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work synthesis
(network design procedure)
work design towards EDA
(Electronics Design Automation)
Agenda

Introduction

Overview of RF & MW
Design Process

Summary
硕士学位课系列讲座 March 2003
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Goals of the Seminar
• Introduce new
engineers to the
modern RF& MW
design process
• Document predictive
RF& MW design
process
• Focus on design
methodology, not
button pushing
• Provide practical
design tips based on
our case study
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Traditional RF & MW Design Process
Paper, pencil, calculator
Many board turns (cut and try)
Long design cycles
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Microwave applications in an
handphone set example
Base- RF Antenna
Band
Subsystem
Subsystem
(Digital) (Analog)
1/3 2/3
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RF subsystem for IS-95 CDMA/cdma 2000 1X Mobile Station
Specifications:
824MHz 849MHz 869MHz 894MHz
Tx: 25MHz T/R Isolation Rx: 25MHz
Frequency
Per RF Channel
123 ...... 64 Coding channels
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Diagram of the RF subsystem
APC
Tx AGC
Base Band Subsystem IF Amp. Up-
I/Q
Mod. AGC SAW convertor Filter PA Antenna
Clock
AFC
TCVOXO PLL Duplexer
BUS
IFA
I/Q DeMod. SAW Mixer Filter LNA
AGC
Rx AGC
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Phase-Locking Local Oscillators (PLL)
The basic configuration of a PLL
Crystal 1/R Phase Loop Filter VCO
Oscillator Detector Z(s)
Output
1/N
It consists of a high-stability crystal reference oscillator,
a VCO, a passive loop filter, and a frequency synthesizer
which includes a phase detector, a current mode charge
pump, and programmable dividers.
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Diagram of the PLL:
L oop Filter L oop Filter
LMX2332
IF Rx Lo RF Lo
VCO D RF D IF VCO
170MHz o o 855-880MHz
F in RF Fin IF
OSC LE BUS
TCXO in