文档介绍：Low-Noise Amplifier (LNA)
Design
RF & work Design Basics
——Master’s Course Seminar
Lecturer: Wu Qun (Prof.,.)
Agenda
z Introduction
z Overview of RF & MW Design Process
z Case Study: RF Front-End
− Low-Noise Amplifier (LNA)
z Measurement for Design
− Active Device Parameter Extraction
z Summary
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Design Cycle Case Study: LNA
Concept
L
NA
D
es
Design ign
Integration
Design
Simulate Modify design
(Circuit & System) to match proto
Good
Build physical
proto & test
Good
Integrate
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Concept: System-Level Design
(Simple PCS-band transceiver front end)
Freq. = 1880 MHz +/- 50 MHz min.
Pout (1 dB) = +25 dBm min
Psat = +27 dBm min
Gain = + 24 dB min
Power Amp
Duplexer
Freq. lower band = 1880 MHz +/- 30 MHz
Freq. upper band = 1960 MHz +/- 30 MHz
LNA
Freq. = 1960 MHz +/- 50 MHz min
Gain = + 25 dB min TheThe first first part part of of the the case case study study
NF < dB willwill focus focus on on the the LNA LNA
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What Are My Resources?
How do I design a low-noise
amplifier?
z Talk with experienced people
z Textbooks
z Magazines (., RF & MW
Design)
z Classes
z Purchase from third-party
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Choosing a Device
A typical low-noise device
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Amplifier Stage Design
G1 ,NF1 G2 ,NF2 G3 ,NF3 Gtotal , NFtotal
Output
Input Active
Matching
Matching Device
Network
Network
Biasing
Network
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Transistor Biasing
z Decide on bias currents and voltages
z Find values for biasing resistors
z Verify values using DC analysis with the nonlinear model
z Design from available power supplies
z Check power dissipation
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Input work
Gain Circles:
Noise Circles:
Max. Gain:
dB
Min. Noise: dB
- dB
+ dB
- dB
+ dB
Notice that the match for maximum gain i