Transmit/Receive Switch for Quadrature Coils in a 7-Tesla...
Transcript of Transmit/Receive Switch for Quadrature Coils in a 7-Tesla...
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Transmit/Receive Switch for Quadrature Coils in a 7-Tesla Magnetic Resonance Imaging System(MRI)
Project Task for Yipeng LIU and Yan CHENG
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1.introduction
Concept of the MRI Magnetic resonance imaging (MRI),also called nuclear magnetic resonance imaging (NMRI)
MR image of the knee
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1.introduction
Theory1.Body in a large, powerful
magnet field.
2.Systematically alter the alignment of this magnetization.
3.According the Nuclear Magnetic Resonance theory,the nuclei produces a rotating magnetic field detectable by the scanner
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1.introduction
T/R switch is a circuit which allows the use of the coils in transmit also in receive.
A recent doctoral thesis has presented a design of such a T/Rswitch.
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1.introduction
To make it more clear ,we show it in the ADS Schmetic view
Transmit port
LNACoil 1
Coil 2
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2.Circuit analysis
Quadrature Hybrid Coupler
Funktion:•divider•combiner
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2.Circuit analysis
Quadrature Hybrid Coupler
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2.Circuit analysis
Bias and PIN diode
Bias PIN Diode
Transmit port
LNACoil 1
Coil 2
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2.Circuit analysis
Switch on Transmit
Transmit port
LNACoil 1
Coil 2
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2.Circuit analysis
Switch on receive
Transmit port
LNACoil 1
Coil 2
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3.Ideal circuit simulation with ADS
transmit:amplitude
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3.Ideal circuit simulation with ADS
transmit:phase
90̊
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3.Ideal circuit simulation with ADS
receive
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4.Layout & EM/Circuit Co-simulation
Condition:1.Working Frequency on 300MHz
,wave length is about 1m.The influence of TL on signal could be neglected.
2.Component size: see the table.
3.Substrate Ro4003
Component
Type Size
(mm)
Diode MA4P4006
3.81*3.81*5.08
Capacitor ATC 100B 2.79*2.79*2.59
Inductor Hand made with coils
about 10mm long
Resistor ‐ about 5 mm long
Connector ‐ 5*5
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4.Layout & EM/Circuit Co-simulation
EM/Circuit Co-simulation: Simulation in EM environment
In ADS:Layout→Simulation→optimize→Layout→Simulation
Takes several weeks
More than 10 Visions, which could be divded to 4 stages
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4.Layout & EM/Circuit Co-simulation
Stage 1
Disadvantage:1.Almost just replace wires with TL from the Schematic view,not considering the practical condition.2. Too compact ,rather not notice the the ditance between 2 TL is too close.The width of TL is too small.3.The via ground
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4.Layout & EM/Circuit Co-simulation
stage 1 simulation result
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4.Layout & EM/Circuit Co-simulation
Stage 2Disadvantage:
1.The size is little large.2.Transmit port and Receive port are close
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4.Layout & EM/Circuit Co-simulation
stage 2 simulation result
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4.Layout & EM/Circuit Co-simulation
Stage 3
Disadvantage:1.Still many paralle TL.2.not making full use of the space
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4.Layout & EM/Circuit Co-simulation
stage 3 simulation result
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4.Layout & EM/Circuit Co-simulation
Stage 4(final vision)
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4.Layout & EM/Circuit Co-simulation
Simulation result
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4.Layout & EM/Circuit Co-simulation
Give the data files(Geber) to the workshop
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4.Layout & EM/Circuit Co-simulation
Get the PCB
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5.Soldering
No experience
Before soldering , we did a soldering workshop course.
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5.Soldering
build Inductor by hand and use the inductor meter to correct the value of the inductor
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5.Soldering
hard working
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5.Soldering
PCB after soldering
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6.Testing with Network Analyzer & Tuning
Test with Network Analyzer
60MHz frequence shift
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6.Testing with Network Analyzer & Tuning
Do a EM/circuit co-simulation in ADS again.
all the inductors are smaller than what we need.
Rebuild the inductor.
Desolder the old inductors and solder the new inductors.
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6.Testing with Network Analyzer & Tuning
Finally finished PCB is following
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6.Testing with Network Analyzer & Tuning
transmit:amplitude
ideal circuit simulation test result
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6.Testing with Network Analyzer & Tuning
transmit:phase
89.0̊
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6.Testing with Network Analyzer & Tuning
receive
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Thank you very much!
Univ. Prof. Dr.-Ing. SolbachM.Sc. Saeed ArafatDipl.-Ing.Adam BuckHerr Rolf Küppers
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Thanks for your watching!
Yipeng LIU Yan CHENG