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![Page 1: Presentation - Advanced VCO Design using Ansoft Designereducypedia.karadimov.info/library/Advanced_VCO... · Agenda w About Ansoft Designer w VCO specification w Device library making](https://reader034.fdocuments.us/reader034/viewer/2022052313/5aa1d1687f8b9ada698c1c68/html5/thumbnails/1.jpg)
Advanced VCO Designusing Ansoft Designer
Moriaki UenoAnsoft Japan
Presentation #8
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Agenda
w About Ansoft Designerw VCO specificationw Device library makingw Resonant Circuit designw Oscillator Circuit designw Buffer amp designw Total analysisw Conclusion
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About Ansoft Designer
System Simulation
Communication
Circuit Simulation
High FrequencyElectro Magnetic
Simulation
Planar EM
Integrated environment
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VCO specifications
w We intend to design VCO for mobile communications.w Oscillation frequency 1800MHz +/- 30MHzw Output power more than 4dBmw Supply voltage 3Vw Current consumption 8mA
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VCO circuitw Circuit topology and power estimation
Output port
Vcc
Freq. control
Oscillator Buffer Amp
Resonant CircuitS21 ; 9dB @2GHz Ic=3mAPower level ; -3dBm
Power level ; 6dBm
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VCO Circuit
w Parts to usew Transistor 2SC5668(NE667M03) OSC
2SC5435(NE685M03) Bufferw Varicap JDV2S13Sw Condenser GRP15, GRP18 seriesw Coil LQW18 seriesw Substrate TMM-4 t=0.8mm double sided
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Device library making
w Equivalent circuit for condenser and coil*
* Parallel resistor added for improve DC current convergencein Harmonic balance analysis
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Device library making
w Equivalent circuit for packaged transistor and diode
chip
package
package
chip
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Device library makingw Write net list and importing library to user-library
Write net list and copy to user-library
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Resonant Circuit
w Microstrip resonator
Practical resonant circuit Evaluate resonant circuit
small condenser added
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Evaluate resonator circuit response
Evaluate resonant circuit
tuning voltage = 2.5V1V 4V
Frequency range
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Relation between unloaded Q (Qu) and Frequency range
w Qu and Frequency range change according to microstrip width.
w As Qu increase, frequency range is decrease.
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Determine microstrip width
w “Qu*Frequency range” is introduced as a indicator to evaluate resonant circuit performance
It shows 1.0mm is best
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Insert physical layout
w It can make layout by inserting EnsembleCircuit.
Revised circuit
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Simulation with physical layout
w Make microstrip layout and simulate resonant circuit under co-simulation
Pattern layout Parts layout
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Simulator setting
Include 0Hz
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Resonant circuit simulation result
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DC bias calculation
0.65V
1.5V
0.85V
330 ohm
Ic is set 2.6mA
3.3 kohm
3.3 kohm
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Oscillator circuit
Parts layout
Pattern layoutOscillator circuit
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Simulation result
w After adjust resonant circuit
Output Level Oscillation frequency
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Buffer amp design
w DC bias
330 ohm3.3 kohm
3.3 kohm
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Impedance matchingw Adjusted circuit
TG21
S11&
S22
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Simulation result with physical layout
Pattern layout S11 & S22
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Revised circuit
Pattern layoutFinal circuit
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Buffer amp performance
S11
TG21
S11 & S22
S21
S12
S22
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Total simulation
w Final step of VCO designw Merge oscillator and buffer amp layout.w Make schematic which include EnsembleCircuit’s symbolw Adjust oscillation frequencyw Adjust other performances.
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Merged layout and schematic
Merged layout VCO schematic
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Adjusted layout
Condenser move
Microstrip length shortened
Resonant microstriplength shortened
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Final result
w Oscillation frequency and output power
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Final result
w Output spectrum and load-pull characteristics
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Final result
w Output voltage and power waveform
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Conclusion
w VCO design is showed step by stepw Ansoft DesignerTM is powerful tool
w Seamless environment between circuit and electro magnetic simulator makes short time design.