josep maria margarit taulédesign & analysis of a 2.4-ghz cmos qvco using amss35d4 design &...
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Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Design & analysis of a 2.4 GHz Design & analysis of a 2.4 GHz CMOS Quadrature VCO using CMOS Quadrature VCO using
AMSS35D4 technologyAMSS35D4 technology
RFSoC – Final ProjectRFSoC – Final ProjectMaster in Electronics EngineeringMaster in Electronics Engineering
Josep Maria Margarit Taulé
Advisor: Xavier Aragonès Cervera
Escola Tècnica Superior d’Enginyeria de Telecomunicació de Barcelona
UNIVERSITAT POLITÈCNICA DE CATALUNYA
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
11 IntroductionIntroduction
22 Design procedureDesign procedure
33 ResultsResults
44 ConclusionConclusion
Introduction Design procedure Results Conclusion
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
11 IntroductionIntroduction
22 Design procedure Design procedure
33 Results Results
44 ConclusionConclusion
Introduction Design procedure Results Conclusion
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
IntroductionIntroduction
Complete design procedure of a 2.4 GHz LC CMOS quadrature VCO.
Process technology: AMSS35D4 (SiGe 0.35 m, 4-metal, thick metal available).
Tasks:
Initial rough calculations Accurate cadence rf-modelled simulation and tuning Result analysis and conclusions
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
11 Introduction Introduction
22 Design procedureDesign procedure
33 Results Results
44 ConclusionConclusion
Introduction Design procedure Results Conclusion
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
SpecsSpecs
Spec Units Value
Vdd V 3.3
Power consumption mW <25
Output load k,pF
f0 GHz 2.4
Tuning range MHz 100
Harmonic distortion dBc <-40
S.E. output amp. V 1 Vpp ± 15%
Phase noise dBc <-100
Phase error º <1
1kΩ 0.4pF
Specs Calculations Single VCO QVCO
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Handy calculationsHandy calculations
First order, simplified expressions from subject topics
Automatic calculation procedure
Specs Calculations Single VCO QVCO
Excel worksheet
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Single VCO (L selection)Single VCO (L selection)
Thick metal (higher Q)
Large L/Q desired: less power consumption
TOTL 2.42nH 2 4.84nH
SL
W L 2 2.4e9 4.84e 9R 7.848
Q 9.6
2PL SR R 1 Q 686.613
Specs Calculations Single VCO QVCO
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Single VCO (varactor selection)Single VCO (varactor selection)
Minimum varactors
Higher QT
TOT 20
var
1C 908.6fF
W L
C8.33%
CC 8.33e 2 908.6fF 75.69fF C
Specs Calculations Single VCO QVCO
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Single VCO (ISingle VCO (Itail tail calculation)calculation)
Losses estimation:
Itail must be:
Specs Calculations Single VCO QVCO
Ptotal load Pinductor PveqR R R R
ptotaltotal
0
RQ
Z
tan k tan ktail
ptotal total 0
2V 2VI
R Q Z
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Single VCO (nmos W-L choice)Single VCO (nmos W-L choice)
From previous Itail calculation (b=2):
But... Transistor losses!
Specs Calculations Single VCO QVCO
m biasptotal
4 Wg 2K ' I
R L
ptotal load Pinductor Pveq PequivnmosR R R R R
L=1 µm
Further considerations:
Adjustments Iterative tran simulations
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Single VCOSingle VCO
Itail =7 mA
gm=13 mS
W=75 µm
L=1 µm
Specs Calculations Single VCO QVCO
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion Specs Calculations Single VCO QVCO
QVCOQVCO
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion Specs Calculations Single VCO QVCO
QVCO (coupling definition)QVCO (coupling definition)
Coupling factor:
couplingnmos
switchingnmos
W
W
Trade-off:
α Phase noise , but phase error !! α =1/3
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion Specs Calculations Single VCO QVCO
QVCO (center frequency tuning)QVCO (center frequency tuning)
Pss simulations
From an initial frequency (f0i):
Cpoly resizing
parasitics var poly20i
1C C C
L W
~350 fF
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
11 Introduction Introduction
22 Design procedure Design procedure
33 ResultsResults
44 ConclusionConclusion
Introduction Design procedure Results Conclusion
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Results (I-Q transient analysis)Results (I-Q transient analysis)
Vtank ~ 900 mV
Tinit ~ 1.5 µs
I-Q tran F/V Harm./Ph. noise Ph. error Summary
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Results (f/V pss analysis)Results (f/V pss analysis)
ftun ~ 2.35-2.45 GHz
KVCO ~ 268 MHz/V
I-Q tran F/V Harm./Ph. noise Ph. error Summary
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Results (harmonic/phase noise analysis)Results (harmonic/phase noise analysis)
Max. Harm. level ~ -43.3 dBc
Phase noise (600 kHz) ~ -118 dBc
I-Q tran F/V Harm./Ph. noise Ph. error Summary
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Results (phase error)Results (phase error)
Phase error:
phase
1.09p360 0.942º
1
2.4e9
I-Q tran F/V Harm./Ph. noise Ph. error Summary
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
Results (summary)Results (summary)
QVCO final parameters
QVCO final results
I-Q tran F/V Harm./Ph. noise Ph. error Summary
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
11 Introduction Introduction
22 Design procedure Design procedure
33 Results Results
44 ConclusionConclusion
Introduction Design procedure Results Conclusion
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Introduction Design procedure Results Conclusion
ConclusionConclusion
Complete design procedure of a 2.4 GHz LC CMOS quadrature VCO (SiGe 0.35 m, 4-metal, thick metal tech process)
Tech. main drawback: low QL Itail
Design key points:
L selection (highest L-Q at main frequency)
But... Ctotal>Cparasitics!!
gds to be considered!
Coupling factor trade-off (Phase noise vs. Phase error)
Josep Maria Margarit Taulé Design & analysis of a 2.4-GHz CMOS QVCO using AMSS35D4
Design & analysis of a 2.4 GHz Design & analysis of a 2.4 GHz CMOS Quadrature VCO using CMOS Quadrature VCO using
AMSS35D4 technologyAMSS35D4 technology
RFSoC – Final ProjectRFSoC – Final ProjectMaster in Electronics EngineeringMaster in Electronics Engineering
Josep Maria Margarit Taulé
Advisor: Xavier Aragonès Cervera
Escola Tècnica Superior d’Enginyeria de Telecomunicació de Barcelona
UNIVERSITAT POLITÈCNICA DE CATALUNYA