Image compression based on energy clustering and zero-quadtree representation

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POWER OPTIMIZED LCVCO MIXER
CO-DESIGN Daniel Götz, Milosz Sroka June
20th, 2006
MSICT RF Communication SoC
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PAPERS IMPLEMENTATION
OUR IMPLEMENTATION
RESULTS
CONCLUSION
INTRODUCTION

• Power Optimized LC VCO Mixer Co-design
• by Byunghoo Jung, Shubha Bommalingaiahnapallya,
  and Ramesh Harjani University of Minnesota, Dept.
  of ECE
• Capacitively source degenerated buffer used as
  a negative resistance cell
• No need of cross-coupled scheme
• Reduced power consumption
• Mixer input capacitance incorporated into the
  degeneration capacitor

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INTRO
OUR IMPLEMENTATION
RESULTS
CONCLUSION
PAPERS IMPLEMENTATION

• General implementation steps (1)
• LC Tank-based VCO Design

Parallel LC oscillator model
Requirements of negative resistance
Parallel LC oscillator model
Requirements of negative resistance
Buffer sizing and parameters calculation
Buffer sizing and parameters calculation
Tank design for oscillation frequency
Design of the VCO complete structure
Tank design for oscillation frequency
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INTRO
OUR IMPLEMENTATION
RESULTS
CONCLUSION
PAPERS IMPLEMENTATION

• General implementation steps (2)
• Mixer Design
• ? Standard Gilbert cell design
• ? Reduced noise figure, maximized conversion
  gain
• ? Input impedance characteristics
• VCO-Mixer Co-Design
• ? Incorporation of the mixer input impedance to
  the VCO structure.
• ? Other linkage effects

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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION

• Step 1/6 Tank design
• Estimation of the oscillation frequency ? L, C
• ?
• Calculation of the parasitic resistance of L
• ? Graphically
• ? Approximation
• Required negative resistancefor compensation ?
  Req

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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION

• Step 2/6 Degenerated Negative Resistance Cell
• Dimensioning of the degenerating cell ? Cs,
  width, Ibias, VDD

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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION

• Step 3/6 Tank Re-design
• Calculation of the Ceq of the cell
• Re-design

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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION

• Step 4/6 Oscillation structure
• Tank biasing
• Pulse generation

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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION

• Step 5/6 Mixer design
• Standard Gilbert cell
• ? Transistor dimensioning
• ? R load
• ? I bias
• Input impedance
• ? R in series with C

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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION
Step 5/6 Mixer design
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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION

• Step 6/6 Co-design
• Linkage
• ? Mixer input impedance
• ? Tank tuning (not necessary)
• ? Linkage capacitance to eliminate DC offset

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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION

• Step 6/6 Co-design

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INTRO
PAPERS IMPLEMENTATION
RESULTS
CONCLUSION
OUR IMPLEMENTATION

• Step 6/6 Co-design

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INTRO
PAPERS IMPLEMENTATION
OUR IMPLEMENTATION
CONCLUSION
RESULTS
VCO Transient analysis Single
ended Differential output
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INTRO
PAPERS IMPLEMENTATION
OUR IMPLEMENTATION
CONCLUSION
RESULTS
PSS and Pnoise analysis
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INTRO
PAPERS IMPLEMENTATION
OUR IMPLEMENTATION
RESULTS
CONCLUSION

• Comparison between paper and our implementation
• Low power design could not be achieved because
  of,
• Different Technology (paper 0.18µm, used
  0.35µm)
• Not sufficient good inductors (Q, parasitic
  resistance)
• comparable PSS results
• Phase noise was realized not that good as in the
  paper. At 1GHz paper -107dBc/Hz our
  implementation -52dBc/Hz
• Discovered Bottleneck of this design
• Inductors because provide mainly the parasitic
  resistance which should be compensated with the
  Buffer-Transistors.