Fully Integrated Differential Distributed VCO using Ansoft IC Solution

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Fully Integrated Differential Distributed VCO • Tuning: Delay variation by positive feedback • Oscillation frequency curve has a linear region • Constant output power © 2008 Ansoft, LLC All rights reserved. Ansoft, LLC Proprietary Analogies Proprietary & Confidential
DDVCO Design Considerations – Circuit-EM co-simulation • Take into account the design rules – Min Min. spacing, spacing min min. width of the TLs • Take into account the tuning cell dimensions to the TL design (X-dimension) • Take into account MIM capacitors' dimensions – RRequirements i t ffrom th the ddesigner’s i ’ point i t of f view: i • Parameterized differential TL models – Accurate broadband modeling (DC to the 3rd harmonic) – Capture p all the effects » Conductor skin effect » Substrate skin effect » Coupling capacitance © 2008 Ansoft, LLC All rights reserved. Ansoft, LLC Proprietary Analogies Proprietary & Confidential
Page 1 and 2: Fully Integrated Differential Distr
Page 3 and 4: Company Introduction - A New Semico
Page 5 and 6: Distributed Circuit Concept • Pro
Page 7 and 8: Fully Integrated Differential Distr
Page 9: Fully Integrated Differential Distr
Page 13 and 14: Port Setup: •Ports name and posit
Page 15 and 16: DDVCO Design Considerations: HFSS e
Page 17 and 18: DDVCO Design Considerations: Nexxim
Page 19 and 20: HFSS Simulations •All critical Pa
Page 21 and 22: DDVCO Measurements • Output power
Page 23 and 24: Measurements vs. Simulation (Consis
Page 25 and 26: References [1] HH. WWu and d AA. HH

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