A 1.25-GHz fully integrated dc-dc converter using electromagnetically coupled class-D LC oscillators
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Author (Corporation)
Publication date
2021
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01A - Journal article
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IEEE Journal of Solid-State Circuits
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Volume
56
Issue / Number
12
Pages / Duration
3639-3654
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IEEE
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Abstract
Fully integrated power management circuits are promising candidates to provide small form factors and meet high power density demand of modern computing platforms. This article presents a new fully integrated dc–dc converter topology based on electromagnetically coupled class-D LC oscillators that enables up to 2.5 GHz switching frequency, allowing aggressive scaling of the on-chip passives. On-chip transformers and flying capacitors are designed to electromagnetically couple the two oscillators, and gigahertz-range switching frequency is achieved by the quasi-adiabatic switching of the parasitic capacitors. The proposed converter is implemented in a 0.18- μm CMOS process occupying 1.61 mm2 for 7.8 nH inductance (high efficiency version) and 0.37 mm2 for 3.1 nH (high power density version), achieving 1 W/mm2 peak power density. This work also proposes a duty-cycling scheme that improves the efficiency under light loads, which stays close to the peak from 4 μW up to 0.5 W, and in continuous operation mode the output voltage ripple is 12 mV without attaching any output capacitor thanks to the four-phase electromagnetic power delivery scheme.
Keywords
Inductors, Oscillators, Voltage control, Capacitors, DC-DC power converters, System-on-chip, Switching frequency, Power transformers, DC-DC converters, fully integrated voltage regulator (FIVR), on-chip transformer, power management, resonant converters, spiral inductor, switched-capacitor (SC)
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ISBN
ISSN
0018-9200
1558-173X
1558-173X
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Zero Emission
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
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Citation
Novello, A., Atzeni, G., Künzli, J., Cristiano, G., Coustans, M., & Jang, T. (2021). A 1.25-GHz fully integrated dc-dc converter using electromagnetically coupled class-D LC oscillators. IEEE Journal of Solid-State Circuits, 56(12), 3639–3654. https://doi.org/10.1109/JSSC.2021.3112129