研究目的
To propose a new quadrature oscillator topology that arranges four low-Q series LC tanks in a ring structure driven by inverters operating in class-D, aiming for a very small area, better phase noise, and wide tunability.
研究成果
The proposed oscillator topology with four series LC tanks in a ring structure offers a significant reduction in phase noise and maintains a wide tuning range, occupying the same chip area as ring oscillators.
研究不足
The use of low-Q inductors and the need for a startup circuit to initiate oscillation.
1：Experimental Design and Method Selection:
The oscillator core consists of four series LC tanks arranged in a ring structure driven by inverters operating in class-D.
2：Sample Selection and Data Sources:
The oscillator is fabricated in TSMC 40-nm CMOS process.
3：List of Experimental Equipment and Materials:
Tiny inductors are used for the oscillator core, each a 17-turns spiral inductor using two available top thick metals in parallel.
4：Experimental Procedures and Operational Workflow:
The oscillator's performance is measured using R&S? FSW spectrum analyzer.
5：Data Analysis Methods:
Phase noise and FoM are measured across the tuning range.
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