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A Complementary Class F23 Oscillator With Additional Third Harmonic Resonant Tanks
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DOI：10.1002/mop.70533.png)
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Abstract
En 中文
A novel complementary ClassF23 voltage-controlled oscillator (VCO) is proposed. The design employs a transformer-based tank and integrates two additional LC tanks that provide resonance at the third harmonic frequency. This harmonic superposition enables a sharp zero-crossing region, which minimizes the effective Impulse Sensitivity Function (ISF), and consequently further improves phase noise (PN). Simulation results show that the additional third harmonic resonance contributes to a 1.4 dB reduction in phase noise compared with a standard Class F-1 oscillator. Fabricated in a 180 nm CMOS process, the prototype VCO occupies an area of 0.88 & times; 1 mm2. Measurement results show a tuning range of 4.26-4.58 GHz. The PN at 1 MHz offset is -126 dBc/Hz from the 4.26 GHz carrier frequency, with an average PN better than -120 dBc/Hz across the entire tuning range. A figure-of-merit (FoM) of 190.6 dBc/Hz is obtained at the 1 MHz offset. Under a 1.8 V supply voltage, the proposed design consumes a power of 6.2 mW.
Keywords:
Class F23 oscillator
CMOS
impulse sensitivity function (ISF)
phase noise (PN)
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1.2
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