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A Simple Low Phase Noise Class-F LC Oscillator

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Abstract

This paper presents a new simple resonator for the low phase noise class-F oscillators, which simplifies the design complexity of the transformer-based resonators. Moreover, compared to the transformer-based class-F oscillators, using the proposed resonator enhances the drain current waveform symmetry. As a result, the effects of flicker noise have been lowered on the proposed oscillator’s phase noise. Due to the lower tank equivalent resistance of the resonator, the proposed oscillator shows a better phase noise performance than the conventional LC class-F oscillator at all offset frequencies. The proposed class-F oscillator oscillates at the frequency of 1 GHz, and it is implemented in 0.18 \(\upmu \)m standard CMOS technology. The proposed simple resonator improves the oscillator’s phase noise by 0.32 dBc/Hz in comparison with the transformer-based class-F oscillators and by 4.88 dBc/Hz in comparison with the conventional class-F oscillators. The phase noise at 1 MHz offset frequency and figure of merit is 146.42 dBc/Hz and 189.5 dB, respectively, for the proposed class-F oscillator.

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Authors and Affiliations

  1. Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave, Tehran, 15914, Iran

    Mohammad B. Ghiasi, Mohsen Moezzi & Amir Kashi

Authors
  1. Mohammad B. Ghiasi
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  2. Mohsen Moezzi
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  3. Amir Kashi
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Correspondence to Mohsen Moezzi.

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Ghiasi, M.B., Moezzi, M. & Kashi, A. A Simple Low Phase Noise Class-F LC Oscillator. Circuits Syst Signal Process 41, 3041–3049 (2022). https://doi.org/10.1007/s00034-021-01929-w

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