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Anti-series varactor network with improved linearity performances in the presence of inductive and capacitive parasitics

David Berthiaume, Jean-Jacques Laurin and Nicolas G. Constantin

Article (2021)

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Abstract

This paper proposes a varactor-based circuit technique intended for amplitude and phase control, with improved linearity in the presence of parasitic capacitances and parasitic inductances. The mechanism causing linearity degradation in an anti-series varactor network that includes significant parasitic elements - a key aspect that, to our knowledge, has never been reported - is first studied using an analytical approach based on multi-tone excitation. It is demonstrated that simply optimizing the ratio of diode sizes is insufficient to circumvent this linearity degradation. The underlying linearity degradation concept serves as the basis for the introduction of a modified anti-series controllable capacitance, followed by a design and practical implementation. Experimental validations with multi-tone and modulated signals demonstrate improved linearity performances with respect to the state-of-the-art when parasitic capacitances and inductances are significant. Moreover, it is shown that the complete varactor-based circuit topology proposed here, which uses the proposed modified anti-series controllable capacitance in conjunction with a second-harmonic trap filter, constitutes a very attractive alternative to the state-of-the-art anti-series/anti-parallel topology, since it reduces the required number of diodes by a factor of 2. Measurements on discrete-component designs operating at 3.6GHz, hence with significant parasitic effects, demonstrate that the proposed circuit topology improves the 3 rd order intermodulation distortion levels by 10.6dB and 6.6dB at output powers of 10dBm and 18dBm respectively, in comparison with the state-of-the-art topology. Measurements with a 16QAM modulated signal also show 3.9dB improvement in ACPR at 18dBm. These performances constitute improved state-of-the-art results in anti-series hyper-abrupt varactor-based electronic control.

Uncontrolled Keywords

Adjacent channel power ratio (ACPR) ; amplitude ; anti-series ; controllable ; diode ; distortion ; intermodulation distortion (IMD) ; impedance ; linearity ; linearization techniques ; magnitude ; multi-tone ; parasitic ; phase ; reconfigurable ; spatially-fed antenna ; transmitarray ; tunable ; varactor ; variable

Subjects: 2500 Electrical and electronic engineering > 2500 Electrical and electronic engineering
2500 Electrical and electronic engineering > 2506 Electronic circuits and devices
2500 Electrical and electronic engineering > 2515 Electronic materials and components
Department: Department of Electrical Engineering
Research Center: POLY-GRAMES - Advanced Research Centre in Microwaves and Space Electronics
Funders: CRSNG / NSERC, Fonds de Recherche du Québec - Nature et Technologies (FRQNT), Consortium for Research and Innovation in Aerospace in Quebec (CRIAQ), Thales Canada, MDA Corporation
PolyPublie URL: https://publications.polymtl.ca/9325/
Journal Title: IEEE Access (vol. 9)
Publisher: IEEE
DOI: 10.1109/access.2021.3069090
Official URL: https://doi.org/10.1109/access.2021.3069090
Date Deposited: 27 Feb 2023 10:29
Last Modified: 09 Dec 2024 05:04
Cite in APA 7: Berthiaume, D., Laurin, J.-J., & Constantin, N. G. (2021). Anti-series varactor network with improved linearity performances in the presence of inductive and capacitive parasitics. IEEE Access, 9, 48325-48340. https://doi.org/10.1109/access.2021.3069090

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