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<p>This paper presents a compact tunable microstrip resonator-based filter incorporating an inversion PMOS (IPMOS) varactor to achieve tunable resonance frequencies. The IPMOS varactor is modeled and optimized at 2.4&#xa0;GHz using an efficient simulation-based approach. Designed within the framework of the TSMC RF CMOS 0.18&#xa0;μm process, the optimized IPMOS varactor achieves a tuning ratio of 2.15 and an unloaded quality factor of 81.4, while operating at a low power supply. A digital approach for the varactor is proposed, using three IPMOS varactors to provide a tuning capacitance ranging from 0.51 to 1.05 pF, controlled by different combinations of digital control bits at a Vdd of 1.8&#xa0;V. The compact tunable resonator-based filter, loaded with the optimized IPMOS varactor, offers a tuning frequency range from 1.79 to 2.04&#xa0;GHz with low insertion loss (IL) variation and good return loss (RL), making these advancements particularly impactful for wireless communication systems where adaptable filtering solutions are essential for efficient frequency spectrum management and enhanced signal integrity.</p>

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A 3-Bit Digital Control of Tunable Microstrip Resonator-Based Filter Using Inversion PMOS Varactor in TSMC RF 0.18 μm CMOS Process

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Abdelhafid Belmajdoub,
  • Abdelaziz Lberni,
  • Mohammed Jorio,
  • Saad Bennani,
  • Ali Ahaitouf

摘要

This paper presents a compact tunable microstrip resonator-based filter incorporating an inversion PMOS (IPMOS) varactor to achieve tunable resonance frequencies. The IPMOS varactor is modeled and optimized at 2.4 GHz using an efficient simulation-based approach. Designed within the framework of the TSMC RF CMOS 0.18 μm process, the optimized IPMOS varactor achieves a tuning ratio of 2.15 and an unloaded quality factor of 81.4, while operating at a low power supply. A digital approach for the varactor is proposed, using three IPMOS varactors to provide a tuning capacitance ranging from 0.51 to 1.05 pF, controlled by different combinations of digital control bits at a Vdd of 1.8 V. The compact tunable resonator-based filter, loaded with the optimized IPMOS varactor, offers a tuning frequency range from 1.79 to 2.04 GHz with low insertion loss (IL) variation and good return loss (RL), making these advancements particularly impactful for wireless communication systems where adaptable filtering solutions are essential for efficient frequency spectrum management and enhanced signal integrity.