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Whitepaper – RF Switch FET Low Frequency Power De-Rating: Design Challenges and Trade-Offs

Learning Outcomes

RF Switch FET Low Frequency Power De-Rating explores the intricate balance between power handling, switching speed, and RF performance in SOI switch design. As RF applications push toward lower frequencies and higher power, engineers face critical trade-offs in component tuning and reliability. 

Whether you’re designing for DC-to-GHz performance or optimizing switch architecture for rugged environments, this guide offers a practical overview of the challenges and solutions in low-frequency RF switch design. 

What you’ll learn inside: 
✔️ Why low-frequency power de-rating occurs in RF SOI switches and how gate resistance and capacitance contribute 
✔️ The mechanisms behind electromigration and oxide breakdown in switch FETs 
✔️ How voltage distribution across stacked FETs impacts reliability and performance 
✔️ The role of gate resistor (Rg) and off-state capacitance (Coff) in tuning power handling and insertion loss 
✔️ How simulation results reveal voltage stress and performance degradation at low frequencies 
✔️ The trade-offs between switching time, bandwidth, and power handling when adjusting Rg and Coff 
✔️ Why increasing Rg is often preferred over modifying Coff—and the limitations of this approach 
✔️ How gate debiasing from GIDL current affects switch performance 
✔️ Design equations for estimating switching time and breakdown voltage 
✔️ How pSemi’s PE42020 switch mitigates low-frequency power de-rating for DC-to-8GHz applications 

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  • Best-in-class RF performance
  • Optimal form factors with high levels of integration
  • Proven track record in top-tier smartphones
  • Active member of 3GPP and other industry affiliations
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Power Management

  • 5G antenna-integrated module (AiM) co-designed with Murata
  • High-efficiency 26 GHz, 28 GHz and 39 GHz beamforming front ends supporting bands n257, n258, n261 and n260
  • Advanced, highly integrated package and antenna technology
  • Modular AiM approach for building scalable antenna arrays
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Markets

  • Best-in-class RF performance
  • Optimal form factors with high levels of integration
  • Proven track record in top-tier smartphones
  • Active member of 3GPP and other industry affiliations

  • RF Switches All

    Industry-leading linearity and RF performance
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Monolithic CMOS solution that integrates RF, analog and digital
    Best-in-class ESD and reliability

  • High Linearity RF Switches

    Industry-leading linearity and RF performance
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Monolithic CMOS solution that integrates RF, analog and digital
    Best-in-class ESD and reliability

  • High Isolation RF Switches

    Industry-leading isolation and RF performance
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Monolithic CMOS solution that integrates RF, analog and digital
    Best-in-class ESD and reliability

  • Low Insertion Loss RF Switches

    Industry-leading insertion loss and RF performance
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Monolithic CMOS solution that integrates RF, analog and digital
    Best-in-class ESD and reliability

  • Antenna Tuning Switches

    Industry-leading RF power handling and ruggedness
    Best-in-class harmonic and linearity
    Small form factor with robust ESD and reliability

  • 75Ω Wired Broadband Switches

    Unmatched linearity performance for DOCSIS 3.1
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Monolithic CMOS solution that integrates RF, analog and digital
    Best-in-class ESD ratings and reliability

  • Broadband RF Switches

    Wideband support with a frequency range from 0 Hz to 67 GHz
    Industry-leading insertion loss, isolation, linearity and settling time
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Best-in-class ESD and reliability

  • High Power Switches

    Industry-leading power handling and RF performance
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Monolithic CMOS solution that integrates RF, analog and digital
    Best-in-class ESD and reliability

  • Automotive Switches

    AEC-Q100 Grade 2-certified supporting temperatures up to +105°C
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Monolithic CMOS solution that integrates RF, analog and digital
    Best-in-class ESD and reliability

  • Extended Temperature RF Switches

    Wide temperature range support from -55°C to +125°C
    HaRP™ technology enhancement reduces gate lag and insertion loss drift
    Monolithic CMOS solution that integrates RF, analog and digital
    Best-in-class ESD and reliability

  • 75Ω Wired Broadband RF Digital Step Attenuators

    High linearity, fast switching time with wide bandwidth
    Best-in-class attenuation error with fine attenuation steps
    Monolithic CMOS solution that integrates RF, analog and digital
    Excellent ESD protection and reliability

  • Glitchless RF Digital Step Attenuators

    High linearity, fast switching time with wide bandwidth
    Best-in-class attenuation error with fine attenuation steps
    Monolithic CMOS solution that integrates RF, analog and digital
    Excellent ESD protection and reliability

  • General-purpose RF Digital Step Attenuators

    High linearity, fast switching time with wide bandwidth
    Best-in-class attenuation error with fine attenuation steps
    Monolithic CMOS solution that integrates RF, analog and digital
    Excellent ESD protection and reliability

  • 2.4 GHz IoT FEMs

    Industry-leading monolithic Wi-Fi RF front-end solutions
    High linearity performance for Wi-Fi 6 and W-Fi 6E
    Compact form factors integrating high-performance RF, analog and digital
    Best-in-class ESD and reliability

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    Ideal solutions for optimizing transmission phase angle
    Low root-mean-square (RMS) phase and amplitude error with fine phase resolution
    Digital control interface with parallel and serial programming options
    Best-in-class ESD and reliability

  • Monolithic Phase & Amplitude Controllers (MPACs)

    Reliable phase and amplitude control for next-generation communications
    Monolithic CMOS solution that integrates RF, analog and digital
    Integrated solution for Doherty power amplifier optimization (MPAC–Doherty)

  • Digital Tunable Capacitors (DTCs)

    Small form factor with high Q
    Monolithically integrated impedance tuning solution
    Wide-band tuning coverage, minimum mismatch losses, high linearity and fast switching speed
    Best-in-class ESD and reliability

  • Power Limiters

    Highly integrated solutions, smaller and more reliable than PIN-diode solutions
    Adjustable threshold control for maximum design flexibility
    High power handling and linearity required for wide-dynamic-range designs
    Fast response and recovery times for instantaneous protection and rapid return

  • Prescalers

    Exceptional performance with high-frequency support up to 13.5 GHz
    Low phase noise performance and low power consumption solutions
    Bare-die solutions for a wide variety of compact high-performance applications
    Best-in-class ESD and reliability

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    Broadband quad MOSFET array cores for high performance
    Industry-leading linearity, isolation and low conversion loss
    Available in MSOP, DFN and QFN packages
    Best-in-class ESD and reliability

  • Switch LNA

    Integrates dual-channel LNA with bypass function & high-power switch
    20W average RF input power
    Low noise figure of 0.9 dB
    +105°C operating temperature

  • Charge Pump Capacitor Divider

    Unique, patented architecture to enable higher overall system, power conversion efficiency
    Fully integrated solutions from 15W to 160W
    Virtually lossless (up to 99% peak) conversion and soft-switching topology
    Parallel operation to higher power levels
    Available through our parent company Murata

  • 2-Stage Buck Regulators

    Family of DC-DC buck voltage regulators ICs and modules for telecoms, datacoms, server and storage applications
    Compact solution size offering best-in-class efficiencies for low profile applications (<1.2mm)
    Fully programmable via I2C and with accurate on-board telemetry
    Available through our parent company Murata

  • 2-Stage Boost Regulators - LED Backlight Drivers

    Ultra-high efficiency (up to 96%) LED boosts for LCD displays
    Product family includes products for 1-cell, 2-cell, and 3-cell inputs such as tablets, notebooks and 2-in-1 convertibles
    Enables very low profile (<0.7 mm) solutions and halves power-conversion losses compared to leading alternatives
    Up to 15-bit resolution via I²C or PWM control
    High accuracy with tight matching at low LED current

  • Multi-level Converters

    Industry-first 4-level and 3-level conversion for fixed input voltages (USB_PD)
    Configurable as charge pump divide-by-3 and divide-by-2 for variable input voltages (USB_PPS)
    Wide range input voltage 4.5V to 18V compatible with USB and wireless charging Qi sources
    Reverse boost capability
    High-accuracy current and voltage telemetry
    Best-in-class efficiency for low-profile applications (<1 mm)
    Targets fast-charging battery applications

Power Management

  • Unique, patented architecture to enable higher overall system, power conversion efficiency
  • Fully integrated solutions from 15W to 160W
  • Virtually lossless (up to 99% peak) conversion and soft-switching topology
  • Parallel operation to higher power levels
  • Available through our parent company Murata
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Integrated products

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RF Mixers & Limiters

  • Exceptional performance with high-frequency support
  • Highly integrated, reliable solutions in a small form factor
  • Variety of packaging options for maximum design flexibility
  • Best-in-class ESD and reliability
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Front End Modules

  • Industry-leading monolithic Wi-Fi RF front-end solutions
  • High linearity performance for Wi-Fi 6 and W-Fi 6E
  • Compact form factors integrating high-performance RF, analog and digital
  • Best-in-class ESD and reliability
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RF Phase & Amplitude Control

  • Reliable phase and amplitude control for next-generation communications
  • Monolithic CMOS solution that integrates RF, analog and digital
  • Digital control interface with parallel and serial programming options
  • Best-in-class ESD and reliability
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RF Attenuators

  • High linearity, fast switching time with wide bandwidth
  • Best-in-class attenuation error with fine attenuation steps
  • Monolithic CMOS solution that integrates RF, analog and digital
  • Excellent ESD protection and reliability
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RF Switches

  • Industry-leading RF performance
  • HaRP™ technology enhancement
  • Monolithic CMOS solution that integrates RF, analog and digital
  • Best-in-class ESD and reliability
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