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Abstract #4404

MOSFETs as High-Power DC Controlled Capacitors

Benjamin J. Malone1, Jacob Ruff1, John C. Bosshard2, and Steven M. Wright1,3
1Electrical Engineering, Texas A&M University, College Station, TX, United States, 2Engineering Technology & Industrial Distribution, Texas A&M University, College Station, TX, United States, 3Biomedical Engineering, Texas A&M University, College Station, TX, United States

Synopsis

Keywords: New Devices, New Devices, Matching networks, Coil decoupling

Motivation: Varactor diodes find wide application as direct current controlled variable capacitors in low-power RF applications. However, varactors are typically restricted to receive side applications due to low power handling capabilities.

Goal(s): This research aims to develop DC controllable capacitors capable of operating at transmit side power level.

Approach: Controlling drain-to-source voltage of a MOSFET changes the device drain-to-source capacitance. Modules are constructed as drop-in replacements for mechanically variable capacitors.

Results: MOSFETs were successfully used for a broadband matching network and near-zero current decoupling of transmit coils both tested with up to 1000 watts of input power.

Impact: MOSFETs as DC-controllable capacitors provide an alternate to varactor diodes that can be employed in the transmit chain, enabling applications such as matching networks and effective near-zero current decoupling.

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