Exploiting Ambipolarity in Graphene Field-Effect Transistors for Novel Designs on High-Frequency Analog Electronics.

Area of Science:

• Materials Science
• Electrical Engineering
• Electronics

Background:

• Graphene field-effect transistors (GFETs) exhibit ambipolar electrical conductivity, a property of significant interest for analog electronics.
• Conventional analog circuits often require complex designs, motivating the search for simplified and multifunctional alternatives.

Purpose of the Study:

• To explore the potential of GFETs' ambipolarity for high-frequency (HF) analog electronics.
• To demonstrate how controlling GFET polarity can simplify circuit design and enable multifunctionality.
• To present design insights for various HF applications leveraging GFET ambipolarity.

Main Methods:

• Biasing graphene transistors around the vertex of their V-shaped transfer curve to control device polarity.
• Investigating the application of this control in the design of HF analog circuits.

Main Results:

• Demonstrated the feasibility of redesigning and simplifying conventional analog circuits using GFETs.
• Showcased the potential for achieving multifunctionality in HF electronic devices.
• Provided design insights for specific HF applications including power amplifiers, mixers, frequency multipliers, phase shifters, and modulators.

Conclusions:

• GFET ambipolarity is a key property for developing advanced HF analog electronics.
• Controlling GFET polarity offers a pathway to simplified and multifunctional circuit designs.
• This approach enables novel solutions for a wide range of HF applications.