The NXP BF981 is a high-performance silicon MOS dual-gate N-channel enhancement-mode field-effect transistor (FET) designed for use in VHF and UHF applications. This versatile transistor is known for its low noise figure, high gain, and excellent cross-modulation performance, making it an ideal choice for demanding RF front-end applications.

Key Features

• Low Noise Figure: The BF981 boasts a very low noise figure, which is essential for applications where signal clarity and integrity are of utmost importance.
• High Gain: It provides a high forward transfer admittance, which is a measure of the device's ability to amplify a signal, thus ensuring strong performance in amplification circuits.
• Dual-Gate Design: The dual-gate structure allows for excellent frequency control and makes it suitable for mixer and oscillator circuits.
• Enhanced Cross-Modulation Performance: The BF981 is engineered to minimize cross-modulation, which is critical in maintaining signal quality in environments with multiple signal sources.
• Wide Frequency Range: This FET is designed to operate effectively across a broad range of frequencies, making it a flexible component for various VHF and UHF applications.

Applications

The NXP BF981 is commonly used in a variety of RF applications, including but not limited to:

• RF amplifiers in VHF and UHF bands
• Mixers and oscillators in television receivers
• Low-noise block downconverters (LNBs) for satellite receivers
• Professional communication equipment
• RFID and wireless infrastructure

Technical Specifications

Some of the key technical specifications for the NXP BF981 include:

• Drain-source voltage (Vds): 20V
• Gate-source voltage (Vgs): ±20V
• Drain current (Id): 30mA
• Forward transfer admittance (Yfs): 30mS
• Power dissipation (Ptot): 300mW

Overall, the NXP BF981 is a reliable and efficient solution for RF signal processing, offering a combination of low noise, high gain, and robust performance across a wide range of frequencies. Its technical merits make it a staple component in the design of high-fidelity VHF and UHF electronic systems.