900MHz RF Amplifier based BFG480W

Circuit Diagram:

This is the circuit diagram of 900MHz RF amplifier built based transistor BFG480W manufactured by Philips. The circuit features low noise, good linearity performance and works well for high frequency application.


This is the initial conditions apply for the amplifier design:

• Vsupply » 3.6 V
• VCE » 2 V
• IC » 20 mA
• f = 900 MHz.

The circuit is designed to show the following performance:

• |s21|² » 15 dB
• VSWRIN < 2
• VSWROUT < 2
• NF </= 2 dB
• IP3_i > 9 dBm.

The input and output matching is realised with an LC-combination. Also extra emitter inductance (micro stripline) is used
on both emitter-leads to improve the matching and the noise figure.


Components List:

PCB Layout:

Download the explanation about this 900MHz RF Amplifier circuit based BFG480W in PDF file:
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About RF Amplifier
An RF power amplifier is a type of electronic amplifier which is utilised to convert a low-power radio-frequency signal into a larger signal of significant power, usually for driving the antenna of a transmitter. It is usually optimized to have high efficiency, high output Power (P1dB) compression, good gain, good return loss on the input and output, and optimum heat dissipation.

The basic applications of the RF power amplifier include driving to another high power source, driving a transmitting antenna, microwave heating, and exciting resonant cavity structures. Among these applications, driving transmitter antennas is most well known.
More explanation about power audio amplifier can be found at wikipedia.org

This is a demonstration about 01A RF Amplifier which is build used old tube component to amplify the signal.

Watch the video: