This 900 MHz Amplifier Circuit is built with BFG480W which has a good linearity performance. Therefore the BFG480W is well suited for LNAs with high linearity demands, such as Code Division Multiple Access (CDMA) systems. This application note gives an example of a 900 MHz LNA with the BFG480W.
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. Download it in PDF format!
With the new Philips silicon bipolar double poly BFG400W series, it is possible to design low noise gsm amplifiers for high frequency applications with a low current and a low supply voltage. These amplifiers are well suited for the new generation low voltage high frequency wireless applications. In this note a first study of such an amplifier will be given. This amplifier is designed for a working frequency of 900MHz. Download PDF format!
The circuit is designed to show the following performance:
Vce=2V, Ic=2mA, VSUP~3.3V
NF<=1.3dB VSWRi<1:2 VSWRo<1:2
A RF power amplifier is required in every wireless system. However there are several ways to design such a power amplifier depending on the requirements. In this thesis, a push-pull power amplifier for 900 MHz is characterized including a new balun design for output matching.
Download the PDF format!
Here are some 900MHz amplifier products with different characteristics and prices.
900 MHz 4 Watt Outdoor Amplifier
This high-power, bi-directional amplifier is designed for 902-928 MHz radio products. Works equally well with all types of radios. Designed in a completely weatherproof housing for all outdoor applications. The unit is powered over coax with DC injector. The complete set includes: Outdoor Amplifier, DC Injector, Universal Power Supply, (110~240VAC to 12 VDC).
900 MHz 10Watt Amplifier, Outdoor Unit
This high power, bi-directional amplifier is designed for 902~928 MHz radio products. Works equally well with all types of radios. Designed in a completely weatherproof housing for all outdoor applications. The unit is powered over coax with DC injector.