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900 MHz Radio Amplifier Circuit

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!

900MHz Amplifier Circuit Diagram BFG480W

Components List

bfg480w gsm amp components list

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:
transistor: BFG410W
Vce=2V, Ic=2mA, VSUP~3.3V
freq=900MHz
Gain~15dB
NF<=1.3dB VSWRi<1:2 VSWRo<1:2

BFG410W 900 MHz amplifier circuit diagram

900mhz amplifier bfg410w

900MHz Power Amplifer Module in Multilayer-Laminate Technology

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.
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900 MHz amplifier products

Here are some 900MHz amplifier products with different characteristics and prices.

900 MHz 4 Watt Outdoor Amplifier
900MHz amp 4wattThis 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).
Specifications:

  • Operating Range 902-928 MHz
  • Operating Mode TDD, Time Division duplex
  • Transmit Power 36 dB, 4 Watt
  • Transmit Gain 26 dBm max
  • Transmit Input Power 7 dBm min 23 dBm max
  • Receive Gain 28 dB
  • Noise Figure 3.5 dB

900 MHz 10Watt Amplifier, Outdoor Unit
900MHz amp 10wattThis 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.

Specifications:

  • Operating Range 902-928 MHz
  • Operating Mode TDD, Time Division duplex
  • Transmit Power 40 dBm, 10Watt (+44 dBm*, 25Watt*)
  • Transmit Gain 30 dB
  • Transmit Input Power 12 dBm (min) 25 dBm (max)
  • Receive Gain 19 dB
  • Noise Figure 42.9 dB
  • P1DB for LNA 10 dBm
  • Power Consumption 110mA Rx, 3560 mA Tx @ 12 VDC

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