OMB EM 100 DIG - 3.5 R.F. Power Amplifier module

FM Transmitter
Sistemas Electrónicos S.A EM 100 DIG
Technical Manual - v1.2 - November 2005 44
3.5 R.F. Power Amplifier module.
This stage is designed with only one high-gain BLF-278 MOSFET RF power transistor capsule, in a
broadband class AB
1
common emitter design.
The elements contained in this module are:
1 - Cooling fan directed towards heat sink's cooling fins.
2 - Output low pass filter and directional coupler.
3 - RF output Power amplifier section.
4 - Main Power supply.
6 - BLF-278 MOSFET output power amplifier twin-transistor capsule.
7 - RF output connector.
8 - RF monitor output.
Output amplifier stage detail can be seen in Figure 3-3:
Fig. 3-3: DETAIL OF OUTPUT AMPLIFIER SECTION.