Here's a 300 watt singleended RF power amplifier for the FM broadcast band. This broadband FM power amplifier with simplicity and reliability is possible and compact to design and build at low cost.
This RF power amplifier using the low cost OMP Freescale MRF6V2300N LDMOS transistor. It operates at Vdd = 50 VDC with an average drain efficiency in excess of 60% and a gain of 24 dB with a 1 dB gain flatness over the 88-108 MHz band. No tuning is required as the amplifier is broadband.
The following is a partial list of desired features:
- Power amplifier device: MRF6V2300N LDMOS RF OMP transistor.
- Single ended design.
- DC supply 50 VDC.
- Class AB2 operation, Idq = 900 mA.
- P1dB = 300 W across the band.
- Gain ≈ 24 dB; IRL ≤ –10 dB across the band.
- Efficiency ≈60% across the band.
- 50 Ω input and output impedances at the test fixture RF connectors.
- Must fit into a standard Freescale 4” × 6” test fixture PC board space.
- Must be compatible with standard hardware, heatsink, Cu heat spreader, mounting plates and N type RF connectors.
Source: A 300 W Power Amplifier for the 88 to 108 MHz FM Broadcast Band.
