RF power amplification and lower-frequency power amplification are genuinely different design problems. Aigtek's ATA-8000 series is purpose-built for the RF range — 100kHz to 25MHz — with a rated output power of 300W and a 1dB gain compression point extending to 600W, designed to pair directly with mainstream signal generators for lossless RF amplification.
Why 1dB Compression Matters for RF Amplifier Selection
The P1dB point — the output power at which gain has compressed by 1dB from its small-signal value — marks the practical upper boundary of linear operation. The ATA-8000 series' 600W P1dB rating against a 300W nominal rated output gives real headroom above the amplifier's continuous rating, useful for signals with peaks above their average power (a common characteristic of modulated RF signals) without running the amplifier into compression.
Class A vs Class AB — Choosing an Operating Class
| Model | Class | Bandwidth | P1dB Output | Saturation Output | Gain |
|---|---|---|---|---|---|
| ATA-8055 | A | 100kHz–5MHz | 250W | 500W | 51dB |
| ATA-8255 | A | 100kHz–25MHz | 50W | 100W | 44dB |
| ATA-8126 | A | 100kHz–12MHz | 300W | 600W | 52dB |
| ATA-8222 | AB | 100kHz–22MHz | 20W | 40W | 40dB |
| ATA-8152 | AB | 100kHz–15MHz | 100W | 200W | 47dB |
| ATA-8202 | A | 100kHz–20MHz | 100W | 200W | 47dB |
Class A models bias the amplifying devices to conduct across the full signal cycle, giving better linearity at the cost of efficiency — the right choice where signal fidelity matters most. The Class AB models (ATA-8222, ATA-8152) trade some linearity for improved efficiency, a reasonable choice where the application tolerates it. Bandwidth and power both narrow as you move to the higher-frequency end of the range — the ATA-8126's 300W P1dB is only available up to 12MHz, while the ATA-8255 extends to 25MHz at a much lower 50W rating.
Selecting a Model
Start from your required operating frequency and target output power, and note that the two aren't independent — the highest-power models in this series don't extend to the highest frequencies. Confirm your target frequency falls within a given model's bandwidth before comparing power ratings between models.
Finch Electronic Solutions — Melbourne, Australia
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