If the low-noise amplifier is the polite part of a radio, the power amplifier is the loud one. Its only real job is to make the signal strong enough to leave the antenna and reach the other end — but doing that efficiently, linearly and without cooking itself is where the engineering lives. This guide covers where power amplifiers are used and what to look at when you select or source one.
Where PAs show up
- Cellular base stations — high output power, high linearity, often cooled.
- Handsets — small, efficient PAs bundled into the front-end module.
- Wi-Fi and small cells — moderate power, very cost and efficiency sensitive.
- Satellite and point-to-point — high linearity over wide bandwidth.
- Industrial and medical RF — specialised frequencies and power levels.
The three numbers that decide the part
Output power at compression. P1dB (the point 1 dB below linear) or Psat tells you the usable transmit level. Efficiency. A more efficient PA wastes less as heat, which simplifies thermal design and extends battery life. Linearity. Under a real modulated signal, a non-linear PA spreads energy into neighbouring channels and fails the spectral mask. For most modern systems linearity is the harder constraint.
We stock transmit and driver amplifiers such as the RFPA3800TR13 and SBB-3089Z, and gain blocks like the MGA-30889-TR1G that support driver and small-signal stages.
The parts around the PA
A PA rarely works alone. A low-loss switch selects the band or routes transmit versus receive, and filters suppress the harmonics the amplifier inevitably generates. We supply switches such as the QPC6044TR13 and filters such as the LFCN-3800+ low-pass filter for exactly this role.
Sourcing PAs without getting burned
Power amplifiers are frequently the allocated or end-of-life line in a radio bill of materials, because they are application-specific and vendor-concentrated. We help by supplying from traceable channels, verifying date codes, and finding equivalent alternatives where a part is unavailable. Browse the RF and interface chip range and the Qorvo collection for related devices.
Frequently asked questions
What does a radio-frequency power amplifier actually do?
It takes a small RF signal from the transceiver and increases its power to the level the antenna needs to transmit. Everything else — efficiency, linearity, bandwidth — is a trade-off around that basic job. A phone PA, a base-station PA and a satellite PA solve the same problem under very different constraints.
What specifications decide a PA choice?
Output power at compression (P1dB or Psat) sets how far you can transmit. Efficiency sets how much heat and battery you burn. Linearity, often expressed as adjacent-channel leakage or OIP3, decides whether you pollute neighbouring channels under modulation. The output matching network and thermal design decide whether the part survives.
Why does linearity matter as much as power?
Modern modulated signals (the kind used in 4G, 5G, Wi-Fi) are unforgiving. A non-linear amplifier smears energy into adjacent channels and fails regulatory masks, even if it delivers the raw power. So a slightly lower-power but more linear PA is often the better choice.
Can you supply RF power amplifiers and driver stages?
Yes. We stock power and driver amplifiers such as the RFPA3800TR13 and SBB-3089Z, plus supporting gain blocks. Send the part number, package and quantity and we will quote availability and date code.
About us & trademarks: JTDZ Tech (Shenzhen Jingteng Electronics Technology Co., Ltd.) is an independent distributor of electronic components. We are not an authorised distributor or representative of the manufacturers named in this article. Manufacturer and part names are used for indicative purposes only, to help identify the components discussed; all trademarks remain the property of their respective owners. Always verify specifications against the manufacturer's datasheet before design-in or purchase.
