Choosing a Millimeter Wave Power Amplifier starts with the frequency band and the signal it must support. A design for a short-range 60 GHz link may need different output power and bandwidth from one serving a 28 GHz radio. Define the required gain, saturated output power, and linearity before comparing parts. For modulated signals, check error vector magnitude and adjacent-channel performance at the intended output level—not only headline power. Small details matter.
Read the test conditions behind each specification. Gain and efficiency can change with frequency, bias, temperature, and load. Confirm that the amplifier’s usable bandwidth covers the full signal, and review stability, input and output matching, and recommended operating conditions. Heat changes everything. A compact package beside a warm processor may need a careful thermal path, even when its typical efficiency looks adequate. Also consider supply voltage, control features, connector or package transitions, and whether evaluation-board results match your planned layout.
A useful selection process connects the component to the whole radio. Estimate link-budget needs, account for cable and antenna losses, then leave sensible margin without oversizing the amplifier. Compare typical and guaranteed values, and ask suppliers about missing test data or application support. A clean datasheet can still leave gaps; measurement setup and board layout affect real results. Bench testing in the intended configuration is the final check. The right choice is not simply the part with the highest output power. It is the one that meets system targets reliably, within thermal and electrical limits, with performance you can verify.
Choose the amplifier’s frequency band from the radio channel, not a broad “mmWave” label. 3GPP TS 38.104 places NR FR2-1 at 24.25–52.6 GHz, but regional allocations and channel widths vary. That span is not one interchangeable target. A 28 GHz fixed-access link and a 39 GHz backhaul radio need different matching, filtering, and output-stage choices.
Then define the application’s real operating conditions. A rooftop point-to-point link may need stable output power and linearity across a wide modulated signal. An indoor access point may instead prioritize compact size and heat control. Small differences matter. The ITU-R M.2410-0 benchmark sets IMT-2020 peak rates at 20 Gbit/s downlink and 10 Gbit/s uplink; these are system-level targets, not promises from one amplifier. Use them to understand bandwidth demands, not to select output power alone.
Check the exact center frequency, occupied bandwidth, modulation, duty cycle, and temperature range against the amplifier’s test conditions. For outdoor equipment, include cable and antenna losses in the link budget. A datasheet number can look convincing on a bench. It may shift under heat or sustained operation, so validate the chosen band and waveform in the intended enclosure. The first selection is rarely perfect; measurements often reveal an assumption worth revisiting.
