GaN power amplifier modules target mil/aero surveillance

7th April 2017

Analog Devices

Caroline Hayes

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A pair of GaN power amplifier modules from Analog Devices are claimed to offer one of the highest power-density levels in their class. Benefits of the increased density are to minimise size and weight of the sub-system. The HMC7885 and HMC7748 broadband modules target applications operating between 2 and 6GHz, including test and measurement, communications, Traveling Wave Tube (TWT) replacement, military/aerospace surveillance and countermeasures, and radar.

The integrated, all solid-state devices expand the company’s range of GaN-based PAs, and can accelerate prototyping and system design, says the company.

The HMC7885 is a 32W, hermetically sealed, hybrid amplifier. It is housed in a hermetic, flange-mount package and designed for high-reliability applications. This hybrid amplifier typically provides 21dB of small-signal gain and 45dBm of saturated RF output power. The PA draws 2.2A of quiescent current from a 28V DC supply. Both RF input and output are DC blocked and matched to 50Ω. An evaluation board is available with layout and bill of materials.

The HMC7748 is an integrated, multi-stage PA module which delivers 25W of saturated output power. It accepts inputs up to -8dBm and provides small-signal gain of 60dB. It includes bias sequencing and regulation, and is also internally matched to 50Ω. The PA draws 0.7A from a 12V supply and up to 4.0A from a 28V supply. An enable pin provides shutdown capability so the amplifier can be turned on and off without cycling the power supplies.

The HMC7885 is available in an 18-lead hermetic, ceramic/metal multichip module, and the HMC7748 is available in a six-lead module, measuring approximately 3.75 x 3.0 x 0.6 inches.

PCIM Europe 2017 Stand 6-458