The HMC7748 from Analog Devices is a multistage power amplifier (PA) module that operates from 2 GHz to 6 GHz. It provides a saturated output power of 25 W with a gain of 60 dB and has a noise figure of up to 6 dB. The module operates from a 12 V and 28 V supply while drawing 0.7 A and up to 4 A of current respectively. It has a built-in bias sequencing, which protects the amplifiers if 28 V is applied without 12 V supply applied. An external enable pin causes the module to remain in shutdown mode unless the pin is pulled to ground. This module is ideal for telecom infrastructure, test instrumentation and military applications.
The 12 V supply is regulated internally and generates the negative voltage required for the gate bias. Built-in bias sequencing prevents the drain voltages for the amplifier stages from being applied without the negative voltage present, which protects the amplifier if 28 Volts is applied without the 12 V supply. An external enable pin causes the module to remain in shutdown mode unless the pin is pulled to ground. This pin provides a means of turning the amplifiers off and on without cycling the power supplies.
