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DESCRIPTION The RA20H8994M is a 20-watt RF MOSFET Amplifier Module for 12.5-volt mobile radios that operate in the 896- t0 941-MHz range. The battery can be connected directly to the drain of the enhancement-mode MOSFET transistors. Without the gate voltage (VGG=OV), only a small leakage current flows into the drain and the RF input signal attenuates up t0 60 dB. The output power and drain current increase as the gate voltage increases. With a gate voltage around 4V (minimum), output power and drain current increases substantially. The nominal output power becomes available at 4.5V (typical) and 5V (maximum). At VGG=5V, the typical gate current is l mA. This module is designed for non-linear FM modulation, but may also be used for linear modulation by setting the drain quiescent current with the gate voltage and controlling the output power with the input power.
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