Teledyne Cougar’s new line of mediumpower broadband amplifiers is a family of performance-based solutions designed for demanding applications. The line covers 20 MHz to 2600 MHz and uses Gallium Nitride (GaN) technology. Each amplifier is hermetically sealed and includes multiple RF performance options so engineers can specify standard catalogue or custom-tuned performance.
The amplifiers include an internal sequencer, assuring application of the proper gate voltage applied to the FET prior to voltage applied to the drain. Higher-gain versions include pre-amps, providing excellent noise figure and IP performance. The small package footprint is designed for high-performance applications and operates from -40 to +85°C, with heatsinking required.
External DC blanking control is available on certain models to allow for the DC power to shut down on the output power module. TTL low or no voltage on the blanking pin turns the DC power back on. In addition, a voltage sequencer is included that prevents the power module from turning on before the proper gate voltage is applied to the GaN FETs. Larger packages also include an over-temperature shut down that turns the DC off on the output module until its temperature drops to a safe level.
A temperature sensor is located near the GaN die that provides a voltage in proportion to the temperature and is sent to a comparator circuit that trips a TTL high voltage if it exceeds the factory preset voltage, indicating an over-temperature condition. Hysteresis is built in so that when the unit cools down about 5°C it automatically turns the DC power back on. The trip temperature is set at the factory and tends to increase slightly with increased RF signal, hence avoiding premature shut down with a short duration burst signal.
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