Electronic Design

Broadband Power Amplifiers Offer 30- To 450-W Operation

Teseq Inc. has added five broadband models that operate from 0.8 to 3.1 GHz and 2 to 6 GHz with power levels ranging from 30 to 450 W to its line of power amplifiers. According to the company, they offer higher reliability and excellent performance in demanding electromagnetic-compatibility (EMC) environments with non-ideal load conditions due to antenna mismatch caused by equipment under test in the antenna’s path.

Three Class A models are based on gallium-arsenide (GaAs) IC technology, offering significantly better compression characteristics and increased efficiencies than previous silicon-based lowpower amplifiers, Teseq says. The GaAs-based design provides low-distortion linear performance across the 0.8- to 3.1-GHz operating range and ensures that the power amplifiers operate at full power without interruption, even when there is a short or open circuit.

Two additional models based on gallium-nitride (GaN) technology deliver consistent power into the poor and variable match typically found in the 2- to 6-GHz range, resulting in more accurate and repeatable measurements, the company says. The GaN balanced pair design provides a high breakdown voltage to easily handle high levels of reflected power caused by the presence of the equipment under test.

The frequency ranges and power levels have been matched to the application requirements for extending IEC/EN 61000-4-3 radiated immunity testing to 6.0 GHz and for automotive immunity tests to 3.1 GHz. For increased efficiency, all of the units are powered from a switch-mode power supply for a high power factor and a wide voltage operating range. Integral fans cool the units, and an excess temperature sensor prevents faulty cooling.

Each mode can be equipped with an optional USB interface. A safety interlock connector activated by a short circuit to ground puts the amplifiers in standby mode when necessary. Indicators on the front panel display overtemperature and RF interlock conditions (see the figure). Harmonics are better than –20 dBc and stability is unconditional, eliminating the chance of oscillation to yield better testing results. Operating temperature ranges from 0°C to 40 °C (32°F to 104°F).

Teseq Inc.


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