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We developed a technique to reduce gain variations over a wide frequency range for an ultra-broadband travelling wave amplifier (TWA) that employs a cascode configuration using 0.15-μm gate InGaP/InGaAs HEMTs. Using this technique, we achieved gain variations within 1.5 dB for frequencies up to 70 GHz with a 9-dB gain. The agreement of measured S-parameters with simulated results demonstrates that...
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