High efficiency W-band power amplifiers using ring-shaped sub-quarter-wavelength power combining technique

We present W-band power amplifiers which are designed using the sub-quarter-wavelength transmission line balun in a ring-shaped configuration and fabricated in a 0.25 μm InP DHBT technology. Operating at 86GHz, a single-stage PA exhibits 20.86dBm saturated output power with 10.2dB peak power gain, a recored PAE of 35% and a record 3-dB bandwidth of 33GHz. A two-stage PA exhibits 22.75dBm saturated output power with 20.4dB peak power gain, a PAE of 32.8% and a 3-dB bandwidth of 16GHz.

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