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A broadband power amplifier in a 250-nm InP HBT technology is presented, working at full <inline-formula> <tex-math notation="LaTeX">$H$ </tex-math></inline-formula>-band (220&#x2013;320 GHz). A cascode transistor is employed as a power cell to achieve high gain and power at <inline-formula> <tex-math notation="LaTeX">$H$ </tex-math></inline-formula>-band. Two-stage cascode power amplifier is designed with input and output impedance of not 50 but 25 <inline-formula> <tex-math notation="LaTeX">$\Omega $ </tex-math></inline-formula>, reducing the impedance transformation ratio and allowing the broadband matching networks. Two power-amplifier channels are power-combined using on-chip baluns which perform the impedance transformation from 25 to <inline-formula> <tex-math notation="LaTeX">$50~\Omega $ </tex-math></inline-formula>. The balun operation is based on the electromagnetic field conversion between coplanar waveguide and microstrip line. It does not rely on long transmission lines with frequency-dependent length, so that it occupies a very compact area and exhibits a broadband performance. It also enables power amplifiers to operate in the balanced mode, allowing the area reduction and stable operation. Substrate modes and in-band resonances in InP substrate, which seriously degrade circuit performance and limits bandwidth, are effectively suppressed by the reduced on-chip ground and balanced operation. The fabricated power amplifier shows a measured small-signal gain of 20.8 dB at 232 GHz with a 3-dB bandwidth larger than 51 GHz (20.8&#x0025;). Output power also exhibits a broadband performance of 8.0&#x00B1; 1.5 dBm from 220 to 295 GHz with power gain larger than 10.5 dB, corresponding to a large-signal 3-dB bandwidth larger than 75 GHz. This belongs to an excellent bandwidth in both small- and large-signal performance among the reported <inline-formula> <tex-math notation="LaTeX">$H$ </tex-math></inline-formula>-band power amplifiers.

H-Band Broadband Balanced Power Amplifier in 250-nm InP HBT Technology Using Impedance-Transforming Balun