Kim, M., M. Choi, G. Nam, W. Keum, and J.-S. Rieh. “Design of a 520-624-GHz Amplifier-Frequency-Doubler Chain in 250-Nm InP HBT Technology”. Journal of Integrated Circuits and Systems, Vol. 11, no. 1, Jan. 2025, doi:10.23075/jicas.2025.11.1.007.