A 275 GHz Active Vector-Sum Phase Shifter

作者：Quan C^*; Heo S; Urteaga M; Kim M

来源：IEEE Microwave and Wireless Components Letters, 2015, 25(2): 127-129.

DOI：10.1109/LMWC.2014.2382655

• InP HBT
• phase shifter
• terahertz IC
• variable-gain amplifier (VGA)

Terahertz vector-sum phase shifters capable of 360 degrees phase control over the frequency range of 240 to 310 GHz are presented. Because the impedance mismatch of the variable-gain amplifiers employed in the phase shifter determines the flatness of the offset phases, a new broadband VGA design with its input and output impedances unaffected by dc bias is introduced. The measured results on the phase shifter fabricated using 0.25 mu m InP HBT technology show incremental phase shifts of 45 degrees with an average RMS offset phase error of 3.6 degrees and insertion loss of -1 to -13 dB for eight basis dc bias states.

• 出版日期2015-2