An Active Bi-Directional SiGe DPDT Switch With Multi-Octave Bandwidth

摘要

This letter proposes a wideband active double-pole double-throw (DPDT) switch for wideband phased array antennas, which realizes multi-octave bandwidth with positive gain and 4-way switching operation using a bi-directional distributed amplifier technique. The measured gain is 2.0–6.0 dB and the input and output return losses are better than 9 dB from 2–22 GHz. The isolation is over 15 dB and the measured input P1dB is greater than 9.1 dBm and the output P1dB is greater than 7.8 dBm from 2–22 GHz. The chip size is , including pads. The switch consumes 10 mA from a 2.5 V supply. Almost identical RF performance is achieved in each of the 4-way switching operations due to a symmetric circuit topology and careful layout. To the authors' knowledge, this is the first demonstration of the active DPDT switch configuration.