Abstract:A dual-band 90-degree SiGe HBT active phase shifter based on band-pass and band-stop designs using dual-band resonators is presented in this paper. The active phase shifter employs differential configuration and has band-pass and band-stop filters in the load circuit. By switching two output ports of the differential amplifier, 90-degree phase shifting has been realized at dual bands. The implemented dual-band active phase shifter using 0.35 micron SiGe HBT has achieved a gain of 9.3 dB and a phase shift of 95… Show more
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