A Sallen and Key active filter using SiGe BiCMOS technology

In this paper, a 1.3 GHz Sallen and Key band pass filter, based on a voltage amplifier and designed with an original topology, is presented. This filter realized with a SiGe BiCMOS technology, showed a good agreement between simulation and measurement. In particular, the amplifier gain and the filter selectivity can be tuned. Q factors of up to 60 were measured.