Intrinsically Switched Multiplexer Based Reconfigurable Filter MMIC

This paper describes the design and experimental results of a Gallium Arsenide (GaAs) 6-channel electronically reconfigurable filter bank MMIC suitable for RF filtering and frequency selective interference rejection. An intrinsically switched multiplexer (ISM) architecture is utilized to realize a 64 state reconfigurable filter bank. The MMIC includes directional integrated peak detectors to monitor signal levels entering and leaving the filter bank. Measured results for the in-band ISM state over a 4.0-8.5 GHz frequency range demonstrates 4.0 dB average insertion loss and 30dBm typical input IP3. Experimental results for the out-of-band ISM state indicates greater than 37 dB of rejection capability and 50dBm typical input IP3.