High performance MMIC narrow band filter using tunable active inductors

摘要

An MMIC filter is presented which employs novel tunable active inductors, where both inductance and negative resistance can be varied. The 2 GHz filter achieved a mean insertion loss of 0.9 dB, passband ripple of /spl plusmn/0.7 dB, 3 dB bandwidth of 70 MHz and an excellent out-of-band rejection which exceeds 50 dB up to 18 GHz.