Wide Tuning Range of A CMOS RF Bandpass Filter For Wireless Applications

A 2^ndorder RF bandpass filter with high-Q active inductor using low-voltage is presented. In the filter, a design technique for a tunable high-Q CMOS active inductor operating in the wide RF-band is described. Simulated performance is presented showing that the center frequency of filter using a 0.25-um CMOS process can be operated at the 1.60G∼2.45GHz frequency band under a 1.8V power supply and quality factor is adjusted from 30∼200 when fc≈2.45GHz.