A CMOS 1.3-1.7GHz Q-Enhanced LC Band-pass RF Filter with 1.5-67% Tunable Fractional Bandwidth

A tunable four stage active RF band-pass filter (BPF) adopting Q-enhanced technique is presented in this paper. The center frequency can be programmed from 1.3 to 1.7 GHz with 50 MHz resolution. The proposed BPF can also support a tunable signal passband from 25 to 1000 MHz with 25 MHz tuning step, equivalent to a 1.5-67% tunable fractional bandwidth when centering at 1.5 GHz. The RF BPF achieves 148.4 dB normalized dynamic range (DR). The chip is fabricated in a standard 65 nm CMOS process with 80 mA current consumption. To the authors' best knowledge, this RF BPF has demonstrated the widest fractional bandwidth programmability.