A high dynamic range 4th-order 4–8 GHz Q-enhanced LC band-pass filter with 2–25% tunable fractional bandwidth

This paper presents a fourth-order synthetic Q-enhanced LC band-pass filter (BPF) in 0.13 μm SiGe BiCMOS, where 4th-order BPF response has been synthesized by subtracting two 2nd-order BPF responses. Operating frequency of the filter is tunable from 4-8 GHz. Using a switched-varactor control for a high linearity, the filter achieves 150-166 dB · Hz normalized dynamic range (DR) with a tunable fractional bandwidth range of 2-25% at the center frequency of 6 GHz. The ultimate out-of-band rejection of the filter is > 65 dB and > 52 dB on the lower and upper side of the center frequency, respectively. The filter consumes 112-125 mW of DC power dissipation. The core chip size is 0.53×0.7 mm
²
.