A 6 th order 1.6 to 3.2GHz tunable low-pass linear phase g m -C filter for fiber optic adaptive EDC receivers

A 6th order low-pass 1.6 to 3.2GHz g m -C filter for fiber optic adaptive EDC receivers cascades three Bi-Quads permitting reduction of group delay variation down to 10ps. Cut-off frequency is tuned by switching CMOS varactors polarity. THD is below −40dB at 0.9V pp-diff output. CTF is implemented in a 0.18µm SiGe process, it occupies 0.17mm 2 and consumes 0.3W from 3.3V supply.