Abstract:
This paper presents a new design approach
which generates high-order electrically tunable HF ICcompatible
filters. The realized circuits are composed
only from CMOS linear transconductance elements and
grounded capacitors. We propose a new CMOS universal
multiple inputs biquad filter cell, which permits independent
electric controls of filter parameters. Several of
these biquad cells are incorporated in a low-sensitivity
coupled-biquad structure in order to realize an active
HF filter. This structure implements a node-voltage
simulation of an equivalent LC ladder passive filter. A
fifth-order lowpass filter is simulated with the end to
demonstrate the performances of CMOS linear transconductors
in the achievement of HF high-orders filters.