A Gm-C filter using multiple-output linearized transconductors

A Gm-C filter using multiple-output transconductors suitable for reducing the chip area and power consumption is presented. The novel multiple-output transconductor is based on a translinear gain cell with a linearized input stage. Making good use of the linearized input stage, a simple common-mode feedback is also proposed for this multiple-output transconductor. Using the proposed technique, a 5th-order lowpass filter with two transmission zeros was designed and fabricated as a main part of a lowpass channel selection filter for UMTS receivers. The proposed technique uses the roughly half the number of transconductors compared with the conventional active ladder filter design.