A LOW-VOLTAGE, LOW-POWER CMOS 5TH-ORDER ELLIPTIC CM-C FILTER FOR BASEBAND MOBILE, WIRELESS COMMUNICATION

In this paper, the design and performance of a rail-to-rail low-voltag e CMOS fifth-order elliptic low-pass GMC filter for baseband mobile co mmunication are presented, The operational transconductance amplifier (OTA) used in this filter is a low-voltage rail-to-rail voltage-to-cur rent converter (V-I converter), in this V-I converter, an N-type V-T c onverter cell is connected in parallel with its counterpart, a P-type V-I converter een, to achieve common-mode (CM) rail-to-rail operation, Two maximum-current selecting circuits and an output current subtract ion circuit are utilized to generate constant-g(m) output currents for this OTA. This fifth-order elliptic low-pass GMC filter operates at a supply voltage of La V and has a cutoff frequency of 250 to 405 KHz. It provides up to 700 mVpp output with 1% total harmonic distortion (T HD), dissipates 2.48 mW at V-cm = 1.5 V, and occupies 1.62 in a 1.2 mu m technology.