A CMOS current-mode companding integrator for application in continuous time analog filters is presented. It is a modified version of the Proportional Source Transconductances Integrator. The main improvements are increased compactness, larger first-order behavior bandwidth and manual calibration capability. The circuit has been designed in a CMOS 130 nm technology and analyzed through simulation, featuring: -20 dB/decade slope from 7 kHz to 80 MHz, 180 uW-static power and 3rd order intermodulation distortion lower than 40 dB for input sweep of +0.8 uA.