X-band CMOS Lumped-Component Filter Synthesis Procedure with Capacitors Matching Capability

A novel CMOS lumped-component filter with on-chip calibration is proposed, using inline topology with resonant coupling between resonators. Calibration network is based on successive-approximation register (SAR) algorithm and free running cross-coupled oscillator and the design freedom given in the synthesis of the filter for choosing the capacitors values [1]. Variation in the 3-dB bandwidth and also transmission zeroes locations decreased from 1.5 GHz to a 100 MHz with center frequency of 10 GHz.