Simplified P1dB estimation of active bandpass filters

In this letter, we propose a simple and accurate equation for the estimatio n of the l-dB power gain compression point (P1dB) in the active bandpass fi lter. The derivation of the equation is performed on the assumption of a no nlinear parallel conduction model of the active resonator used in the filte r. The P1dB's of two- and three-stage bandpass filters calculated front the proposed equation show very good agreement with the data obtained in a com mercially available microwave circuits simulator. A P1dB enhancement techni que based on this equation is also described.