Analysis and design of microwave linearized amplifiers using active feedback

Intermodulations distortion of active feedback amplifier systems has been analyzed using a simple method. Starting from the amplitude characteristic of both amplifiers-the main and the auxiliary-it is possible to calculate the intermodulation distortion of the complete system. Analytical results show that third-order intermodulation products can be considerably reduced when active feedback with correct amplitude and phase is used. Experimental measurements that confirm the theoretical analysis have been made on a one-stage bipolar transistor amplifier. >