Broadband amplifier with self adaptability to the electromagnetic status

It is well known the fact that, in reality, reception´s point electromagnetic status may change considerably over time and thus, the radio receiver must adapt its structure, resp., its characteristics, as to ensure optimal reception conditions of the useful signal. Generally, radio receiver´s adapting methods to the electromagnetic status are closely related to its dynamic range limits, as they determine its sensitivity and nonlinear properties. Radio receiver´s adaption involves adjusting transfer coefficients, disturbance thresholds, sensitivity, pass band etc., based on some well-established criteria that lead to automatic adjustment of the dynamic range limits. In this paper a broadband amplifier, which can automatically change its transfer coefficients, depending on input signal´s level (whilst no attenuators are used within its constructional stages), is proposed and assessed. Thus, during the followings, it is proven that the amplifier allows a high dynamic range of the input signal, while reducing the dynamic range of the output signal bellow the 1 dB compression point, recommending its usage either within a tuner or an active antenna, in MF, HF or VHF ranges.