ES246346A1 - A disposal of reception circuit. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A reception circuit arrangement comprising an intermediate frequency amplifier based on transistors operating in a common emitter arrangement, which follows a mixing stage (preferably a self-oscillating mixing stage) and is followed by a detector stage, said arrangement being characterized by the fact that the mixing stage is connected to the primary circuit, of relatively low quality factor, of an intermediate frequency input bandpass filter whose secondary circuit has a relatively high quality factor and comprises a ratio connection of reduced socket, socket that is connected to the base of the (first) intermediate frequency transistor; while the collector of the (last) intermediate frequency transistor is connected to a socket with a low tap ratio in the primary circuit, of a relatively high quality factor, of an intermediate frequency bandpass filter whose secondary circuit , which is connected to the detector, has a relatively low quality factor; and further stabilizing the working point of the intermediate frequency transistor (s) in a known manner by means of a collector resistance in conjunction with a collector-base resistor, which resistance preferably has values such that the voltage drop in the collector resistance corresponds approximately to half the supply voltage. (Machine-translation by Google Translate, not legally binding)