Improvements in intermediate frequency amplifiers and detectors in transistorized radio receptors for the reception of modulated signals in amplitude and modulated frequency. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the amplifiers and intermediate frequency detectors in transistorized radio receivers for the reception of amplitude modulated and frequency modulated signals, characterized by substantially comprising two cascade amplifier steps, the second of which governs the modulated amplitude detector (AM), a detector for automatic sensitivity control in AM and a detector for frequency modulation (FM), and by the fact that the first step comprises a transistor mounted as an amplifier with a common emitter and having the collector connected directly to the base of the transistor of the second step, without interposition of selective circuits, and said transistor of the second step works in AM as amplifier with common collector and in FM as amplifier with common emitter, being connected to the transmitter the tuned transformer of the AM detector and connected to the collector the transformer corresponding to the FM detector. (Machine-translation by Google Translate, not legally binding)