Radio high frequency amplifier circuit

Radio high frequency amplifier circuit

Shown is an example of a frequency modulation (FM) radio high-frequency amplifier circuit . The high-frequency signal (about 100 MHz) received by the antenna
is amplified by this amplifier. This kind of amplifier has the characteristics of good high-frequency characteristics and relatively stable operation.
In this circuit, after the antenna receives the signal, it is tuned by the series resonant circuit and the LC parallel resonant circuit composed of LC and outputs the required
high-frequency signal. After passing through the coupling capacitor cl, it is sent to the emitter of the transistor and is amplified by the transistor 2SC2724. There is an LC resonant circuit in the collector output circuit
, which resonates with the high-frequency input signal and plays a frequency selection role.